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Dehydration-induced drinking in humansThe human tendency to experience a delay in rehydration (involuntary dehydration) after fluid loss is considered. The two primary factors contributing to involuntary dehydration are probably upright posture, and extracellular fluid and electrolyte loss by sweating from exercise and heat exposure. First, as the plasma sodium and osmotic concentrations remain virtually unchanged for supine to upright postural changes, the major stimuli for drinking appear to be associated with the hypovolemia and increase in the renin-angiotension system. Second, voluntary drinking during the heat experiments was 146% greater than in cool experiments; drinking increased by 109% with prior dehydration as opposed to normal hydration conditions; and drinking was increased by 41% after exercise as compared with the resting condition. Finally, it is concluded that the rate of sweating and the rate of voluntary fluid intake are highly correlated, and that the dispogenic factors of plasma volume, osmolality, and plasma renin activity are unrelated to sweat rate, but are likely to induce drinking in humans.
Document ID
19820062794
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Greenleaf, J. E.
(NASA Ames Research Center Biomedical Research Div., Moffett Field, CA, United States)
Date Acquired
August 10, 2013
Publication Date
July 1, 1982
Subject Category
Aerospace Medicine
Accession Number
82A46329
Distribution Limits
Public
Copyright
Other

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