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Fluid-electrolyte shifts and thermoregulation - Rest and work in heat with head coolingThe effects of head cooling on thermoregulation and associated plasma fluid and electrolyte shifts during rest and submaximal exercise in the heat are investigated. Thermoregulatory responses and plasma volume were measured in four male subjects fitted with liquid-cooled neoprene headgear during 60 min of rest, 60 min of ergometer exercise at 45% maximal oxygen uptake and 30 min of recovery in the supine position at 40.1 C and 40% relative humidity. It is found that, compared to control responses, head cooling decreased thigh sweating and increased mean skin temperature at rest and attenuated increases in thigh sweating, heart rate, rectal temperature and ventilation during exercise. During recovery, cooling is observed to facilitate decreases in sweat rate, heart rate, rectal temperature and forearm blood flow and enhance the increase in average temperature. Cooling had no effect on plasma protein, osmotic or electrolyte shifts, and decreased plasma volume losses. The findings indicate the effectiveness of moderate head cooling for the improvement of human performance during exercise in heat.
Document ID
19800063916
Document Type
Reprint (Version printed in journal)
Authors
Greenleaf, J. E.
(NASA Ames Research Center Moffett Field, CA, United States)
Van Beaumont, W.
(NASA Ames Research Center Moffett Field, CA, United States)
Brock, P. J.
(NASA Ames Research Center Moffett Field, CA, United States)
Montgomery, L. D.
(NASA Ames Research Center Moffett Field, CA, United States)
Morse, J. T.
(NASA Ames Research Center Moffett Field, CA, United States)
Shvartz, E.
(NASA Ames Research Center Moffett Field, CA, United States)
Kravik, S.
(NASA Ames Research Center Biomedical Research Div., Moffett Field, Calif., United States)
Date Acquired
August 10, 2013
Publication Date
August 1, 1980
Subject Category
Aerospace Medicine
Distribution Limits
Public
Copyright
Other
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