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Speaker 1: Hey, welcome to Sign Stuff, a production of iHeartRadio. My

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Speaker 1: name is Hoorge Champ, and today on the program, we

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Speaker 1: are tackling a question that has poured cold water on

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Speaker 1: the fund of countless children here in the US and

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Speaker 1: across the world. Do you have to wait thirty minutes

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Speaker 1: after eating before you can go swimming? We've all been there.

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Speaker 1: It's a hot day and you're eager to get back

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Speaker 1: into the cool and inviting pool, but you've just had

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Speaker 1: lunch and some adult is telling you you're supposed to

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Speaker 1: just sit there and do nothing for thirty minutes before

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Speaker 1: you can rejoin your friends in the water. Now, as

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Speaker 1: I'll mentioned in a minute, this is a very personal

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Speaker 1: question for me, and so it was very eager to

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Speaker 1: put this advice to the float test to see if

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Speaker 1: it sinks or swims. We're going to be doing that

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Speaker 1: by talking to a medical doctor and also a physiologist

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Speaker 1: will take us on a deep dive into the topic

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Speaker 1: of digestion and exercise. So put your floaties on, because

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Speaker 1: we are going to the deep end of science to

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Speaker 1: find out do you really have to wait thirty minutes

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Speaker 1: after eating to go swimming? Don't worry if anything happens.

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Speaker 1: I know CPR, which in this case stands for Certified Podcasts, Researching, Enjoying. Okay,

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Speaker 1: so the first thing I did was to try to

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Speaker 1: figure out where this piece of advice about eating and

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Speaker 1: swimming came from, but it seems nobody could figure it out.

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Speaker 1: The earliest mentioned that anyone can find about this is

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Speaker 1: in the Boy Scout Manual from nineteen oh eight. A

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Speaker 1: lot of people don't know this, but the boy Scout

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Speaker 1: movement actually started in England, who was started by a

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Speaker 1: British Army general called Robert Baden Powell, who fought in

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Speaker 1: a bunch of wars in Africa. So when he came

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Speaker 1: back he wrote a book called Scouting for Boys, which,

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Speaker 1: according to the Telegraph newspaper, is one of the top

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Speaker 1: four best selling books of the twentieth century. Apparently, the

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Speaker 1: only books that have sold more copies are the Bible,

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Speaker 1: the Quran, and the Thoughts of Chairman mal Sittung. This book,

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Speaker 1: Scouting for Boys contains advice, of course about scouting, like

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Speaker 1: how to start a campfire or how to deal with

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Speaker 1: the stink bite, but it also has some weird pieces

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Speaker 1: of advice, like the rule that you shouldn't trust men

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Speaker 1: with waxed mustaches. And then in a section called keep

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Speaker 1: yourself Clean, it's a little bit of advice. It says, quote,

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Speaker 1: never bathed in deep water very soon after a meal.

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Speaker 1: It is very likely to cause cramp, which doubles you

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Speaker 1: up and so you get drowned. End quote. Now nobody

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Speaker 1: can tell if this is the actual origin of that advice,

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Speaker 1: but after that it definitely seems to have seeped into

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Speaker 1: the culture. But is it actually true. To get to

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Speaker 1: the bottom of this, I decided to call doctor Matthew Badgett,

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Speaker 1: who is a doctor of internal medicine and pediatric primary

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Speaker 1: care at the Cleveland Clinic. Now, he's spoken about this

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Speaker 1: before on the internet, and he was also a high

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Speaker 1: school competitive swimmer, so I thought he was the perfect

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Speaker 1: person to call. So here's the first part of my

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Speaker 1: chat with doctor Matthew badget All Right, well, thank you

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Speaker 1: doctor badget for joining us today.

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Speaker 2: Yeah, thank you for having me excited to be here.

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Speaker 1: Okay, so today we're tackling a very important question that

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Speaker 1: a lot of kids are asking and have been asking

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Speaker 1: for decades, and that is can you go swimming after eating?

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Speaker 1: Or do you have to wait thirty minutes, as most

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Speaker 1: parents would say. And I should just tell you this

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Speaker 1: is a bit of a personal question for me. So

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Speaker 1: I grew up in Panama. I was born and raised there,

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Speaker 1: and I spent a lot of time in swimming pools

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Speaker 1: because my favorite aunt would take us swimming, and she's

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Speaker 1: a doctor, and she would always tell us that we

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Speaker 1: had to wait thirty minutes after eating before we could

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Speaker 1: go swimming, and it was the worst part of the day.

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Speaker 1: You know, you're excited, you want to go into the

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Speaker 1: swim pool, but you can. You just have to sit

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Speaker 1: there and be totally bored for thirty minutes. So basically,

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Speaker 1: doctor Badget was my aunt lying to me.

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Speaker 2: I don't think she was lying to you because she

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Speaker 2: believed she was telling the truth. But I do think

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Speaker 2: she's wrong, right, you know, from my own history, I

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Speaker 2: remember when I was at the pool, i'd lie to

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Speaker 2: my mom about when I last.

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Speaker 1: Ate so I could go back, incause I'd have thought

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Speaker 1: of that before.

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Speaker 2: Yeah, but you know, this is a long standing thing

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Speaker 2: where it's growing up. This made no sense to me

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Speaker 2: because you know, like, well, you can't eat and then

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Speaker 2: go swimming. But you go to a soccer game and

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Speaker 2: there's like oranges and caprice suns everywhere, and they're like,

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Speaker 2: if you don't eat this orange, you're going to get

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Speaker 2: a cramp. But then they say that if you go

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Speaker 2: swimming and if you do eat, you'll get a cramp.

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Speaker 2: And I'm like, being my like opinionated self at ten,

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Speaker 2: I was like, this is stupid, right, Like this makes

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Speaker 2: no sense because they're telling you some physical activities require

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Speaker 2: eating to prevent cramps, while they're telling you that other

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Speaker 2: physical activities you need to not eat.

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Speaker 1: To prevent that. Wait, so you're ten years old and

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Speaker 1: you've reasoned this, like you figured this out?

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Speaker 2: Yeah, yeah, I don't know. Maybe I always had a

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Speaker 2: strong barometer for hypocrisy, but I always thought this rules

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Speaker 2: really made no sense to me. I remember this is

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Speaker 2: I would have been at the end of high school.

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Speaker 2: But when like Michael Phelps was really big and they

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Speaker 2: really showed what he would eat.

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Speaker 1: Right, like a billion calories, But.

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Speaker 2: It wasn't just a billion calories. You know, his pre

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Speaker 2: morning swim meet meal was like eggs, toast and four shakes.

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Speaker 2: Four shakes but not one or two. Know, he had

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Speaker 2: four energy eatings.

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Speaker 1: Right, did do you think he waited thirty minutes or

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Speaker 1: do you think he ate those four shakes and jumped

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Speaker 1: into the pool.

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Speaker 2: Well, I mean he probably waited a little bit, but

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Speaker 2: like he had a ob scene him out. But if

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Speaker 2: you ask, like what people are doing before swimmings or

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Speaker 2: what they're doing in before morning practices, I could physically

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Speaker 2: tell a difference if I had two pieces of toast

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Speaker 2: and then went and swam an hour at five thirty

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Speaker 2: six am in high school versus if I didn't eat it,

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Speaker 2: I would be dragging like that workout would definitely feel

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Speaker 2: you know, you.

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Speaker 1: Would feel the difference.

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Speaker 2: Yeah, indeed, you know, like other sports, I think this

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Speaker 2: is more commonly understood. It's you go to a five

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Speaker 2: k race nowadays, right, and they're handing out snacks everywhere, right, right,

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Speaker 2: So it's well understood that we need to be doing

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Speaker 2: these we need to be eating. And there's better evidence

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Speaker 2: for running and bicycling because I think this's is easier

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Speaker 2: to control for studies that giving carbohydrates before an exercise

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Speaker 2: improves endurance, improves energy, and prove speed and strength. Now,

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Speaker 2: of course, most people that are going in the pool

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Speaker 2: don't necessarily need optimal physical performance.

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Speaker 1: I know, I know, But you know, if you're playing

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Speaker 1: marco polo. Those are high stakes.

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Speaker 2: You know that's true, though, I mean marco polo is

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Speaker 2: more about strategy and holding your breath underwater and other

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Speaker 2: other nuances then.

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Speaker 1: Right, right, other performance issues.

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Speaker 2: Yeah, But the point is that we know that for

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Speaker 2: optional physical performance we need some amount of carbohydrates or calories.

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Speaker 2: You know, if you're doing a really long physical activity

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Speaker 2: in the pool, like if you're doing like a couple

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Speaker 2: of mile swim, like, it's probably reasonable to stop after

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Speaker 2: half an hour, take like a goo or a piece

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Speaker 2: of fruit and eat it and then keep swimming if

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Speaker 2: you really want to be physically optimal.

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Speaker 1: In which case you're eating into the exercise.

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Speaker 2: Yeah. If people are doing half marathons, they're taking fluids

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Speaker 2: and carbohydrates during the race. If they're doing marathons, they're

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Speaker 2: doing that, they're doing one hundred mile bike rides. They're

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Speaker 2: doing these things, right And once again, we're telling these

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Speaker 2: kids to eat oranges during the soccer game, right right,

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Speaker 2: because we think it helps their physical performances and prevents cramps,

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Speaker 2: right right, right, So we're already telling the kids to

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Speaker 2: do these things.

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Speaker 1: Uhuh, just not in the pool, Just not in the pool.

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Speaker 2: And that that really pissed me off.

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Speaker 1: When I was like, who would you direct this anger at?

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Speaker 1: I guess the adult who was telling you.

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Speaker 2: I think I argue with my mom about it once.

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Speaker 2: She wasn't very interested, but she also didn't feel strongly

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Speaker 2: enough to stop me from eating and swimming, So like.

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Speaker 1: I see, So, doctor Badgett definitely has some strong opinions

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Speaker 1: about this, but his general point is that on the

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Speaker 1: one hand, we're telling kids that they should eat some

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Speaker 1: food before they exercise, like, for example, they should eat

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Speaker 1: some orange slices or drink some juice before they play soccer.

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Speaker 1: And in some sports you actually want to be eating

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Speaker 1: during the exercise, like if you're doing a really long

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Speaker 1: run or really long swim. But at the same time,

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Speaker 1: we seem to be telling kids not to eat anything

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Speaker 1: at all right before going swimming because it might cost cramps.

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Speaker 1: Of course, you're probably thinking, well, maybe swimming is different

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Speaker 1: than playing soccer, and that's what I thought too, So

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Speaker 1: I asked them directly if swimming and eating can be

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Speaker 1: a dangerous combination. This is what he said, but I

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Speaker 1: just want to double check. So in your medical school

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Speaker 1: education as a pediotician, when you go to School for Pediatrics. Yeah,

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Speaker 1: they never mentioned this.

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Speaker 2: No, I never heard it come up for or against. Right,

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Speaker 2: I was never taught that we need to The number

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Speaker 2: one thing that I got about pools in pediatric training

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Speaker 2: is fences, fences, fences, fences, fences and fences, which is,

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Speaker 2: if you have a pull at your house, always put

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Speaker 2: a fence up to reduce the chance that your child

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Speaker 2: drowns in it. Most of the training, you know it

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Speaker 2: is around, and there's evidence of that, right, putting a

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Speaker 2: fence up reduces depths, so it's recommended.

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Speaker 1: But in your years and years of being a pediatrician,

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Speaker 1: and nobody has ever come in or no cases have

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Speaker 1: come through your office of parents saying something out of

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Speaker 1: either kid because they swim too soon after eating.

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Speaker 2: No, And have I told patients that it's okay to

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Speaker 2: eat during swieing. Not often, because it doesn't come up.

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Speaker 2: We have so many things we want to talk about

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Speaker 2: in a limited visit and so many issues. Now. It's

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Speaker 2: actually interesting you bring this up because I was at

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Speaker 2: talking with some residents when I got interviewed for this

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Speaker 2: article a couple of months ago, and a good number

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Speaker 2: of them are for medical grads.

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Speaker 1: You mean foreign like from another country.

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Speaker 2: And so the American ones were like, yeah, no, you

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Speaker 2: don't wait to swim, and all the foreign medical grads

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Speaker 2: they're all from Europe or the Middle East, They're like,

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Speaker 2: we don't know this rule.

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Speaker 1: They don't even have this rule.

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Speaker 2: So so so like how universal is it? Right? Like

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Speaker 2: you know where I couldn't find where culturally got started.

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Speaker 1: Right, Well, it's interesting you said that there's this push

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Speaker 1: for evidence based medicine. Yeah, you would think this is

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Speaker 1: maybe high on the priority list of things to figure

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Speaker 1: out the answer to.

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Speaker 2: I mean not really, because it's a I mean it's

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Speaker 2: a it's probably not very harmful, right, Waiting to swim

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Speaker 2: is not harming people. Now, I'm sure you were very

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Speaker 2: upset by it, right, like when you're younger and that

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Speaker 2: you had to wait. It's not you know, I think

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Speaker 2: very rarely are we actually putting people in danger by

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Speaker 2: doing this, because you know, it's a situation where like, yeah,

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Speaker 2: kids might have to not get as much swimming time in,

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Speaker 2: but is that actually harmful? There's so there's a thousand

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Speaker 2: and one.

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Speaker 1: Issues, right, not harming anyone, and in fact, it's maybe

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Speaker 1: just teaching kids to sit still for thirty.

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Speaker 2: Minutes which might have a benefit. Right.

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Speaker 1: Okay, So to recap my conversation with doctor Badget, medical

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Speaker 1: doctors are not taught at eating before swimming is dangerous,

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Speaker 1: and in fact, in lots of other sports you actually

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Speaker 1: eat while you're doing the exercise. Now, is this based

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Speaker 1: on heart science? Well, like doctor Badget said, this is

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Speaker 1: not a high priority issue for the medical community. But

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Speaker 1: they did manage to find some scientific studies that look

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Speaker 1: at this question. For some reason, in the nineteen sixties,

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Speaker 1: a whole bunch of scientists got really interested in the subject,

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Speaker 1: and so there was a small flurry of experiments that

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Speaker 1: were done, and they all sort of go something like this.

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Speaker 1: The scientists grabbed a bunch of people, usually college students

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Speaker 1: because these were all mostly done at universities, and then

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Speaker 1: they had the subject to a bunch of laps on

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Speaker 1: a swimming pool. In one study, they would have the

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Speaker 1: college student swim two hundred yards freestyle, and another they

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Speaker 1: would swim one hundred yards, and then another they would

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Speaker 1: swim a whole mile. Now, the scientists would also have

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Speaker 1: the swimmers eat a small meal at different times before

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Speaker 1: they went swimming, So some of the swimmers would eat

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Speaker 1: a small meal three hours before they went swimming. Some

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Speaker 1: of the swimmers would eat a meal one and a

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Speaker 1: half hours before swimming, and some of the swimmers would

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Speaker 1: eat a small meal half an hour before going swimming.

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Speaker 1: And then the scientists would see how well the swimmers swam,

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Speaker 1: Did they have the same times, did they report feeling

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Speaker 1: any struggle or nausea or cramps, did any of them drown?

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Speaker 1: And across the board pretty much, they all found the

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Speaker 1: same thing. They found that how much time passes between

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Speaker 1: eating a meal and swimming has no effect on how

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Speaker 1: well the swimmers swam. They all swam at the same speed. Basically,

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Speaker 1: the students who ate a meal half an hour before

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Speaker 1: swimming swam just as well as the students who ate

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Speaker 1: three hours before swimming. And also nobody drowned. In fact,

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Speaker 1: there were no reported cases in the studies of anyone

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Speaker 1: even having cramps. But still it seems like the myth persisted.

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Speaker 1: I mean, I was born way after the nineteen sixties,

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Speaker 1: and my aunt was still giving that advice. So it

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Speaker 1: got to the point where even the Red Cross had

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Speaker 1: to intervene. So in twenty eleven, the American Red Cross

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Speaker 1: Scientific Advisory Committee issued a special scientific review on the

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Speaker 1: issue of eating before swimming, which they published in the

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Speaker 1: International Journal of Aquatic Research and Education. It reads, quote

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Speaker 1: this review services a scholarly literature to investigate whether there

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Speaker 1: is any correlation between eating and fatal or non fatal

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Speaker 1: drowning events, and to establish whether it is safe to

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Speaker 1: swim after eating end quote. At the end, they concluded,

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Speaker 1: quote there are no reported cases of eating before swimming

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Speaker 1: costing or contributing to fatal or non fatal drowning in

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Speaker 1: any of the literature search. Currently available information suggests that

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Speaker 1: eating before swimming is not a contributing risk for drowning

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Speaker 1: and can be dismissed as a myth. Food intake restrictions

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Speaker 1: prior to swimming are unnecessary. End quote. That's right, kits everywhere,

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Speaker 1: you can eat whatever you want before going swimming, the

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Speaker 1: American Red Cross says, So, so question answered, or is

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Speaker 1: it there is something that was found in those swimming

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Speaker 1: studies that was not covered in the Red Cross report.

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Speaker 1: So when we come back, we're going to look into that,

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Speaker 1: and also we're going to tackle the general issue of

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Speaker 1: digestion and swimming. What's actually happening to that food you eat?

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Speaker 1: How does it affect your body, you're listening to sign stuff,

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Speaker 1: welcome back to sigence stuff. So to recap. Even the

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Speaker 1: Red Cross has concluded you don't have to wait thirty

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Speaker 1: minutes after eating before you can go swimming. There's no

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Speaker 1: evidence that it leads to any danger. But there is

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Speaker 1: one thing that several of the swimming studies found. They

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Speaker 1: found that the swimmers who went swimming thirty minutes or

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Speaker 1: less reported a significant amount of discomfort and nausea. It

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Speaker 1: was not a good swimming experience for them. And I

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Speaker 1: think that's something that maybe some of us can relate to,

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Speaker 1: which is going swimming after a meal and then feeling

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Speaker 1: like you're going to throw up. So now the question

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Speaker 1: is what's going on there, what is it about swimming

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Speaker 1: and eating that causes that discomfort, and how is it

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Speaker 1: tied to the thirty minute mark? And so I called

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Speaker 1: an expert. Professor. Stephen Ives is an associate professor of

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Speaker 1: Health and Human Physiological Sciences at Skidmore College, and he

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Speaker 1: studies how our bodies respond to exercise and how we

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Speaker 1: adapt to exercise long term. So I told him about

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Speaker 1: my experiences with my aunt, and then I asked him

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Speaker 1: to break it all down for us. So here's my

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Speaker 1: chat with Professor Steven Ives. Thanks so much for joining

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Speaker 1: us here today. What are your thoughts on the question

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Speaker 1: of whether, one sh you'd wait thirty minutes after eating

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Speaker 1: before going swimming.

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Speaker 3: Yeah, that's a great question, and I think your scenario

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Speaker 3: is one we can all relate to. I also rope

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Speaker 3: roundwater pools and lakes, etc. And I had that same

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Speaker 3: blore given to me as well. And now it's the

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Speaker 3: same thing, but with sunscreen. You gotta put your sun

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Speaker 3: screen on, then you got to wait until that track.

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Speaker 3: So we've traded one for the other.

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Speaker 1: I suppose in thirty years our kid's going to be

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Speaker 1: complaining about us and that advice perhaps perhaps.

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Speaker 3: So the interesting thing about this is, you know, when

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Speaker 3: you look into it, there's no real evidence to suggest

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Speaker 3: that there's any real threat or danger. So I don't

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Speaker 3: think there's a cute risk there. That said, we can

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Speaker 3: talk a little bit more about is it wise to

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Speaker 3: eat before swimming?

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Speaker 1: I see, so it's not a safety issue, but it

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Speaker 1: does maybe affect your swimming experience.

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Speaker 3: Yeah, I think it's more of a comfort issue or

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Speaker 3: a discomfort issue that we're more likely to encounter than

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Speaker 3: a safety issue. So there's two main categories that I

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Speaker 3: would talk about with regards to this question. That is

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Speaker 3: the process of digestion and the swimming. So we can

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Speaker 3: use a technique clinically that's called gastric emptying studies, and

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Speaker 3: that allows us to assess how long it takes to

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Speaker 3: begin the process of digestion in the stomach for that

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Speaker 3: food to leave the stomach.

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Speaker 1: Maybe steak is a step back. So when I eat

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Speaker 1: something I quew, it goes down my throat lands in

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Speaker 1: my stomach. What happens to that food afterwards.

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Speaker 3: Well, it actually starts before that. So you as soon

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Speaker 3: as you see that food or you smell that food,

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Speaker 3: the whole process of digestion starts right So you smell

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Speaker 3: the food, you see the food, you begin to salivate,

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Speaker 3: and that's really the first step in the digestive process.

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Speaker 3: The chewing helps start to break down the food, but

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Speaker 3: there's also enzymes in saliva that help to start the

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Speaker 3: digestive process and breaking down our starches, our larger carbohydrate molecules.

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Speaker 3: That goes down the esophagus and that food gets sensed

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Speaker 3: by the esophagus and that triggers this rhythmic muscle contraction.

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Speaker 3: That moves the food down into the stomach, and the

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Speaker 3: stomach actually begins to pulverize it a little bit. We

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Speaker 3: don't think of the stomach as doing any mechanical digestion,

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Speaker 3: but it.

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Speaker 1: Does what My stomach will actually start contracting and massaging

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Speaker 1: the food.

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Speaker 3: It is a muscular organ, so it'll start to sort

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Speaker 3: of grind that food down a bit more. And interestingly enough,

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Speaker 3: it starts to analyze it, right. So you know, we

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Speaker 3: think about our dishwashers as being smart detecting how much

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Speaker 3: dirt is on your dishes. The stomach is a little

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Speaker 3: bit the same. Starts to detect the composition of the

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Speaker 3: meal and how big the meal is. The meal will

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Speaker 3: stretch the stomach and depending on the stretch, that tells

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Speaker 3: you about the size of the meal. But it's also

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Speaker 3: looking at the composition and then that's going to dictate

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Speaker 3: some of the digestive response.

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Speaker 1: How does it analyze it? Does it have like sensors?

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Speaker 3: Yep. Wherever you have a response, you have to have

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Speaker 3: a sensor and an integrator, right, So there's something that's

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Speaker 3: sensing the composition and the meal, and there's various so

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Speaker 3: it's analyzing the content of the meal, and then that

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Speaker 3: information gets integrated by the nervous system and then we

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Speaker 3: generate a response which will help dictate the hormonal response,

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Speaker 3: the enzyme response, the stomach acid response.

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Speaker 1: Whoa. So then the food lands in there and it

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Speaker 1: sits in the stomach for a while, or it depends

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Speaker 1: on what's in it.

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Speaker 3: It depends, That's what I'm saying it. So the size

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Speaker 3: of the meal matters. The contents of the meal matters.

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Speaker 3: So the larger the meal, it could alter the rate

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Speaker 3: of digestion. The more calorie dense it is, the longer

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Speaker 3: it's going to take to digest that Or if it

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Speaker 3: has more fiber, that could take longer to digest that meal.

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Speaker 3: So then after it leaves the stomach, it enters into

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Speaker 3: the small intestine.

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Speaker 1: Oh, is there like a little door to the lower

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Speaker 1: testine that opens little by little or does it lead

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Speaker 1: the food into it or how does it move the food?

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Speaker 3: Again, it depends. If it's more liquid, it's a more

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Speaker 3: fluid process, you know, no pun intented it's it's going

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Speaker 3: to be more of a streaming type of effect. But

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Speaker 3: there is a gatekeeper at the top and bottom of

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00:19:13,119 --> 00:19:16,320
Speaker 3: the stomach. Right, So we have these what we call sphincters,

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Speaker 3: these muscular parts that help close off or allow both

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Speaker 3: the entrance to the stomach and the exits to the

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Speaker 3: stomach to open and close. And we hope those work

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Speaker 3: well as they're supposed to. And so when people talk

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Speaker 3: about indigestion, that's the upper sphincter of the stomach perhaps

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Speaker 3: being dysfunctional and stomach acid can leak back up into

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Speaker 3: the esophagus and cause that pain in the chest.

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Speaker 1: Okay, the food sits in my stomach, at some point

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Speaker 1: it gets through to the intestine. How fast is that process?

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00:19:49,720 --> 00:19:53,760
Speaker 3: So we can use a technique clinically that's called gastric

401
00:19:54,200 --> 00:19:59,240
Speaker 3: emptying studies, and that allows us to assess how long

402
00:19:59,280 --> 00:20:03,119
Speaker 3: it takes to begin the process of digestion in the

403
00:20:03,200 --> 00:20:07,080
Speaker 3: stomach for that food to leave the stomach. They use

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00:20:07,920 --> 00:20:11,360
Speaker 3: a meal, but the meal I think is usually egg

405
00:20:11,400 --> 00:20:15,440
Speaker 3: whites and barium chloride or something like that, so it's

406
00:20:15,440 --> 00:20:18,480
Speaker 3: a radio labeled substance, so it's not a typical meal.

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Speaker 1: Wait, radio labeled like it's radioactive.

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00:20:22,119 --> 00:20:27,080
Speaker 3: Even with that standardized meal, seventy percent is still in

409
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Speaker 3: the stomach after thirty minutes.

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Speaker 1: So meaning that after thirty minutes seventy percent of the

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Speaker 1: food you eat is still in your stomach.

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Speaker 3: From a gastric emptying or food exiting the stomach as

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00:20:39,640 --> 00:20:42,480
Speaker 3: an indicator of digestion. You know, we still have a

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Speaker 3: long way to go.

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Speaker 1: So there is something to the thirty minute mark.

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Speaker 3: Perhaps, but there's still a lot of food to be digested.

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Speaker 3: So I guess that would be an argument against thirty minutes.

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Speaker 3: I ice right, Well, depending on whether you're an optimist

419
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Speaker 3: or a pestimist, either you're you know, twenty five percent

420
00:20:59,080 --> 00:21:04,360
Speaker 3: there or twenty five percent left to go. Yeah, there

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00:21:04,400 --> 00:21:04,640
Speaker 3: you go.

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00:21:04,840 --> 00:21:06,680
Speaker 1: Okay, so then it goes in my intestine and then

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Speaker 1: and then what happened?

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Speaker 3: So in the small intestine, that's where at least the

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00:21:11,400 --> 00:21:15,600
Speaker 3: beginning part of the small intestine, we have bile that's introduced,

426
00:21:15,800 --> 00:21:19,640
Speaker 3: and that's where we're starting to break down the fats

427
00:21:19,640 --> 00:21:22,719
Speaker 3: into smaller molecules so then we can chop them up

428
00:21:22,720 --> 00:21:26,080
Speaker 3: a little bit more for energy as well. So the

429
00:21:26,160 --> 00:21:29,880
Speaker 3: small intestine is mostly the further breakdown of our macro

430
00:21:30,040 --> 00:21:34,719
Speaker 3: nutrients and starting to extract those nutrients that is, the fats,

431
00:21:34,760 --> 00:21:39,440
Speaker 3: the carbohydrates, the proteins, but also the vitamins, the minerals,

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00:21:39,600 --> 00:21:43,840
Speaker 3: et cetera. So then after that we transition into the

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Speaker 3: large intestine. There is some extraction of water and nutrients.

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Speaker 1: And then it all turns to well, i'd want to

435
00:21:51,720 --> 00:21:56,840
Speaker 1: say it P word. I was gonna say the S word,

436
00:21:56,880 --> 00:21:59,400
Speaker 1: but uh oh yeah, maybe we'll stick with the P word.

437
00:22:01,040 --> 00:22:04,320
Speaker 1: So that's a broad overview of digestion. And what's kind

438
00:22:04,359 --> 00:22:08,200
Speaker 1: of interesting there is the idea that your stomach actually

439
00:22:08,440 --> 00:22:11,080
Speaker 1: senses what you eat and then it adjusts how it's

440
00:22:11,080 --> 00:22:13,560
Speaker 1: going to digest that food and how long it's going

441
00:22:13,640 --> 00:22:16,080
Speaker 1: to take. And then when it comes to swimming, it

442
00:22:16,160 --> 00:22:19,879
Speaker 1: turns out that your digestion also depends on the exercise

443
00:22:19,920 --> 00:22:21,800
Speaker 1: that you're doing, but not in a way that I

444
00:22:21,840 --> 00:22:24,680
Speaker 1: think most of us understand it. So I asked professor

445
00:22:24,760 --> 00:22:29,200
Speaker 1: iis how swimming affects your digestion? Here's what he said,

446
00:22:30,320 --> 00:22:32,680
Speaker 1: all right, So that's what happens to your food when

447
00:22:32,680 --> 00:22:35,240
Speaker 1: you eat it. That's super interesting. And you said the

448
00:22:35,400 --> 00:22:38,160
Speaker 1: other part of it was the exercise, the swimming.

449
00:22:38,760 --> 00:22:42,919
Speaker 3: Yeah, so then that's the second part, right, So not

450
00:22:43,000 --> 00:22:46,960
Speaker 3: all swimming or exercises created equal, and perhaps that's obvious,

451
00:22:47,000 --> 00:22:49,120
Speaker 3: but you know, jumping off the diving board and doing

452
00:22:49,119 --> 00:22:52,280
Speaker 3: the doggy paddle to the ladder to go out and

453
00:22:52,320 --> 00:22:56,320
Speaker 3: do your next jump. That's one thing. But getting ready

454
00:22:56,359 --> 00:22:58,840
Speaker 3: to do a couple thousand yards meters in a pool

455
00:22:59,480 --> 00:23:05,400
Speaker 3: or sprint interval set for some hardcore swim training, those

456
00:23:05,440 --> 00:23:11,200
Speaker 3: are very different things. So interestingly, when we think about activity,

457
00:23:11,240 --> 00:23:14,080
Speaker 3: we could think about as light intensity, moderate intensity, and

458
00:23:14,200 --> 00:23:19,159
Speaker 3: high intensity, and the light intensity actually can aid in

459
00:23:19,240 --> 00:23:22,800
Speaker 3: digestion and likely speeds up gastric emptying.

460
00:23:23,920 --> 00:23:28,000
Speaker 1: Is it like light exercise, like going for a walk exactly?

461
00:23:28,040 --> 00:23:30,520
Speaker 3: And that's actually been in the press a lot lately,

462
00:23:30,600 --> 00:23:34,920
Speaker 3: that after dinner walk has been a popular thing of late.

463
00:23:35,160 --> 00:23:37,560
Speaker 3: And it's not a new thing, that's for sure, but

464
00:23:38,080 --> 00:23:41,760
Speaker 3: that's been popularized because it can aid in digestion, give

465
00:23:41,760 --> 00:23:45,000
Speaker 3: you a better feeling it particularly if you overeat, because

466
00:23:45,040 --> 00:23:47,600
Speaker 3: it's going to facilitate that gastric emptying.

467
00:23:48,520 --> 00:23:51,440
Speaker 1: Yeah, I've been hearing that a lot. So what's going

468
00:23:51,440 --> 00:23:54,200
Speaker 1: on there? Why is going for a walk helping you digest?

469
00:23:54,760 --> 00:23:57,520
Speaker 3: Well, that one's hard to figure out. I think we're

470
00:23:57,520 --> 00:23:59,679
Speaker 3: still trying to figure that out. Because the way we

471
00:23:59,720 --> 00:24:03,119
Speaker 3: tip do these studies is clinically. They would do the

472
00:24:03,119 --> 00:24:06,680
Speaker 3: barium studies and so then you're doing lots of imaging.

473
00:24:06,880 --> 00:24:09,879
Speaker 3: So I think it would be almost impossible to do

474
00:24:09,920 --> 00:24:13,399
Speaker 3: those studies while exercising, so you can do it before

475
00:24:13,600 --> 00:24:16,280
Speaker 3: and see what happens at the end of the day.

476
00:24:17,000 --> 00:24:21,280
Speaker 3: Being able to exercise and move is a fight or flight, right,

477
00:24:21,520 --> 00:24:27,240
Speaker 3: So light physical activity is likely to help us maintain

478
00:24:27,359 --> 00:24:30,720
Speaker 3: an ability to fight or flight. It's going to aid

479
00:24:30,720 --> 00:24:36,000
Speaker 3: in digestion, facilitate the mobilization of the nutrients that are

480
00:24:36,040 --> 00:24:37,439
Speaker 3: being digested.

481
00:24:37,160 --> 00:24:40,719
Speaker 1: Meaning your body is trying to keep itself ready in

482
00:24:40,760 --> 00:24:43,200
Speaker 1: case it needs to run from a line or fight

483
00:24:43,240 --> 00:24:44,000
Speaker 1: a hyena.

484
00:24:44,280 --> 00:24:48,000
Speaker 3: Yeah, it probably comes down to blood flow, which we'll

485
00:24:48,000 --> 00:24:50,600
Speaker 3: have to come back to that in a moment. But okay,

486
00:24:50,920 --> 00:24:54,560
Speaker 3: let's contrast that light physical activity with a high intensity.

487
00:24:54,760 --> 00:24:57,920
Speaker 3: So if we think about you know, maximal sprints down

488
00:24:58,000 --> 00:25:01,119
Speaker 3: the pool, or thinking about being in the ocean or

489
00:25:01,119 --> 00:25:04,439
Speaker 3: a surfer paddling hard out to that wave, that's a

490
00:25:04,520 --> 00:25:07,359
Speaker 3: very different situation in the sense that we need to

491
00:25:07,359 --> 00:25:11,360
Speaker 3: think about the blood flow that's going around the body

492
00:25:11,520 --> 00:25:15,440
Speaker 3: and how it gets distributed. So at rest, we think

493
00:25:15,440 --> 00:25:17,920
Speaker 3: about cardiac output, that is, the blood that's pumped out

494
00:25:17,920 --> 00:25:21,560
Speaker 3: by the heart per minute, and the relative percentages that

495
00:25:21,680 --> 00:25:25,520
Speaker 3: is distributed across all your organs and the tissues. It's

496
00:25:25,560 --> 00:25:28,480
Speaker 3: pretty fair. Let's just say that. So your brain's getting

497
00:25:28,480 --> 00:25:31,000
Speaker 3: what it's needed, the heart's getting what it needs, the

498
00:25:31,080 --> 00:25:34,800
Speaker 3: muscles are getting some, the gut is getting what it needs.

499
00:25:35,040 --> 00:25:37,879
Speaker 3: Maybe as much as twenty five percent of the blood

500
00:25:37,880 --> 00:25:39,800
Speaker 3: that's pumped out by the heart per minute could be

501
00:25:39,840 --> 00:25:40,520
Speaker 3: going to the.

502
00:25:40,520 --> 00:25:42,720
Speaker 1: Gut for digestion, I think.

503
00:25:43,359 --> 00:25:47,439
Speaker 3: But when we start exercising, our cardiac output, or the

504
00:25:47,480 --> 00:25:49,639
Speaker 3: blood that's pumped out by the heart per minute, you

505
00:25:49,840 --> 00:25:53,119
Speaker 3: can quintuple, right, So we're going from maybe five leaders

506
00:25:53,119 --> 00:25:56,360
Speaker 3: per minute that's leaving the heart to twenty five leaders

507
00:25:56,400 --> 00:25:59,800
Speaker 3: per minute during exercise, and that'd be during a sort

508
00:25:59,800 --> 00:26:01,439
Speaker 3: of high intensity exercise.

509
00:26:01,840 --> 00:26:04,199
Speaker 1: I see, this is your heart just pumping faster, so

510
00:26:04,240 --> 00:26:05,639
Speaker 1: it's putting through more blood.

511
00:26:06,080 --> 00:26:09,680
Speaker 3: Yeah, it's squeezing harder, so per beat, it's pushing more

512
00:26:09,720 --> 00:26:12,360
Speaker 3: blood out, and it's beating more times per minute. So

513
00:26:12,440 --> 00:26:14,600
Speaker 3: you get more bang for your buck, and you get

514
00:26:14,600 --> 00:26:17,119
Speaker 3: a lot of blood leaving the heart. Permitut it. But

515
00:26:17,520 --> 00:26:21,600
Speaker 3: then the percentage changes too. So the skeletal muscle, all

516
00:26:21,640 --> 00:26:25,400
Speaker 3: the muscles that produce the swimming movement, walking, movement, et cetera.

517
00:26:25,440 --> 00:26:29,400
Speaker 3: There's a high demand. The muscles want blood flow, they

518
00:26:29,440 --> 00:26:33,040
Speaker 3: want the nutrients that you've eaten recently. They could also

519
00:26:33,080 --> 00:26:35,879
Speaker 3: be coming from the liver. There's a high demand for

520
00:26:35,920 --> 00:26:39,520
Speaker 3: blood flow, for the nutrients, for the oxygen to support

521
00:26:39,760 --> 00:26:42,880
Speaker 3: energy production, so the muscles can keep doing their thing

522
00:26:42,960 --> 00:26:45,960
Speaker 3: and contracting. That can come at a cost of some

523
00:26:46,080 --> 00:26:49,440
Speaker 3: of the other organs. So on a percentage basis, the

524
00:26:49,440 --> 00:26:52,800
Speaker 3: gut goes from getting maybe twenty five percent of the

525
00:26:52,840 --> 00:26:55,280
Speaker 3: blood that's pumped out by the heart per minute to

526
00:26:55,400 --> 00:26:58,680
Speaker 3: maybe a couple percent. It gets cut dramatically.

527
00:26:59,200 --> 00:27:03,040
Speaker 1: Well sage are absolutely like it's getting less or just

528
00:27:03,119 --> 00:27:04,000
Speaker 1: less of the blood.

529
00:27:04,000 --> 00:27:06,480
Speaker 3: It's getting less of the pie. It's getting less of

530
00:27:06,480 --> 00:27:07,720
Speaker 3: the pie.

531
00:27:07,880 --> 00:27:10,119
Speaker 1: When we come back, we'll talk about how all of

532
00:27:10,160 --> 00:27:13,920
Speaker 1: these shenanigans with your digestive system and your muscles, how

533
00:27:13,960 --> 00:27:17,600
Speaker 1: that affects your swimming experience and ability to stay afloat.

534
00:27:18,400 --> 00:27:27,639
Speaker 1: We'll be right back, and we're back.

535
00:27:28,119 --> 00:27:32,280
Speaker 3: So we've known that for many years, and that was

536
00:27:32,560 --> 00:27:36,959
Speaker 3: part of the impetus or the rationale for the waiting

537
00:27:36,960 --> 00:27:42,159
Speaker 3: of thirty minutes, is you ate, your gut needs blood flow.

538
00:27:42,600 --> 00:27:46,760
Speaker 3: Your muscles may not get enough blood supply while you're swimming.

539
00:27:47,119 --> 00:27:50,440
Speaker 3: That could be catastrophic. If you can't support the swimming

540
00:27:50,480 --> 00:27:54,159
Speaker 3: motion then you're going to drop or somehow. That was

541
00:27:54,240 --> 00:27:58,560
Speaker 3: causing a muscle cramp. But interestingly, on an absolute basis,

542
00:27:59,000 --> 00:28:01,919
Speaker 3: the amount of blood flow going to the gut actually

543
00:28:01,960 --> 00:28:05,919
Speaker 3: increases because the cardiac out with the total increase, but

544
00:28:06,040 --> 00:28:07,840
Speaker 3: percentage wise it went way down.

545
00:28:08,960 --> 00:28:10,800
Speaker 1: What does that mean then? Does that mean that your

546
00:28:10,880 --> 00:28:14,960
Speaker 1: muscles are getting less blood if you're trying to digest

547
00:28:14,960 --> 00:28:15,920
Speaker 1: something at the same time.

548
00:28:16,359 --> 00:28:20,879
Speaker 3: The muscles, again, they're a hungry beast. They will steal

549
00:28:21,480 --> 00:28:27,959
Speaker 3: rub and sheet from everybody else, which is a survival mechanism.

550
00:28:27,760 --> 00:28:30,040
Speaker 1: Right, that's the most important thing at the moment.

551
00:28:30,280 --> 00:28:32,439
Speaker 3: The fight or flight. You got to fight off that

552
00:28:32,640 --> 00:28:36,160
Speaker 3: lion or run away from it, and so your muscles

553
00:28:36,440 --> 00:28:40,360
Speaker 3: have evolved to be able to steal blood to support

554
00:28:40,400 --> 00:28:43,800
Speaker 3: that activity. Yeah, it's an interesting thing. So even during

555
00:28:44,120 --> 00:28:47,760
Speaker 3: exercising in the heat, your muscles are so profound in

556
00:28:47,840 --> 00:28:51,520
Speaker 3: their demand for blood they will steal it from the skin.

557
00:28:52,400 --> 00:28:55,560
Speaker 3: And when you're exercising in the heat, that can predispose

558
00:28:55,600 --> 00:29:00,880
Speaker 3: you to heat related illness or heat stroke. Whoamuscle doesn't care,

559
00:29:01,560 --> 00:29:04,360
Speaker 3: it's just you want to exercise, you want to keep

560
00:29:04,440 --> 00:29:07,080
Speaker 3: running at a certain speed. It'll take the blood from

561
00:29:07,120 --> 00:29:09,760
Speaker 3: somewhere else, just to give an example. So it'll steal

562
00:29:09,760 --> 00:29:12,760
Speaker 3: from the skin, and it'll steal from the gut, and

563
00:29:12,840 --> 00:29:16,800
Speaker 3: it's all trying to produce that exercise or that physical activity.

564
00:29:17,080 --> 00:29:19,479
Speaker 1: Okay, I think you're telling me that we don't have

565
00:29:19,560 --> 00:29:22,160
Speaker 1: to worry about your muscles not getting enough nutrients just

566
00:29:22,200 --> 00:29:24,000
Speaker 1: because you just ate before going swimming.

567
00:29:24,160 --> 00:29:26,120
Speaker 3: The muscles are going to get what they need no

568
00:29:26,200 --> 00:29:29,040
Speaker 3: matter what. So your muscles aren't. They're not magically not

569
00:29:29,080 --> 00:29:31,400
Speaker 3: going to get enough blood. We know that that's a

570
00:29:31,480 --> 00:29:34,720
Speaker 3: fallacy at this point, but there's a competition a little

571
00:29:34,720 --> 00:29:37,080
Speaker 3: bit between blood going to the gut and the muscle.

572
00:29:37,280 --> 00:29:40,160
Speaker 3: The muscle's going to win. And so if you just

573
00:29:40,360 --> 00:29:44,000
Speaker 3: ate a big meal that is very calorically dense, the

574
00:29:44,000 --> 00:29:46,120
Speaker 3: has a lot of fat in it, that's going to

575
00:29:46,120 --> 00:29:49,960
Speaker 3: be uncomfortable because that food is going to tend to

576
00:29:50,000 --> 00:29:53,960
Speaker 3: sit in the stomach and the digestive process is overall

577
00:29:54,040 --> 00:29:57,560
Speaker 3: going to be slower. If you've ever atened and tried

578
00:29:57,560 --> 00:30:00,560
Speaker 3: to go for a run, a lot of people know

579
00:30:00,680 --> 00:30:04,600
Speaker 3: that feeling. It's pretty uncomfortable. Swimming can be the same.

580
00:30:04,920 --> 00:30:09,840
Speaker 3: And interestingly, if we think about running versus swimming, position

581
00:30:10,080 --> 00:30:14,920
Speaker 3: can also influence gastric emptying. So if you're sitting or

582
00:30:14,920 --> 00:30:19,240
Speaker 3: you're standing, our gastric emptying rate is higher than when

583
00:30:19,280 --> 00:30:23,640
Speaker 3: we're lying down. So swimming, of course, we do in

584
00:30:23,720 --> 00:30:27,200
Speaker 3: what we call prone or supine position, laying down basically

585
00:30:27,280 --> 00:30:29,840
Speaker 3: uh huh exactly, either on our stomach or our back,

586
00:30:30,560 --> 00:30:34,320
Speaker 3: and that actually slows down gastric emptying.

587
00:30:34,680 --> 00:30:38,400
Speaker 1: Oh, because you don't have gravity pulling the food towards

588
00:30:38,520 --> 00:30:41,360
Speaker 1: the hole at the bottom of the stomach. Probably, So

589
00:30:41,640 --> 00:30:44,760
Speaker 1: does it slow down? Is it partly because the muscles

590
00:30:44,760 --> 00:30:47,400
Speaker 1: are pulling all of the blood that it slows indigestion

591
00:30:47,600 --> 00:30:50,120
Speaker 1: or is it just because it knows it needs to

592
00:30:50,160 --> 00:30:51,520
Speaker 1: sit in your stomach longer?

593
00:30:51,920 --> 00:30:54,320
Speaker 3: Yeah, I mean in terms of the swimming question, there's

594
00:30:54,320 --> 00:30:56,600
Speaker 3: a couple of things going on. Is you know, if

595
00:30:56,600 --> 00:30:59,000
Speaker 3: you eat a large meal, that's a greater challenge for

596
00:30:59,040 --> 00:31:02,680
Speaker 3: your digestives system. But that would be true of any exercise.

597
00:31:03,200 --> 00:31:06,680
Speaker 3: I think swimming interestingly has that position component, which could

598
00:31:06,840 --> 00:31:11,760
Speaker 3: make the situation worse. Another factor to consider is the temperature.

599
00:31:12,280 --> 00:31:13,480
Speaker 3: When are we typically.

600
00:31:13,200 --> 00:31:15,040
Speaker 1: Swimming summer, I guess.

601
00:31:15,200 --> 00:31:19,080
Speaker 3: Yeah, it's in Panama, where it's warm most.

602
00:31:18,840 --> 00:31:21,000
Speaker 1: Of the summer all year round. Yeah, but when it's

603
00:31:21,040 --> 00:31:21,440
Speaker 1: warm out.

604
00:31:22,120 --> 00:31:25,200
Speaker 3: But when it's warm out there can also be a

605
00:31:25,240 --> 00:31:28,880
Speaker 3: greater challenge because we need to thermo regulate so the skin.

606
00:31:29,160 --> 00:31:32,080
Speaker 3: Taking it back to blood flow, the skin needs greater

607
00:31:32,160 --> 00:31:36,280
Speaker 3: blood flow to be able to support thermal regulation. Make

608
00:31:36,280 --> 00:31:38,240
Speaker 3: sure we're not getting too hot. You get some sweat

609
00:31:38,240 --> 00:31:40,960
Speaker 3: production going on, you get vase dilation of the skin,

610
00:31:41,080 --> 00:31:44,320
Speaker 3: so our skin appears a little bit more flushed. That's

611
00:31:44,360 --> 00:31:47,120
Speaker 3: all trying to get rid of heat, but it's due

612
00:31:47,120 --> 00:31:50,040
Speaker 3: to increased blood flow to the skin. Again, then we're

613
00:31:50,080 --> 00:31:53,440
Speaker 3: thinking about a competition for blood flow. So blood needs

614
00:31:53,440 --> 00:31:54,880
Speaker 3: to go to the skin, it needs to go to

615
00:31:54,880 --> 00:31:58,320
Speaker 3: the muscle, and it needs to go to the digestive system.

616
00:31:58,440 --> 00:32:02,840
Speaker 3: If we're thinking about eating before swimming in a warm environment.

617
00:32:02,480 --> 00:32:05,480
Speaker 1: Are you saying that the digestive system basically loses.

618
00:32:05,600 --> 00:32:08,880
Speaker 3: Kind of yes, it's going to take third place to

619
00:32:08,920 --> 00:32:12,000
Speaker 3: the skin, certainly to the muscle.

620
00:32:12,400 --> 00:32:14,720
Speaker 1: So it's kind of opposite of the lore. Right, The

621
00:32:14,760 --> 00:32:17,960
Speaker 1: lore was that the stomach would suck blood flow from

622
00:32:18,000 --> 00:32:20,120
Speaker 1: your muscles. But it's the opposite. It's going to lose

623
00:32:20,280 --> 00:32:22,640
Speaker 1: and therefore it's going to take longer to digest and

624
00:32:22,720 --> 00:32:25,160
Speaker 1: even more because you're laying down when you're assuming, and

625
00:32:25,200 --> 00:32:27,120
Speaker 1: that's going to cause you discomfort.

626
00:32:27,480 --> 00:32:29,640
Speaker 3: That's really I think this story. It's a comfort or

627
00:32:29,680 --> 00:32:30,840
Speaker 3: discomfort issue.

628
00:32:31,120 --> 00:32:33,800
Speaker 1: I see, And where does a discomfort come from? Why

629
00:32:33,800 --> 00:32:36,360
Speaker 1: doesn't your body like having food around belong?

630
00:32:36,640 --> 00:32:39,000
Speaker 3: That's a that's a good question. It could be the

631
00:32:39,080 --> 00:32:43,160
Speaker 3: distension of the stomach. Right, so use a large meal.

632
00:32:43,520 --> 00:32:46,360
Speaker 3: Oh I feel, I feel really full. That's not a

633
00:32:46,560 --> 00:32:51,600
Speaker 3: comfortable feeling. It's probably the mechanical stension and the sensory

634
00:32:51,680 --> 00:32:55,320
Speaker 3: neurons are detecting that and letting you know, hey, you're

635
00:32:55,360 --> 00:32:59,240
Speaker 3: really full, don't eat more, right, So that's that's part

636
00:32:59,280 --> 00:33:02,000
Speaker 3: of it is, is trying to regulate energy intake.

637
00:33:02,720 --> 00:33:05,800
Speaker 1: Like you had a full meal, whoa, whoa, you know,

638
00:33:06,080 --> 00:33:06,880
Speaker 1: don't need anymore.

639
00:33:07,240 --> 00:33:11,680
Speaker 3: That allows time for your digestive system to interpret the

640
00:33:11,760 --> 00:33:14,360
Speaker 3: meal and go to the brain and say, slow down,

641
00:33:14,840 --> 00:33:17,240
Speaker 3: you're starting to get full. So it does take time

642
00:33:18,200 --> 00:33:19,760
Speaker 3: those signals to happen.

643
00:33:20,240 --> 00:33:23,000
Speaker 1: Did discomfort is a signal that your stomach's trying to

644
00:33:23,040 --> 00:33:27,080
Speaker 1: tell your brain, hey, stop eating. But I wonder if

645
00:33:27,080 --> 00:33:29,960
Speaker 1: it's also trying to tell you to not exercise because

646
00:33:29,960 --> 00:33:32,200
Speaker 1: it knows that your stomach needs the blood flow.

647
00:33:32,720 --> 00:33:35,400
Speaker 3: Right, What does this all orchestrator are controlled by is

648
00:33:35,400 --> 00:33:39,680
Speaker 3: the autonomic nervous system. Always tell my students autonomic is automatic.

649
00:33:40,160 --> 00:33:43,880
Speaker 3: So it's the nervous system that is dealing with controlling

650
00:33:44,280 --> 00:33:47,680
Speaker 3: our internal environment. So when we think about fight or

651
00:33:47,720 --> 00:33:52,320
Speaker 3: flight or rest and digest. So I think you're right.

652
00:33:52,480 --> 00:33:55,440
Speaker 3: I think that makes intuitive sense that some of that

653
00:33:55,640 --> 00:33:59,960
Speaker 3: signal is rest and digests. Let's process this meal, Let's

654
00:34:00,120 --> 00:34:02,480
Speaker 3: get the nutrients from it so that way we can

655
00:34:02,520 --> 00:34:04,560
Speaker 3: do the next thing. There's no need to go out

656
00:34:04,560 --> 00:34:06,480
Speaker 3: and hunt and gather, so just relax.

657
00:34:07,360 --> 00:34:09,640
Speaker 1: What about cramps? I know crams was sort of in

658
00:34:09,640 --> 00:34:12,760
Speaker 1: that Boyscout report, like if you eat it before swimming,

659
00:34:12,800 --> 00:34:17,520
Speaker 1: you might get cramps and then you'll drown. What causes cramps.

660
00:34:17,320 --> 00:34:19,080
Speaker 3: Believe it or not, there's things that we still don't

661
00:34:19,120 --> 00:34:21,840
Speaker 3: know the answer to, we don't have the final answer to,

662
00:34:22,400 --> 00:34:26,120
Speaker 3: or we're still trying to better understand. So muscle cramps,

663
00:34:26,360 --> 00:34:30,560
Speaker 3: those are very likely the result of two things, one

664
00:34:31,080 --> 00:34:38,000
Speaker 3: a water electrolyte imbalance and two neural dysregulation. So obviously

665
00:34:38,040 --> 00:34:41,200
Speaker 3: our body has a significant portion that is water, right,

666
00:34:41,440 --> 00:34:43,799
Speaker 3: something like seventy percent of our body is made up

667
00:34:43,840 --> 00:34:47,760
Speaker 3: of water. We also have electrolytes. These are basically salts,

668
00:34:48,200 --> 00:34:53,840
Speaker 3: and when there is not good harmony between the amount

669
00:34:53,840 --> 00:34:55,799
Speaker 3: of water that we have in the amount of electrolytes

670
00:34:55,800 --> 00:34:59,520
Speaker 3: that we have, they can create very serious problems. But

671
00:35:00,320 --> 00:35:03,680
Speaker 3: that wouldn't be recency to a meal. That would be

672
00:35:04,239 --> 00:35:07,760
Speaker 3: too much time from a meal with some electrolytes.

673
00:35:08,160 --> 00:35:11,480
Speaker 1: Oh, because when you eat, you're bringing in those electrolytes

674
00:35:11,520 --> 00:35:13,680
Speaker 1: that you need, and if you haven't eaten in a while,

675
00:35:13,760 --> 00:35:15,399
Speaker 1: you're gonna your body's going to run out of them.

676
00:35:15,640 --> 00:35:19,919
Speaker 3: Exactly. That's sort of our number one hypothesis, along with

677
00:35:20,440 --> 00:35:23,560
Speaker 3: something going on with a neuro muscular system.

678
00:35:23,760 --> 00:35:25,200
Speaker 1: All right, So it sounds like you don't want to

679
00:35:25,200 --> 00:35:27,680
Speaker 1: eat too close to swimming, but you do want to

680
00:35:27,680 --> 00:35:31,680
Speaker 1: eat something beforehand at some point. Interesting. All right, So

681
00:35:31,760 --> 00:35:34,840
Speaker 1: then I guess the final question, Steve is was my

682
00:35:34,880 --> 00:35:35,719
Speaker 1: aunt lying to me.

683
00:35:37,120 --> 00:35:41,320
Speaker 3: Yes, Oh, you should thank her for taking your swimming

684
00:35:41,360 --> 00:35:45,920
Speaker 3: every day. Yeah, it's an interesting question. But at the

685
00:35:46,000 --> 00:35:47,600
Speaker 3: end of the day, I think, as we've hit on

686
00:35:47,640 --> 00:35:50,920
Speaker 3: a couple of times, it's not really a safety issue.

687
00:35:51,400 --> 00:35:54,080
Speaker 3: I would say under nutrition is probably more of a

688
00:35:54,120 --> 00:35:56,360
Speaker 3: safety issue. It's more of a comfort issue.

689
00:35:56,920 --> 00:35:59,320
Speaker 1: I see. Maybe that's why my aunt was really trying

690
00:35:59,320 --> 00:36:01,399
Speaker 1: to help me avoid was the discomfort?

691
00:36:02,320 --> 00:36:02,960
Speaker 3: Probably not.

692
00:36:05,200 --> 00:36:09,640
Speaker 1: Or just not me throwing up from the pool. Well,

693
00:36:09,760 --> 00:36:12,279
Speaker 1: there you have it. The answer to the question is

694
00:36:12,760 --> 00:36:15,279
Speaker 1: you don't have to wait thirty minutes after eating before

695
00:36:15,320 --> 00:36:19,360
Speaker 1: you can go swimming, but you probably should. Thanks for

696
00:36:19,440 --> 00:36:24,640
Speaker 1: joining us, you've been listening to Science Stuff. The production

697
00:36:24,800 --> 00:36:28,400
Speaker 1: of iHeartRadio written and produced by me Or hitch Ham,

698
00:36:28,600 --> 00:36:32,440
Speaker 1: executive producer Jerry Rowland, an audio engineer and mixer Casey Peckram.

699
00:36:33,040 --> 00:36:35,239
Speaker 1: You can follow me on social media to search for

700
00:36:35,440 --> 00:36:38,560
Speaker 1: PhD comics and the name of your favorite platform. Be

701
00:36:38,600 --> 00:36:41,399
Speaker 1: sure to subscribe to Sign Stuff on the iHeartRadio app,

702
00:36:41,440 --> 00:36:44,680
Speaker 1: Apple Podcasts or wherever you get your podcasts, and please

703
00:36:44,880 --> 00:36:54,879
Speaker 1: tell your friends we'll be back next Wednesday with another episode. Okay, Well,

704
00:36:54,920 --> 00:36:57,400
Speaker 1: what if your niece or nephew orview if you have

705
00:36:57,640 --> 00:36:59,719
Speaker 1: do you have kids? Yeah? Yeah? Or let's say, like

706
00:36:59,760 --> 00:37:02,600
Speaker 1: what if your kids had two cheeseburgers and then they

707
00:37:02,600 --> 00:37:04,919
Speaker 1: wanted to jump into the pool. Would you be like, yes,

708
00:37:05,040 --> 00:37:07,560
Speaker 1: go for it, or like maybe have a seat for

709
00:37:07,600 --> 00:37:08,000
Speaker 1: a second.

710
00:37:08,320 --> 00:37:10,600
Speaker 2: So first of all, my said two and a half.

711
00:37:10,680 --> 00:37:12,680
Speaker 2: So our policies we do not feed him before going

712
00:37:12,680 --> 00:37:14,400
Speaker 2: into the pool because we do not want him pooping

713
00:37:14,400 --> 00:37:16,840
Speaker 2: in the pool because he is not potty trade, completely

714
00:37:16,840 --> 00:37:22,440
Speaker 2: different conversation. It's a different strategy we're approaching in that situation.

715
00:37:22,800 --> 00:37:24,680
Speaker 2: We feed him unch, he goes down for nap time,

716
00:37:24,760 --> 00:37:26,239
Speaker 2: we wake up, we change his diaper, and we take

717
00:37:26,320 --> 00:37:26,799
Speaker 2: him to the pool.

718
00:37:27,239 --> 00:37:30,600
Speaker 1: I see it's more important to time than diaper change.

719
00:37:31,040 --> 00:37:32,960
Speaker 2: But very different. Yeah,