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J Appl Physiol 45: 430-436, 1978;
8750-7587/78 $5.00
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Journal of Applied Physiology, Vol 45, Issue 3 430-436, Copyright © 1978 by American Physiological Society

ARTICLES

Evaporative water loss in man in a gravity-free environment

C. S. Leach, J. I. Leonard, P. C. Rambaut and P. C. Johnson

Daily evaporative water losses (EWL) during the three Skylab missions were measured indirectly using mass and water-balance techniques. The mean daily values of EWL for the nine crew members who averaged 1 h of daily exercise were: preflight 1,750 +/- 37 (SE) ml or 970 +/- 20 ml/m2 and inflight 1,560 +/- 26 ml or 860 +/- 14 ml/m2. Although it was expected the EWL would increase in the hypobaric environment of Skylab (one-third atmosphere). an average decrease from preflight sealevel conditions of 11% was measured. The results suggest that weightlessness decreased sweat losses during exercise and possibly reduced insensible skin losses as well. The weightlessness environment apparently promotes the formation of an observed sweat film on the skin surface during exercise by reducing convective flow and sweat drippage, resulting in high levels of skin wettedness that favor sweat suppression.


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