Effects of Kendo Uniform and Protectors on Body Temperatures and Dehydration during Exercise in Hot Environment

Autor: Mitsuo Matsuda, Takahiro Waku, Hideaki Fujino, Akira Kozawa, Makoto Saito, Mami Yanagawa
Rok vydání: 1998
Předmět:
Zdroj: Journal of Japan Society of Sports Industry. 8:1-9
ISSN: 1884-2534
1343-0688
Popis: We have previously reported that a marked increase in body temperature was induced by cycle ergometer exercise with kendo uniform and protectors in a hot environment. In the present study, to examine the effects of the weight of kendo uniform and protectors on heat production, we imposed treadmill exercise on 5 male college kendo fencers. The subjects performed treadmill exercises of 30 min duration at an intensity of 90% of their individual ventilatory threshold with shorts (Trial I) and with kendo uniform and protectors (weight: 7.5kg, Trial II) in hot environment {Trial I: a dry bulb temperature of 30.3 (SD: 0.2)°C, a wet bulb temperature of 24.9 (0.2)°C, a WBGT of 26.5 (0.2)°C ; Trial II; a dry bulb temperature of 30.0 (0.2)°C, a wet bulb temperature of 26.5 (0.5)°C, a WBGT of 26.9 (0.4)°C}. The environment and the duration and intensity of the exercise were about the same as the cycle exercise in our previous study. In Trial I, tympanic temperature and skin temperature did not change significantly during and after the exercise, compared to the initial state. In Trial II, however, those temperatures showed significant increases during and after the exercise. Although body weight was significantly decreased after both exercises, the rate of change in body weight was significantly higher in Trial II than in Trial I. The body weight loss after the exercise with uniform and protectors was more marked in the present study (2.6%), compared to that in the previous study (1.3%) performed with a cycle exercise. The heart rate and oxygen consumption during exercise were significantly higher in Trial II than in Trial I. We conclude that kendo uniforms and protectors hasten an increase in body temperature and dehydration during exercise, probably due not only to the insulation of heat dissipation but also to added heat production by their weight.
Databáze: OpenAIRE
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