title: The effect of water temperature and voluntary drinking on the post rehydration sweating.
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.
authors.affiliation: Faculty of Medicine, Urmia University of Medical Sciences Urmia, Iran.
authors.forename: Abdollah
authors.initials: A
authors.lastname: Hosseinlou
authors.forename: Saeed
authors.initials: S
authors.lastname: Khamnei
authors.forename: Masumeh
authors.initials: M
authors.lastname: Zamanlu
keywords: Drink temperature; drinking induced thermoregulatory responses; perspiration; thermoregulatory evaporation; voluntary intake
references.citation: J Basic Clin Physiol Pharmacol. 1998;9(1):51-72
references.pmid: 9793803
references.citation: J Physiol. 1989 Oct;417:421-35
references.pmid: 2621603
references.citation: Vet J. 2004 Jan;167(1):72-80
references.pmid: 14623154
references.citation: Physiol Behav. 1984 May;32(5):851-5
references.pmid: 6494291
references.citation: Can J Appl Physiol. 1997 Oct;22(5):479-93
references.pmid: 9356766
references.citation: Am J Physiol. 1995 Feb;268(2 Pt 2):R414-22
references.pmid: 7864236
references.citation: J Appl Physiol. 1965 Sep;20(5):975-9
references.pmid: 5837625
references.citation: Jpn J Physiol. 1986;36(2):253-66
references.pmid: 3735792
references.citation: Exerc Sport Sci Rev. 1984;12:339-72
references.pmid: 6376137
references.citation: Int J Hyperthermia. 2006 Mar;22(2):135-47
references.pmid: 16754597
references.citation: J Sports Sci. 2007 Jul;25(9):975-85
references.pmid: 17497398
references.citation: Physiol Behav. 1989 Mar;45(3):639-47
references.pmid: 2756057
references.citation: Can J Appl Physiol. 1999 Apr;24(2):188-200
references.pmid: 10198144
references.citation: J Sports Sci. 2008 Apr;26(6):583-90
references.pmid: 18344129
references.citation: Am J Physiol. 1997 Jun;272(6 Pt 2):R1740-6
references.pmid: 9227585
references.citation: Am J Physiol. 1993 Jun;264(6 Pt 2):R1200-5
references.pmid: 8322974
references.citation: Am J Physiol. 1981 Apr;240(4):E394-401
references.pmid: 7013497
references.citation: Am J Physiol Regul Integr Comp Physiol. 2009 Jun;296(6):R1881-8
references.pmid: 19297542
references.citation: J Sports Sci Med. 2011 Dec 01;10(4):718-24
references.pmid: 24149564