Andrew Huberman· PhD
I do want to caution people that any time you're doing cyclic hyperventilation, you want to be very cautious about not doing it in or near water because it does greatly increase the risk of shallow water blackout.
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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.
I do want to caution people that any time you're doing cyclic hyperventilation, you want to be very cautious about not doing it in or near water because it does greatly increase the risk of shallow water blackout.
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but never ever ever do cyclic hyperventilation folks or any long exhale emphasized breathing even standing in a puddle because that gasp reflex is the thing that makes you shoot for the surface and if you don't do that you feel pretty peaceful until lights out