2002 Fiscal Year Final Research Report Summary
The effects of physical training on thermoregulatory responses from the viewpoint of skin sympathetic nerve activity
| Project/Area Number |
13680026
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
体育学
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| Research Institution | Kobe University |
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Principal Investigator |
KONDO Narihiko Faculty of Human Development, Associate Professor, 発達科学部, 助教授 (70215458)
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| Co-Investigator(Kenkyū-buntansha) |
NISHIYASU Takeshi University of Tsukuba, Health and physical education, Associate Professor, 体育科学系, 助教授 (90237751)
SAITO Mitsuru Toyota Technological Institute, engineering, Professor, 教授 (80126862)
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| Project Period (FY) |
2001 – 2002
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| Keywords | physical training / Thermoregulatory response / sweating response / skin blood flow response / skin sympathetic nerve activity |
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| Research Abstract |
To investigate the effect of physical training on thermoregulatory responses from the viewpoint of skin sympathetic nerve activity (SSNA), we have set two purposes in this study. 1) How is skin sympathetic nerve activity related to heat loss responses to a marked rise in internal temperature? 2) How is the relation between skin sympathetic nerve activity and heat loss responses influenced by physical training in humans? Each subject performed 10 consecutive days of exercise training in a temperature condition. This training consisted of cycle exercise of 90 min per day at 60% maximal oxygen uptake. Whole body heating by a water perfused-suit was performed until esophageal temperature (Tes) increased by about 1℃ before and after the training. The main results were obtained as follows:
1) There was good positive relation between Tes and SSNA as well as Tes-sweating rate (SR) and Tes-cutaneous vascular conductance (CVC) relationships.
2) There was good correlation between SSNA and heat losses. Moreover, the correlation coefficient was significantly higher in SR response than that in CVC response.
3) The training induced to increase maximal oxygen uptake of 5% and decrease resting HR and Tes.
4) The regression lines of Tes-SR, Tes-CVC and Tes-SSNA tended to be shifted to left by the training.
5) The regression lines of SSNA-SR and SSNA-CVC tended to be also shifted to left by the training.
These results suggest that the physical training in temperature condition may reduce a threshold for onset of activities of sweating, cutaneous vasodilation and skin sympathetic nerve. In addition, sweating and cutaneous vasodilation responses at a given skin sympathetic nerve activity may be enhanced by the training.
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