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Drinking and water balance during exercise and heat acclimationThe interactions between fluid intake and balance, and plasma ion, osmotic, and endocrine responses during dehydration produced by exercise in cool and warm environments during acclimation are explored. Two groups of five male subjects performed 8 days of ergometer exercise in hot and thermoneutral conditions, respectively. The exercise trials lasted 2 hr each. Monitoring was carried out on the PV, osmotic, sodium, and endocrine concentrations, voluntary fluid intake, fluid balances, and fluid deficits. A negative correlation was observed between the plasma sodium and osmolality during acclimation. The presence of hypervolemia during acclimation is suggested as a cause of drinking, while the vasopressin concentration was not found to be a significant factor stimulating drinking. Finally, the predominant mechanism in fluid intake during exercise and heat exposure is concluded to be the renin-angiotensin II system in the presence of reductions in total body water and extracellular plasma volumes.
Document ID
19830049253
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Greenleaf, J. E.
(NASA Ames Research Center Moffett Field, CA, United States)
Brock, P. J.
(NASA Ames Research Center Moffett Field, CA, United States)
Keil, L. C.
(NASA Ames Research Center Moffett Field, CA, United States)
Morse, J. T.
(NASA Ames Research Center Laboratory of Human Environmental Physiology, Moffett Field, CA, United States)
Date Acquired
August 11, 2013
Publication Date
February 1, 1983
Publication Information
Publication: Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
Volume: 54
ISSN: 0161-7567
Subject Category
Aerospace Medicine
Accession Number
83A30471
Distribution Limits
Public
Copyright
Other

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