Attempted acclimatization by vigorous exercise during periodic exposures to simulated altitude /
Raymond H. Murray, Spencer Shropshire, Leonard Thompson.

Description

Main Author

Murray, Raymond H., 1925-

Related Names

Thompson, Leonard, author.
Shropshire, Spencer, author.
Aerospace Medical Research Laboratories (U.S.)
Indiana University Medical Center

Language(s)

English

Published

Wright-Patterson Air Force Base, Ohio : Aerospace Medical Research Laboratories, Aerospace Medical Division, Air Force Systems Command, United States Air Force, XXXX

Subjects

Physical education and training.
Exercise > Exercise / Physiological aspects.
Altitude, Influence of.
Physical education and training.
Exercise > Exercise / Physiological aspects.
Altitude, Influence of.

Summary

Acclimatization to altitude by means of periodic short-term chamber exposures could have military and athletic application by preparing unacclimatized subjects for endurance performance at altitude. Three unconditioned men were trained daily by endurance running for 3 weeks at ground level. Following control measurements, they exercised strenuously on a treadmill 2 hours daily for 17 days in a chamber at a simulated altitude of 2300 meters. Responses were evaluated by: symptoms; maximum work performance (as measured by the duration of exercise-to-tolerance); maximal heart rate; duration of breath-holding; production of lactate and excess lactate; maximum expiratory minute volume and oxygen consumption. During the initial periods of exercise at altitude, maximum work performance fell significantly from control levels (average 23%), with striking symptoms of exhaustion; breath-holding duration fell 13%; the production of excess lactate rose significantly in two subjects. Over the remainder of the altitude exposures exercise performance and breath-holding duration increased to near control levels while fatigue was much less noticeable. Maximal heart rate varied greatly. There was no significant change in maximal oxygen consumption during exercise at altitude, but expiratory minute volume rose slightly. During the period of altitude exposures, symptoms common with chronic exposures (malaise, Cheyne-Stokes respiration, rheumatic complaints) were often noted both in the chamber and at work and at home. (Author).

Note

"September 1967."

Physical Description

iii, 11 pages : illustrations ; 28 cm.

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