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| IJCEM Copyright © 2008-All rights reserved. Published by e-Century Publishing Corporation, Madison, WI 53711 |
Int J Clin Exp Med 2013;6(8):683-687
Original Article
The effect of water temperature and voluntary drinking on the post rehydration
sweating
Abdollah Hosseinlou, Saeed Khamnei, Masumeh Zamanlu
Faculty of Medicine, Urmia University of Medical Sciences, Urmia, Iran; Department of Physiology, Azad Islamic University, Tabriz
Branch, Tabriz, Iran; Neuroscience Research Center, Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran
Received May 19, 2013; Accepted July 31, 2013; Epub September 1, 2013; Published September 15, 2013
Abstract: During heat stress and dehydration, thermoregulation is partly suppressed to save body fluid and circulation. Drinking
induces the recovery of thermoregulatory responses including sweating. Our objective is to investigate the effect of water temperature
and voluntary drinking on the extent of the drinking-induced sweating. Six healthy subjects 23.7 ± 0.6 yr old and 80.7 ± 5.7 kg wt were
dehydrated by performing mild exercise (ergometer cycling) in a hot and humid chamber (38-40°C, 20-28% relative humidity). After
dehydration, subjects were allowed to drink water with temperatures of 5, 16, 26, 58°C on four separate days. The sweating rate was
measured on the forehead area before and after drinking. Also, blood samples were collected during the experiments and plasma
osmolality was measured. Sweating increased markedly just a few minutes after the onset of drinking. The rate of this response was
lower in ingested water temperature of 5°C (0.43 ± 0.03 g, p = 0.000). Different intake occurred with different water temperatures
(respectively 4.2, 6.4, 3.1, 1.8 ml/kg). Water at 16°C induced higher intake (6.4 ml/kg) together with lower sweating (0.54 ± 0.03 g),
which can result in optimum level of hydration. Conclusion- When dehydrated subjects drink water with different temperatures, there
are different sweating responses together with different voluntary intakes. According to our results, consuming 16°C water, cool tap
water, could be suggested in dehydration. (IJCEM1305012).
Keywords: Drink temperature, perspiration, voluntary intake, thermoregulatory evaporation, drinking induced thermoregulatory
responses
Address correspondence to: Dr. Saeed Khamnei, Department of Physiology, Islamic Azad University, Tabriz Branch, Manzarieh St.,
Tabriz, Iran. Tel: 009844113364664; Fax: 009844113364664; E-mail: khamnei-s@iaut.ac.ir; khamnei_s@yahoo.com
Original Article
The effect of water temperature and voluntary drinking on the post rehydration
sweating
Abdollah Hosseinlou, Saeed Khamnei, Masumeh Zamanlu
Faculty of Medicine, Urmia University of Medical Sciences, Urmia, Iran; Department of Physiology, Azad Islamic University, Tabriz
Branch, Tabriz, Iran; Neuroscience Research Center, Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran
Received May 19, 2013; Accepted July 31, 2013; Epub September 1, 2013; Published September 15, 2013
Abstract: During heat stress and dehydration, thermoregulation is partly suppressed to save body fluid and circulation. Drinking
induces the recovery of thermoregulatory responses including sweating. Our objective is to investigate the effect of water temperature
and voluntary drinking on the extent of the drinking-induced sweating. Six healthy subjects 23.7 ± 0.6 yr old and 80.7 ± 5.7 kg wt were
dehydrated by performing mild exercise (ergometer cycling) in a hot and humid chamber (38-40°C, 20-28% relative humidity). After
dehydration, subjects were allowed to drink water with temperatures of 5, 16, 26, 58°C on four separate days. The sweating rate was
measured on the forehead area before and after drinking. Also, blood samples were collected during the experiments and plasma
osmolality was measured. Sweating increased markedly just a few minutes after the onset of drinking. The rate of this response was
lower in ingested water temperature of 5°C (0.43 ± 0.03 g, p = 0.000). Different intake occurred with different water temperatures
(respectively 4.2, 6.4, 3.1, 1.8 ml/kg). Water at 16°C induced higher intake (6.4 ml/kg) together with lower sweating (0.54 ± 0.03 g),
which can result in optimum level of hydration. Conclusion- When dehydrated subjects drink water with different temperatures, there
are different sweating responses together with different voluntary intakes. According to our results, consuming 16°C water, cool tap
water, could be suggested in dehydration. (IJCEM1305012).
Keywords: Drink temperature, perspiration, voluntary intake, thermoregulatory evaporation, drinking induced thermoregulatory
responses
Address correspondence to: Dr. Saeed Khamnei, Department of Physiology, Islamic Azad University, Tabriz Branch, Manzarieh St.,
Tabriz, Iran. Tel: 009844113364664; Fax: 009844113364664; E-mail: khamnei-s@iaut.ac.ir; khamnei_s@yahoo.com
