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0 2 4 6 8 10 12 14 Weeks of training

Figure 84-7

Increase in Vo2 Max over a period of 7 to 13 weeks of athletic training. (Redrawn from Fox EL: Sports Physiology. Philadelphia: Saunders College Publishing, 1979.)

marathoners. However, it is also likely that many years of training increase the marathoner's Vo2 Max by values considerably greater than the 10 per cent that has been recorded in short-term experiments such as that in Figure 84-7.

Oxygen Diffusing Capacity of Athletes. The oxygen diffusing capacity is a measure of the rate at which oxygen can diffuse from the pulmonary alveoli into the blood. This is expressed in terms of milliliters of oxygen that will diffuse each minute for each millimeter of mercury difference between alveolar partial pressure of oxygen and pulmonary blood oxygen pressure. That is, if the partial pressure of oxygen in the alveoli is 91 mm Hg and the oxygen pressure in the blood is 90 mm Hg, the amount of oxygen that diffuses through the respiratory membrane each minute is equal to the diffusing capacity.The following are measured values for different diffusing capacities:

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Essentials of Human Physiology

Essentials of Human Physiology

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