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  • It’s a scourge sweeping the nation, from marathoners to people just going on their

  • morning jog.

  • “I was at about 9 miles, when all of a sudden I had a very unsettling feeling in my bowels

  • and I knew it wasn’t a question of if I was going to have to go to the bathroom, but

  • exactly where.

  • And it was gonna happen in the next 15 seconds.”

  • That’s right: runner’s diarrhea, the sudden and uncontrollable urge to poop, right in

  • the middle of a long run.

  • But how and why does this happen?

  • I’m Anna Rothschild, and this is Gross Science.

  • When we talk about runner’s diarrhea were not referring to people who go for a run with

  • a stomach bug or GI illness.

  • Runner’s diarrhea is something different that happens to healthy people just going

  • out for some exercise.

  • And it’s super common.

  • One study from the 80s found that a third of the 707 marathon runners surveyed experienced

  • the urge to defecate, both during and immediately after running.”

  • And other surveys have found even higher numbers.

  • Now, there’s no one answer for why this happens, but scientists have a few ideas.

  • First of all, when you go for a run, your internal body temperature rises.

  • This is especially true on a hot day.

  • It was a very hot dayit was about 85 degrees, which is a little bit hotter than

  • I normally run in.”

  • Right, and when you heat things up, they tend to get kind of melty.

  • That’s probably part of what happens to the feces in your colon.

  • On top of that, as one scientist I spoke with put it, the decelerating forces from your

  • feet landing probably cause anemulsifyingeffect.

  • It’s kind like youre creating a poop milkshake in your gut with every bounce.

  • Luckily there were lots of bushes nearby, and I found a discreet place to take care

  • of the situation.

  • Let’s call it an extreme bowel event.”

  • So, why the urgency?

  • Well, again, the bouncing motion probably puts extra pressure on your colon, kinda simulating

  • the type of pressure it’s under when your bowels are totally fullindicating that

  • you gotta go.

  • Doctors suspect the jostling motion is involved with this phenomenon because runners experience

  • these types of extreme bowel events more often than bikers, who are also aerobically taxing

  • their bodies.

  • Other things may come into play as well.

  • Stresssay during a big racemay have an effect on your gut.

  • Hormone fluctuations during exercise may also be involved.

  • And, as a side note, dehydration and limited blood flow to your bowels may cause damage

  • to your intestinal lining, leading to bloody stoolwhich is another issue that can affect

  • serious runners.

  • Sadly, there isn’t a sure-fire way to prevent these problems.

  • Obviously, stay hydrated.

  • And, if you can, try to go to the bathroom before your run, and maybe eat whatever foods

  • help that process along for you.

  • Running at around the same time everyday can help too, because for many of us, our GI tract

  • tends to be on a pretty reliable schedule.

  • If the problem gets really bad though, you can talk to your doctor about getting some

  • pills to slow the action of your colon.

  • But remember, runner’s diarrhea happens to the best of us, and there’s nothing wrong

  • with picking a route with lots of pit stops so you don’t end up in an awkward situation.

  • “I used leaves, in case youre wondering.”

  • Ew.

It’s a scourge sweeping the nation, from marathoners to people just going on their


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为什么跑步时必须大便?(Why Do I Have To Poop When I Run?)

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    joey joey 發佈於 2021 年 05 月 04 日