Journal article
Effect of posture on heat acclimatization in man
Journal of applied physiology (1948), Vol.33(1), pp.8-13
07/1972
DOI: 10.1152/jappl.1972.33.1.8
PMID: 5037414
Abstract
Cardiovascular, thermoregulatory, and sympathoadrenal responses of two matched groups of four men each were compared during daily 90-min periods of upright and supine bicycle exercise at 49”/27” C dry/ wet bulb. The groups underwent 8 consecutive days of exercise in the heat at the same work load and Ievel of oxygen consumption, preceded and immediately followed by a uniformity trial in which they walked on a treadmill at 5.6 km/hr. The group which exercised while supine performed with lower mean rectal temperatures (P < 0.005) and lower heart rates (P < 0.05) than the group which exercised while upright. Sweat rates were similar for the two groups. Both groups were successfully acclimatized to heat as evidenced by significantly lower rectal temperatures and heart rates, and higher sweat rates after 8 days of exercise in the heat. The responses of the two groups to treadmill exercise were similar, indicating that both groups were acclimatized to a similar degree. Norephinephrine excretion during exercise tended to be greater while subjects were upright and tended to decrease during acclimatization. It appears that the reduced gravitational stress of the recumbent position permits attainment of a level of acclimatization to work in the heat similar to that achieved in the upright posture with the benefit of less physiologic strain during induction of acclimatization.
Details
- Title: Subtitle
- Effect of posture on heat acclimatization in man
- Creators
- J T MaherD E BassD D HeistadE T AngelakosL H Hartley
- Resource Type
- Journal article
- Publication Details
- Journal of applied physiology (1948), Vol.33(1), pp.8-13
- Publisher
- United States
- DOI
- 10.1152/jappl.1972.33.1.8
- PMID
- 5037414
- ISSN
- 0021-8987
- eISSN
- 2691-2473
- Language
- English
- Date published
- 07/1972
- Academic Unit
- Cardiovascular Medicine; Neuroscience and Pharmacology; Internal Medicine
- Record Identifier
- 9984040562302771
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