LACTIC ACID PHYSICAL FITNESS AND HIGH ALTITUDE.
NATIONAL JEWISH HOSPITAL DENVER COLO
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Healthy young men acclimatized to 5,300 feet and in a sedentary state were assembled in the spring of 1963, 1964 and 1965 for a two-variable four-part study of the effect of physical fitness on acute exposure to one weeks residence at 14,150 feet. In part one, the subjects underwent a battery of tests of ambient altitude. In part two, immediately thereafter, these tests were repeated at 14,150 feet. The subjects then returned to ambient altitude where they spent 4-5 weeks in a physical conditioning program. In part three, the test battery was repeated at the end of the fitness program and in part four, another week of tests at 14,150 feet was completed. These studies indicate that a month of physical training significantly lowers both the resting and exercise arterial blood lactic acid level using a bicycle ergometer work load at 600 Kg mmin. Exposure to altitude raised resting and exercise HLA levels in the sedentary state but did not alter the lowered values of the fit state. Fitness also prevented at altitude the hyperventilation and increased oxygen consumption seen in the second 5 minutes of the 10 minute work period in the sedentary state. A number of hematological, blood gas and electrolyte responses to exercise and to altitude were not altered by becoming fit. Subjects in the fit state were less symptomatic and more effective in technical duties at altitude than when in a sedentary state. Author
- Personnel Management and Labor Relations
- Medicine and Medical Research