Andrew Huberman· PhD
One does need to be careful not do use them near water, the breathing techniques that is.
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We can't find evidence that holds up here. Proponents are reasoning from mechanism or analogy rather than direct human data, and the most credible skeptics raise objections we can't dismiss.
One does need to be careful not do use them near water, the breathing techniques that is.
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I actively dissuade people from doing any kind of breath work in conjunction with deliberate cold for the reason you mention. Or any kind of underwater anything.
No deep breathing prior to getting in there. Now, some of you might be asking, well, what about deep breathing while I'm in there? That's how I calm myself down. That's fine. But no emphasizing the exhales to blow off carbon dioxide. Certainly no submerging yourself intentionally.
And by the way, you should never, ever, ever do any kind of breathwork prior to getting into deliberate cold, prior to getting into very cold water because if you're doing a lot of exhaling, you're blowing off a lot of carbon dioxide. That will limit your gasp reflex. And there have been people who have done cyclic hyperventilation, deep breathing, then gone into water. And they didn't realize that they needed to breathe. They didn't get that gasp reflex early enough. And unfortunately, they blacked out and died.