Chirawat Paratthakonkun. Physiological responses to water supplementation of different temperatures during constant thermal exposure . Master's Degree(Sports Science). Mahidol University. : Mahidol University, 2003.
Physiological responses to water supplementation of different temperatures during constant thermal exposure
Abstract:
The objectives of this study were to compare the thermoregulatory (body
temperature, amount of sweat, and sensation to heat) and cardiorespiratory (blood
pressure, heart rate, and respiratory rate) responses after the drinking of water of
different temperatures by healthy Thai males during heat exposure. Nine volunteers
with average age of 22.11±0.72 years sat in the sauna cabin at average temperature of
63.09±0.61°C for 30 minutes. Subjects visited the laboratory on five occasions. With
random order of drinking water, subjects drank water of different temperatures:
ambient-temperature water, no water, 37°C water, ±4°C water, and ±50°C water after
10 minutes of sauna exposure. The aforementioned parameters, then, were measured
and recorded at five-minute intervals until the end of the experiment. The level for
statistical difference was set at α<0.05.
It was found that different temperatures of drinking water had influence on rectal
temperature. Ambient-temperature water did not affect temperature. Cool drinking
water decreased temperature, while rest of the water trials increased temperature.
There was no significant difference among different temperatures of drinking water on
skin temperature (p>0.05). The highest and the lowest sweating were seen in ±50°C
water and ±4°C water trial, respectively. There were no changes on heat sensation
(rating of perceived exertion and thermal sensation) when drinking water of different
temperatures. Drinking water of different temperatures caused blood pressures to
fluctuate. A remarkable decrease in heart rate was found in drinking ±4°C water.
Drinking no water made the respiratory rate to lower and then to remain constant. But
this had not happened in the other cases.