PHSI2005 Final: aerobic exercise
15 Jan 2019
School
Department
Course
Professor
Document Summary
In prolonged exercise, o2 must be supplied to the muscles. Therefore, except in some elite athletes, diffusion is not a limiting factor (cid:120) test this by measuring arterial po2 as a function of exercise level. In most people, arterial po2 stays at 100 mmhg from rest to maximal exercise (cid:120) an exception is some elite athletes who have exceptionally high co. Presumably, flow has reached such a high velocity through the lungs that the diffusion equilibrium does not have time to reach completion: blood flow three components co, [hb], o2 saturation of hb. Hb; reinfuse blood after 4 weeks for even more hb: taking epo as a performance enhancer. Haemoglobin saturation (cid:120) depends on po2 of the blood which in turn depends on gas exchange in the lungs normally saturated. Increased numbers of capillaries increases the surface area for diffusion and shortens the diffusion distance. It is disputed whether or not this is a practical limit in aerobic activities (cid:120)
