Mechanisms of potentiation in sweating induced by long-term physical training |
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Authors: | Fumio Yamazaki Nobuharu Fujii Ryoko Sone Haruo Ikegami |
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Institution: | (1) Doctoral Programme in Health and Sport Sciences, University of Tsukuba, 305 Tsukuba, Ibaraki, Japan;(2) Institute of Health and Sport Sciences, University of Tsukuba, 305 Tsukuba, Ibaraki, Japan;(3) Present address: Department of Physiology, School of Medicine, University of Occupational and Environmental Health, 1-1 Iseigaoka, 807 Yahatanishi-ku, Kitakyushu, Japan |
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Abstract: | To evaluate the mechanism of potentiation of sweating after long-term physical training, we compared sweating function in trained and untrained subjects using the frequency of sweat expulsion (f
sw) as an indicator of central sudomotor activity. Nine trained male subjects (trained group) and eight untrained male subjects (untrained group) performed 30-min cycle exercise at 35% maximal oxygen uptake at 25°C ambient temperature and 35% relative humidity. Oesophageal temperature (T
oes), mean body temperature
b, chest sweating rate (
sw,chest), forearm sweating rate (
forearm), andf
sw were measured. The slopes of the
sw,chest versus body temperature (T
oes and
b) and versusf
sw relationships in the trained group were significantly greater than those in the untrained group (both,P < 0.05), while there was no difference between the groups in the slopes of the
sw,chest versus body temperature or versusf
sw relationships. Neither the body temperature threshold for initiation of chest or forearm sweating nor the slope of thef
sw-
b relationship differed between groups. We concluded that, during light exercise at moderate ambient temperature, the
sw,chest in the subjects who had undergone long-term physical training was greater than that in the untrained subjects while the
sw,forearm was not changed. The greater
sw,chest in the trained subjects was concluded to be due to an increase of sensitivity of peripheral mechanisms. |
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Keywords: | Body temperature Sweating rate Central sudomotor activity Physical conditioning |
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