Voluntary drinking and hydration in trained, heat-acclimatized girls exercising in a hot and humid climate

This study examined the effects of beverage composition on the voluntary drinking pattern, body fluid balance and body temperature responses of heat-acclimatized trained girls exercising intermittently in outdoor conditions (WBGT = 30.9 ± 0.2°C). Twelve trained, heat-acclimatized girls (age = 10.6 ±...

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Bibliographic Details
Published in:European journal of applied physiology 2008-05, Vol.103 (1), p.109-116
Main Authors: Rivera-Brown, Anita M., Ramírez-Marrero, Farah A., Wilk, Boguslaw, Bar-Or, Oded
Format: Article
Language:English
Subjects:
Acclimatization - physiology
Biomedical and Life Sciences
Biomedicine
Body temperature
Body Temperature - physiology
Carbohydrate Metabolism - physiology
Carbohydrates
Child
Children & youth
Dehydration - physiopathology
Dehydration - prevention & control
Drinking Behavior - physiology
Exercise
Exercise - physiology
Female
Heat
Hot Temperature
Human Physiology
Humans
Humidity
Hydration
Occupational Medicine/Industrial Medicine
Original Article
Outdoors
Oxygen Consumption - physiology
Physical fitness
Sodium Chloride - metabolism
Sports Medicine
Sweating
Sweating - physiology
Tropical Climate
Water-Electrolyte Balance - physiology
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Summary:This study examined the effects of beverage composition on the voluntary drinking pattern, body fluid balance and body temperature responses of heat-acclimatized trained girls exercising intermittently in outdoor conditions (WBGT = 30.9 ± 0.2°C). Twelve trained, heat-acclimatized girls (age = 10.6 ± 0.2 years) performed three 3-h sessions, each consisting of four 20-min cycling bouts at 60% V O 2 max, alternating with 25-min rest. One of three beverages was assigned: unflavored water (W), flavored water (FW) or flavored water plus 6% carbohydrate and 18 mmol/l NaCl (CNa). Drinking was ad libitum. Total intake was similar among conditions ( W  = 953.3 ± 107.8 ; FW = 1026.5 ± 138.1; CNa = 906.4 ± 107.5 g). A mild hypohydration occurred during the three conditions (W = −1.12%; FW = −0.95%; CNa = −0.74% BW, P  > 0.05). Sweat loss, higher than previously reported for sedentary girls, was not different among conditions ( W  = 1,051.5 ± 90.8; FW = 979.9 ± 72.8; CNa = 1,052.7 ± 52.6 g). The average amount of urine produced ( W  = 269.8 ± 85.9; FW = 320.8 ± 87.2; CNa = 85.6 ± 9.3 g) was 73 and 68% higher during FW and W , respectively, compared to CNa (CNa vs. FW, P  
ISSN:1439-6319
1439-6327
DOI:10.1007/s00421-008-0682-1