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Heat acclimatization and hydration status of American football players during initial summer workouts


Yeargin, SW and Casa, DJ and Armstrong, LW and Watson, G and Judelson, DA and Psathas, E and Sparrow, SL, Heat acclimatization and hydration status of American football players during initial summer workouts, Journal of Strength and Conditioning Research: The Research Journal of The National Strength and Conditioning Association, 20, (3) pp. 463-470. ISSN 1064-8011 (2006) [Refereed Article]

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Copyright 2006 National Strength & Conditioning Association

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DOI: doi:10.1519/00124278-200608000-00002


This investigation evaluated the new National Collegiate Athletic Association model of heat acclimatization for football players using physiological, psychological, fluid balance, anthropometric, and nutritional variables. Eleven football players (20 +/- 1 year, 1.88 +/- 0.05 m, and 115.36 +/- 18.85 kg) from a Division I football team were observed for the first 8 days of preseason practices. Measurements such as heart rate and gastrointestinal temperature (T(GI)) via telemetric sensor were taken before, 3 times during, and after practice daily. An average 1.39-kg (1.2%) decrease of body mass occurred from prepractice to postpractice (p < 0.01). Consistent with mild body mass losses, urinary indices of hydration status (i.e., color, specific gravity, and osmolality) indicated mild fluid deficits. A significant increase (p < 0.05) from pre- to postpractice was observed in urine color and urine specific gravity, but chronic hypohydration over the 8 days was not noted. The Environmental Symptoms Questionnaire (ESQ) postpractice score was significantly higher (p < 0.05) than the prepractice score was, but averages did not differ across practice days. There was no difference in postpractice T(GI) measurements across days (p < 0.05). Heart rate, T(GI), and ESQ measurements indicated that football players experienced gradual heat acclimatization and enhanced heat tolerance, despite progressive increases of exercise variables, clothing, and environmental stressors

Item Details

Item Type:Refereed Article
Research Division:Health Sciences
Research Group:Sports science and exercise
Research Field:Exercise physiology
Objective Division:Health
Objective Group:Evaluation of health and support services
Objective Field:Evaluation of health and support services not elsewhere classified
UTAS Author:Watson, G (Dr Greig Watson)
ID Code:78809
Year Published:2006
Web of Science® Times Cited:58
Deposited By:Health Sciences A
Deposited On:2012-07-27
Last Modified:2012-09-06
Downloads:2 View Download Statistics

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