Thermoregulatory Responses to Low-Intensity Prolonged Swimming in Water at Various Temperatures and Treadmill Walking on Land

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概要

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• The purpose of the present study was to examine the effect of water temperature on the human body during low-intensity prolonged swimming. Six male college swimmers participated in this study. The experiments consisted of breast stroke swimming for 120 minutes in 23℃, 28℃ and 33℃ water at a constant speed of 0.4 m. sec^<-1> in a swimming flume. The same subjects walked on a treadmill at a rate of approximately 50% of maximal oxygen uptake (VO_2max) at the same relative intensity as the three swimming trials. Rectal temperature (Tre) in 33℃ water was unchanged during swimming for 120 minutes. Tre during treadmill walking increased significantly compared to the three different swimming trials. Tre, mean skin temperature (Tsk) and mean body temperature (Tb) in 23℃ and 28℃ water decreased significantly more than in both the 33℃ water and walking on land. VO_2 during swimming in 23℃ water increased more than during swimming in the 28℃and 33℃ trials; however, there were no significant differences in VO_2 between the 23℃ swimming trial and treadmill walking. Heart rate (HR) during treadmill walking on land increased significantly compared with HR during the three swimming trials. Plasma adrenaline concentration at the end of the treadmill walking was higher than that at the end of each of the three swimming trials. Noradrenaline concentrations at the end of swimming in the 23℃ water and treadmill walking were higher than those during the other two swimming trials. Blood lactate concentration during swimming in 23℃ water was higher than that during the other two swimming trials and walking on land. These results suggest that the balance of heat loss and heat production is maintained in the warm water temperature. Therefore, a relatively warm water temperature may be desirable when prolonged swimming or other water exercise is performed at low intensity.

• 日本生理人類学会の論文

著者

• Hotta Noboru

  Institute of Health Science, Kyushu University

• Fujishima Kazutaka

  Institute of Health Science, Kyushu University

• Hotta Noboru

  Institute Of Health Science Kyushu University

• Hotta Noboru

  Inst. Of Health Sci. Kyushu Univ.

• OGAKI Tetsuro

  Institute of Health Science, Kyushu University

• Shono Tomoki

  Beppu Women's Junior College

• Ueda Takeshi

  Fukuoka Prefectural University

• Shimizu Tomihiro

  Joetsu Education University

• Kanaya Syozo

  Sasebo Kyosai Hospital

• Fujishima Kazutaka

  Healthy Community Center A Non-profit Organization

• Fujishima Kazutaka

  Institute Of Health Science Kyushu University

• Ogaki Tetsuro

  Institute Of Health Science Kyushu University

• Shono Tomoki

  Beppu Women's Junior College

• Shono Tomoki

  Kyushu University Of Health And Welfare

• Ogaki Tetsuro

  Institute Of Health Dcience And Graduate School Of Human Environmental Studies Kyushu University

• OGAKI Tetsuro

  Kyushu Univ.

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