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head-out water F. WADA, S. SAGAWA, K. MIKI, K. NAGAYA, S. NAKAMITSU, K. SHIRAKI, AND J. E. GREENLEAF Department of Physiology, School of Medicine, University of Occupational and Environmental Health, 807 Kitakyushu, Japan; and Laboratory for Human Environmental Physiology, Life Science Division, National Aeronautics and Space Administration, Ames Research Center, Moffett Field, California 94035-l 000 Wada, F., S. Sagawa, K. Miki, K. Nagaya, S. Nakamitsu, K. Shiraki, and J. E. Greenleaf. Mechanism of head-out water in men. Am. J. Physiol. 268 (Regulatory Integrative Comp. Physiol. 37): R583-R589, 1995.-The purpose was to determine whether extracellular volume or osmolality was the major contributing factor for reduction of in air and head-out water in hypohydrated subjects. Eight males (1925 yr) were subjected to thermoneutral and thermoneutral air under two hydration conditions without further drinking: euhydration in water (Eu-H20) and euhydration in air, and hypohydration in water (Hypo-H20) and hypohydration in air (3.7% wt loss after exercise in heat). The increased sensation with Hypo-Hz0 decreased (P < 0.05) within 10 min of and continued thereafter. Mean plasma osmolality (288 t 1 mosmol/kgH,O) and sodium (140 2 1 meq/l) remained elevated, and plasma volume increased by 4.2 2 1.0% (P < 0.05) throughout
AJP - Regulatory, Integrative and Comparative Physiology – The American Physiological Society
Published: Mar 1, 1995
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