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JOURNAL
OF
SPORTS SCIENCE &
MEDICINE
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Research
article
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WATER TEMPERATURE, VOLUNTARY DRINKING AND FLUID BALANCE IN DEHYDRATED TAEKWONDO ATHLETES |
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Saeed Khamnei1, Abdollah Hosseinlou2 and Masumeh Zamanlu3  |
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1Department of Physiology, Tabriz Branch,, Islamic Azad University, Tabriz, Iran, 2Drug Applied Research Center, Tabriz University of Medical Sciences, Tabriz, Iran, 3Department of Physiology, Tabriz University of Medical Sciences, Tabriz, Iran |
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© Journal of Sports Science and Medicine (2011) 10, 718 - 724 |
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| ABSTRACT | |||
| Voluntary drinking is one of the major determiners of rehydration,
especially as regards exercise or workout in the heat. The present study
undertakes to search for the effect of voluntary intake of water with different
temperatures on fluid balance in Taekwondo athletes. Six young healthy male
Taekwondo athletes were dehydrated by moderate exercise in a chamber with
ambient temperature at 38-40°C and relative humidity between 20-30%. On
four separate days they were allowed to drink ad libitum plane water with
the four temperatures of 5, 16, 26, and 58°C, after dehydration. The volume
of voluntary drinking and weight change was measured; then the primary percentage
of dehydration, sweat loss, fluid deficit and involuntary dehydration were
calculated. Voluntary drinking of water proved to be statistically different
in the presented temperatures. Water at 16°C involved the greatest intake,
while fluid deficit and involuntary dehydration were the lowest. Intake
of water in the 5°C trial significantly correlated with the subject's plasma
osmolality change after dehydration, yet it showed no significant correlation
with weight loss. In conclusion, by way of achieving more voluntary intake
of water and better fluid state, recommending cool water (~16°C) for athletes
is in order. Unlike the publicly held view, drinking cold water (~5°C) does
not improve voluntary drinking and hydration status. Key words: Fluid intake; exercise in the heat; involuntary dehydration; fluid deficit. |
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