2009 Fiscal Year Final Research Report
Respiratory and cardiovascular regulations during exercise in hypoxia
| Project/Area Number |
20700523
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Sports science
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| Research Institution | Nagoya University |
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Principal Investigator |
KATAYAMA Keisho Nagoya University, 総合保健体育科学センター, 准教授 (40343214)
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| Co-Investigator(Renkei-kenkyūsha) |
ISHIDA Koji 名古屋大学, 総合保健体育科学センター, 教授 (50193321)
SAITO Mitsuru 豊田工業大学, 工学部, 教授 (80126862)
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| Project Period (FY) |
2008 – 2009
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| Keywords | 低酸素環境 / 運動 / 呼吸循環 |
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| Research Abstract |
The purpose of the present study was to elucidate respiratory and cardiovascular responses at rest and during exercise in hypoxia. Study 1 ; the subjects breathed hypoxic gas mixture (12%O2) for 20 min. Flow-mediated vasodilation (FMD) was measured before and after hypoxic exposure. FMD was increased after acute hypoxia, suggesting that acute hypoxic exposure could improve endothelial function. Study 2 ; the subjects performed cycle exercise at 40% and 70% of maximal exercise intensity in normoxia (21%O2) and hypoxia (12.7%O2). Arterial blood pressure and muscle sympathetic nerve activity during exercise in hypoxia (hypoxic condition) differed from those in normoxia. These results suggest that arterial oxygenation could affect arterial blood pressure regulation during exercise.
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