should be studying 102 wrote:
you would actually be really interested in some stuff that Dr. Tim Noakes has put out there. It is.... not exactly mainstream as far as exercise physiology goes.
One of his big theories is that availability of oxygen in the skeletal muscle is NOT the limiting factor of endurance performance. His main line of evidence is the relatively low prevalence of myocardial ischemia -> angina -> myocardial infarction/heart attack. His logic is basically that if it were the muscles running out of oxygen that caused a slow down, the heart (as the hardest working muscle) would in theory be impacted first, and more runners would just drop dead when they decided to pick up the pace.
He argues that it is a neurologically controlled limit or GOVERNOR on activation of skeletal muscle fibers that causes the limits of aerobic performance. he says that you should train at lower elevations because that allows you to train at higher INTENSITIES, thus pushing the envelope and gradually increasing your brain's willingness to recruit a higher and higher percentage of total muscle fibers.
But if the "central governor" is sensing oxygen levels or some proxy of them, then the effect of altitude would be the same -- raising the limit. It doesn't seem to really matter what's imposing the limitation if that limit is based on physical conditions anyway.