Understanding Exertion O2 Levels
I understand O2 numbers but having a bit of trouble with the why's. I'm now on supplemental O2 and doing okay at 88 - 92 but upon exertion I get wiped out as the O2 drops which is understandable.
My understanding is this is due to CO2 retention/breath stacking which can be helped by pursed lip breathing. Is it that simple or am I missing something?