[michael-ax]

EXACTLY! That's why you breathe into a paper-bag (or smoke) to increase CO2 so that the filters open and you get to a point where you feel O2 tingles all over your brain. This is extremely powerful; I practiced that and underwater held-breath swimming and hanging out underwater for a long time to obtain permanent changes that have made me far more effective. Based on work first published by W.Wenger out of a Maryland Think-tank some 50? years ago.

[Etherlord87]

So wim hof method, by breathing a lot, deprives you of oxygen, reducing brain functionality and therefore giving you a drug-like pleasure, whereas recycling air in a bag ends up giving you more oxygen and increasing brain efficiency? May sound like sarcasm, but honestly, do I need a diving gear to test it on myself or is a paper bag enough?

[thatcat]

What kind of changes?

[rybosworld]

I think they are referring to this: https://winwenger.com/books/books-online/two-guaranteed-ways...

"For accumulating 20 hours of held-breath underwater swimming within 3 weeks from start to finish– 10 or more points I.Q. gain; better span of attention; better span of awareness; better awareness of the interrelatedness of things and of ideas and/or perceptions; finding yourself way better at winning arguments or disputes!"

It should go without saying this is nonsense.

[grugagag]

This is probably nonsense for a healthy person but for someone who doesn’t get enough o2 it probably has the same benefits of a person who does.

[rybosworld]

That's the kind of inference that allows these claims to proliferate.

This article makes a lot of claims about I.Q. scores before and after holding breath (specifically underwater, for some reason), but there are no links to studies, no mention of who or how many people participated, etc.

This is the definition of a baseless claim.

[algorias]

Not defending the overall claim, but there's a plausible reason why being underwater matters: the mammalian diving reflex. Holding your breath on land is not the same.

[relaxing]

That too is the kind of inference that allows these claims to proliferate.

[tapotatonumber9]

Perhaps being under water makes it harder to “cheat”.