The effect of diurnal variation on the regional differences in sweating and skin blood flow during exercise |
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Authors: | Ken Aoki Tomoyuki Shiojiri Manabu Shibasaki Seiji Takano Narihiko Kondo Atsushi Iwata |
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Institution: | (1) Division of Education, Graduate School, Kobe University, Japan;(2) Faculty of Human Life Science, Osaka City University, Japan;(3) Faculty of Human Development, Kobe University, 3-11 Tsurukabuto, 657 Nada-Ku, Kobe, Japan |
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Abstract: | The aim of the present study was to examine changes in the control of heat-dissipation responses to exercise associated with the diurnal variation in core temperature from the viewpoint of the regional response patterns. We studied seven men during exercise on a cycle ergometer at 100 W for 40 min at 25°C at 0630 (morning) 1630 (evening) hours on 2 separate days. Oesophageal temperature (T
oes), local skin temperature, local sweating rate (
) on the forehead, back, forearm and thigh, and skin blood flow by laser Doppler flowmeter (LDF) on the back and forearm were measured continuously. TheT
oes at rest was significantly higher in the evening than in the morning, the difference averaging approximately 0.4°C (P < 0.05). TheT
oes thresholds for each site in
and that for back in LDF were significantly different between the two times of day (P < 0.05). The change inT
oes thresholds for sweating and vasodilatation for morning and evening were similar toT
oes at rest. Although
on the forehead was significantly higher in the morning than in the evening,
on the back was significantly higher in the evening than in the morning (P < 0.05). Total local sweating rate (
) for each site during exercise was significantly higher on the forehead than on the forearm in the morning, and on the back than on the forearm in the evening, respectively (P < 0.05). The results would suggest that the diurnal variation of heat-dissipation responses to exercise is influenced not only by a central controlling mechanism but also by changes in the regional differences. |
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Keywords: | Diurnal variation Sweating rate Skin blood flow Regional difference |
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