2017 Fiscal Year Final Research Report
Effects of hyperventilation on corticospinal excitability of lower limb muscle during high-intensity exercise
| Project/Area Number |
26350694
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Developmental mechanisms and the body works
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| Research Institution | Hokkaido University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
大塚 吉則 北海道大学, 教育学研究院, 教授 (70233187)
松浦 亮太 上越教育大学, 大学院学校教育研究科, 准教授 (10551278)
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| Project Period (FY) |
2014-04-01 – 2018-03-31
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| Keywords | 呼吸 / 皮質脊髄路興奮性 / 高強度運動 / 随意呼吸 |
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| Outline of Final Research Achievements |
The aim of this study was to determine the relationship between hyperventilation and corticospinal excitability of lower limb muscle during high-intensity exercise. Motor-evoked potentials (MEPs) induced by transcranial magnetic stimulation were recorded in the vastus lateralis during cycling exercise to assess the corticospinal excitability of lower limb. MEPs were increased by voluntary breathing condition (VB) during low-intensity exercise (30%VO2max). On the other hand, there was no significant difference in MEPs between normal breathing condition (NB) and VB during high-intensity exercise (70-80%VO2max). In endurance trained subjects, MEPs decreased significantly during high-intensity exercise in NB. However, such a decrease in MEPs were not shown in VB. These results suggest that some parts of breathing during high-intensity exercise are caused by activation of the breathing-associated cortical areas, increasing corticospinal excitability of lower limb muscle.
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| Free Research Field |
運動生理学
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