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In the 3rd episode, Yousuke asks Mikoto to hold his breath for 3 minutes by
indulging his head into a bowl of water to let him join the bicycle club.
After one day of training, Mikoto manages to hold his breath for 4 minutes.
When Yousuke asks him how he achieved that, Mikoto answers that he replaced
the water with soda to be able to do it.

I don't understand how using sode instead of water would help someone to hold
his breath longer. What is the explanation for this?

![enter image description here](https://i.stack.imgur.com/Rbcu9.png)

![enter image description here](https://i.stack.imgur.com/KvNZW.png)


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2014-03-20T15:23:37.113
8154
2014-03-22T19:33:37.263
2014-03-20T15:28:46.850
63
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question
over-drive
How did Mikoto hold his breath for four minutes?


I did not watch this Series, nor could I find a official source stating this.
This is just a theory I deduced.

Considering he said "see, because it's harder to drink soda." He most likely
figured: If you drink, you hold your breath. If you drink soda it's
harder/takes longer. So I can hold my breath longer. Looking at the response
of him and the people he says it to I find this to be one of the best
explanations.

Then the actual physics behind it for him to actually manage to last longer
due to this :

> The air we breath is 21% oxygen. By inhaling 100% oxygen for a couple of
> minutes (enough to washout the nitrogen from the functional residual
> capacity in your lungs), you can pretty much hold your breath about 4-5
> times longer than normal. Anesthesiologists routinely do this before putting
> patients out as a safety thing (hence the mask when you "go off to sleep")
> because in an emergency the patient can usually "hold" his or her breath for
> 5-10 minutes after breathing 100% oxygen. And this works because the patient
> is already unconscious and **can't feel his/her CO2 level rising.**
>
> Doing this awake, however, is very difficult as you can feel that CO2 rise
> and even though your lungs are still full of oxygen your brain will be
> freaking out and demanding that you take a breath. It is possible to
> overcome that breath instinct, however, with some training or serious
> dedication. This is part of the reason that hyperventilation (really rapid
> deep breathing) before breath holding helps you hold your breath - you drive
> your CO2 level way down and it takes longer for your brain to reach the
> freakout point while you're breath-holding. This is also why it's dangerous
> to do so: while that CO2 level is rising again you may well burn through
> your oxygen reserve (and since your brain still feels fine with regards to
> CO2) you can lose consciousness from hypoxia. Fun, right?
> [Source](http://www.reddit.com/r/askscience/comments/1ph0df/)

Short Summary:

Due to him getting used to the CO2 level Rising, his brain does not panic him
to take a breath. So due to training in CO2 he most likely reduced the point
of forcefully needing to breath to 4 minutes. Which is also about the max we
can hold in with 21% oxygen.


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2014-03-22T19:33:37.263
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2014-03-22T19:33:37.263
2020-06-17T09:17:53.303
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answer