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Evaporative water loss in man in a gravity-free environmentDaily 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 hr of daily exercise were: preflight 1,750 + or - 37 (SE) ml or 970 + or - 20 ml/sq m and inflight 1,560 + or - 26 ml or 860 + or - 14 ml/sq m. Although it was expected the EWL would increase in the hypobaric environment of Skylab, an average decrease from preflight sea-level conditions of 11% was measured. The results suggest that weightlessness decreased sweat losses during exercise and possibly reduced insensible skin losses. 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.
Document ID
19780068634
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Leach, C. S.
(General Electric Co. Houston, TX, United States)
Leonard, J. I.
(General Electric Co. Houston, TX, United States)
Rambaut, P. C.
(General Electric Co. Houston, TX, United States)
Johnson, P. C.
(NASA Johnson Space Center Space Research and Operations Div.; General Electric Co.; Baylor University, Houston, Tex., United States)
Date Acquired
August 9, 2013
Publication Date
September 1, 1978
Publication Information
Publication: Journal of Applied Physiology: Respiratory
Subject Category
Aerospace Medicine
Accession Number
78A52543
Distribution Limits
Public
Copyright
Other

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