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Explain this for hyperventilating people..

Breath in and out into a paper bag where your first breath is 21% oxygen and each and every breath reduces the oxygen intake by 2% and this decreases by each breath...is this not slowing the brain by lack of oxygen?

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Picklebobble2 · 56-60, M

I think it's more a psychological thing rather than being of any medical benefit.
Focuses the mind to the task at hand;
Gives the 'patient' a physical task to 'aid their own recovery'.
Etc.

MikefromEP · 51-55, M

@Picklebobble2: Quite true.. but you can't dismiss this either