Wouldn't gentle movement while breathing up assist in the rate at which CO2 is transported out of peripheral parts of the body (legs etc.) by increasing blood flow, both on a macro scale and a micro scale. I realize that it would also increase the rate of CO2 production, but I wonder what the net effect would be ...
Also, I've wondered from time to time about the effect of Lactic acid on the urge to breathe. Does it stimulate demand just as CO2 would, does it compete for the receptors, but not stimulate the demand to breathe (i.e. act as an agonist) or does it have no effect?
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