PHGY 312 Lecture Notes - Lecture 11: Excess Post-Exercise Oxygen Consumption, Vo2 Max, Lactate Threshold
24 May 2016
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Metabolic rate increase, bt increase, coordination with postural and locomotive activity: while controlling for: Heat/water loss, acid base, equilibrium, minimize own work. When workload increase in square fashion, oxygen consumption doesn"t change instantaneously. Usually supplied by anaerobic metabolism; must pay for oxygen debt. If workload was higher, oxygen consumption at steady state will be higher. Vo2max changes with age; does not start from 0. Males and females before puberty have same vo2; after puberty, males have higher vo2max. Vo2 is usually measured per unit weight vo2/kg. See how much it costs to work/given distance. The optimal velocity becomes more narrow (uphill walk) and work increases. Downhill walking: pay a lot as it gets steeper because you have to brake to avoid freefall! Locomotion is a cheap exercise; we tend to overeat as overcompensation. Despite recruitment/distension of pulmonary capillaries and fall in pvr. Larger exchange area of blood-gas barrier and more volume of blood in o o o epithelium.
