THE EFFECT OF DECOMPRESSION OF HUMAN METABOLISM DURING AND AFTER EXERCISE

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Abstract
The O2 consumption during and after activity was measured in 6 groups of men at various altitudes. Each of the groups performed a different exercise, 4 being modified step-ups and 2, arm exercises. In all series except one the metabolic rate increased during the activity faster at an altitude of 30,000 ft. than at sea level. The ratio of O2 consumed during recovery to that consumed during activity was greater at altitude, as was the length of time necessary for restoration of the resting level. These effects were shown in the arm series to become increasingly evident as the individual was decompressed from sea level to 10,000, 18,000, 30,000 and 33,750 ft. When the exercise was relatively isotonic and localized, decompression increased the total O2 consumption due to the exercise. When the muscular contraction was isometric and localized, decompression decreased the total consumption. It is concluded that the basic disturbance in the aerobic oxidation system described in previous reports manifested itself during muscular work by increasing the rate at which an O2 debt was incurred and by retarding the rate of recovery, as well as by altering the total excess metabolism.

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