2006 Fiscal Year Final Research Report Summary
Mechanisms of reduction in exercise performance at an excessive increase in body temperature and countermeasures
| Project/Area Number |
16300208
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Sports science
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| Research Institution | Kobe University |
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Principal Investigator |
KONDO Narihiko Kobe University, Faculty of Human Development, Professor, 発達科学部, 教授 (70215458)
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| Co-Investigator(Kenkyū-buntansha) |
NISHIYASU Takeshi University of Thsukuba, Graduate School of Comprelensive Human Sciences, Associate Professor, 人間総合科学研究科, 助教授 (90237751)
KOGA Shunsaku Kobe Design University, Faculty of Design, Professor, デザイン学部, 教授 (50125712)
SAITO Mitsuru Toyota Technological Institute, Faculty of Engineering, Professor, 工学部, 教授 (80126862)
INOUE Yoshimitsu Osaka International University, Faculty of Human Sciences, Professor, 人間科学部, 教授 (70144566)
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| Project Period (FY) |
2004 – 2006
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| Keywords | thermoregulation / exercise performance / excessive body temperature / exercise training / heat acclimation |
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| Research Abstract |
An excessive increase in body temperature during exercise impairs exercise performance. One reason for the impaired performance might be the high body temperature itself. Alternatively, the high body temperature might affect the regulation of the pulmonary, cardiovascular, and nervous systems. Understanding these mechanisms could lead to ways to prevent reduction in exercise performance at high body temperatures. This study investigated the mechanisms that reduce exercise performance when an excessive increase in body temperature occurs, and possible countermeasures.
It has been reported that an excessive increase in body temperature influences brain activity directly. Increased skin blood flow and the dehydration associated with sweating induces cardiovascular drift during exercise. These negative factors cause a decline in exercise performance. In addition, this study identified other negative factors. First, the increase in muscle sympathetic nerve activity with a rise in body temperature may induce a reduction in blood flow to the exercised muscle. In addition, the facilitation of ventilation with a rise in body temperature causes a reduction in cerebral blood flow, which impairs exercise performance. However, there is a positive relationship between the facilitation of ventilation with increased body temperature and aerobic capacity, suggesting that exercise training would relieve this factor. Moreover, we have found that the degree of the reduction in exercise performance at high body temperatures is influenced by exercise experience in daily life. Therefore, ways oprevent the reduction in exercise performance with an excessive increase in body temperature include inhibiting the effect of rising body temperature on pulmonary, cardiovascular, thermoregulatory and nerve system and using exercise training.
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