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Fluid shifts during thermal stress with and without fluid replacementSix unacclimatized men rested for 4 hr in a hot, dry environment without fluid replacement (DH). Another group of six men were exposed to the same thermal stress, replacing evaporative fluid loss with warm 0.1% NaCl solution (FRP). Total grams of circulating hemoglobin, determined by CO immediately prior to and again during the last minutes of heat exposure, increased an insignificant 1.6 and 1.3% during DH and FRP, respectively. With DH, body weight loss of 2.6% was accompanied by a 7.8% reduction in calculated plasma volume (PV). Even when body weight was maintained (FRP), PV decreased 2.9% during the heat exposure. Total circulating serum protein did not change as a result of the heat stress with either DH or FRP. In a test-retest series of experiments on four men, DH was not detrimental to sweat rate. It is shown that hemodilution is not a general response to acute heat exposure. The disproportionately large reduction in PV during thermal dehydration is confirmed.
Document ID
19770041510
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Myhre, L. G.
(Lovelace Foundation for Medical Education and Research Albuquerque, N. Mex., United States)
Robinson, S.
(Indiana University Bloomington, Ind., United States)
Date Acquired
August 8, 2013
Publication Date
February 1, 1977
Publication Information
Publication: Journal of Applied Physiology: Respiratory
Subject Category
Aerospace Medicine
Accession Number
77A24362
Funding Number(s)
CONTRACT_GRANT: NAS9-12572
CONTRACT_GRANT: DA-49-193-MD-2449
Distribution Limits
Public
Copyright
Other

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