BTW - an observation, a question...plus partial judgment
Observation - Anyone who has a pulse oximeter can confirm that normal tidal breathing can produce oxygen saturations in the mid to low 90s and about 2 full more forced breaths will have at about 98/99 after a few seconds
Question - Is this increased saturation through hyperventilation (two forced breaths) detrimental? For it to be detrimental the off gassing of CO2 and therefore the lower blood acidity at the start of breath-hold would have to have a greater impact than the increase oxygen saturation benefits.
Partial judgment - I don’t think we know and why there may be a good safety (belt and braces) basis for saying never breathe more than normal tidal breathing prior to breathe hold it is rarely the practice even for the "no warm up" practitioners.
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Andy
Sydney, Australia
"Birds fly, when they get tired they land. Man thinks, when he gets tired he says 'I understand'" - Japanese proverb
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