Thermal and circulatory responses during exercise: effects of hypohydration, dehydration, and water intake

Lawrence E. Armstrong, Carl M. Maresh, Catherine V. Gabaree, Jay R. Hoffman, Stavros A. Kavouras, Robert W. Kenefick, John W. Castellani, and Lynn E. Ahlquist Human Performance Laboratory and Department of Physiology and Neurobiology, University of Connecticut, Storrs, Connecticut 06269-1110 Receive...

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Published in:Journal of applied physiology (1985) 1997-06, Vol.82 (6), p.2028-2035
Main Authors: Armstrong, Lawrence E, Maresh, Carl M, Gabaree, Catherine V, Hoffman, Jay R, Kavouras, Stavros A, Kenefick, Robert W, Castellani, John W, Ahlquist, Lynn E
Format: Article
Language:English
Subjects:
Adult
Biological and medical sciences
Blood Circulation
Body Temperature
Body Water - metabolism
Dehydration - physiopathology
Drinking
Exercise
Fundamental and applied biological sciences. Psychology
Hot Temperature
Humans
Male
Stress, Physiological - physiopathology
Vertebrates: body movement. Posture. Locomotion. Flight. Swimming. Physical exercise. Rest. Sports
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Summary:Lawrence E. Armstrong, Carl M. Maresh, Catherine V. Gabaree, Jay R. Hoffman, Stavros A. Kavouras, Robert W. Kenefick, John W. Castellani, and Lynn E. Ahlquist Human Performance Laboratory and Department of Physiology and Neurobiology, University of Connecticut, Storrs, Connecticut 06269-1110 Received 17 July 1996; accepted in final form 12 February 1997. Armstrong, Lawrence E., Carl M. Maresh, Catherine V. Gabaree, Jay R. Hoffman, Stavros A. Kavouras, Robert W. Kenefick, John W. Castellani, and Lynn E. Ahlquist. Thermal and circulatory responses during exercise: effects of hypohydration, dehydration, and water intake. J. Appl. Physiol. 82(6): 2028-2035, 1997. This investigation examined the distinct and interactive effects of initial hydration state, exercise-induced dehydration, and water rehydration in a hot environment. On four occasions, 10 men performed a 90-min heat stress test (treadmill walking at 5.6 km/h, 5% grade, 33°C, 56% relative humidity). These heat stress tests differed in pretest hydration [2 euhydrated (EU) and 2 hypohydrated (HY) trials] and water intake during exercise [2 water ad libitum (W) and 2 no water (NW) trials]. HY + NW indicated greater physiological strain than all other trials ( P  
ISSN:8750-7587
1522-1601
DOI:10.1152/jappl.1997.82.6.2028