Name: Why Do I Have To Poop When I Run?
Uploaded: 2021-05-04T02:56:10.000Z
Duration: 4 min
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

程度の副詞

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

“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

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

I'm Anna Rothschild, and this is Gross Science.

When we talk about runner's diarrhea we're not referring to people who go for a run with

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

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.

“It was a very hot day—it was about 85 degrees, which is a little bit hotter than

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 an “emulsifying” effect.

It's kind like you're 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

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 full—indicating that

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

Stress—say during a big race—may 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 stool—which is another issue that can affect

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

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

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

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 you're wondering.”

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Why Do I Have To Poop When I Run?

awkward

phenomenon

gross

situation