I wonder...are there any "fast" cyclists who are mouth-breathers? Do the sinus membranes absorb any oxygen into the blood, thus increasing VO2 max? I am most definitely not in the "fast" category, and am primarily a mouth breather. At rest I preferentially breathe through my nose, but congestion or the slightest elevation in heart rate requires a switch to mouth breathing.
Feel free to chime in.
September 29, 2009
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