| Project/Area Number |
17K13129
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Developmental mechanisms and the body works
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| Research Institution | University of Marketing and Distribution Sciences |
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Principal Investigator |
SEKI Kazutoshi 流通科学大学, 人間社会学部, 准教授 (30552210)
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | 力発揮調整能 / 脊髄α運動ニューロン / 運動習慣 / 加齢 / F波出現頻度 / 力発揮調節能 / F波 |
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| Outline of Final Research Achievements |
The purpose of this study was to clarify that the excitability of the spinal α-motor neurons associated with force adjustment based on 1) exercise habits and 2) aging.
The effects of exercise habits and aging were observed in each case the following conditions: 1) an isometric muscle strength maintenance task, 2) a gradual muscle strength increase/decrease task, and 3) task to perform gripping exercise after increasing or decreasing the force after isometric gripping exercise. The F-wave appearance frequency was higher in the group without exercise habits than the group with exercise habits, additionally in the elderly group compared to the young group. In addition, the F-wave appearance frequency appearance after exercise returned to rest level in the younger group, however, the excitability of the spinal α-motor neurons remained high in the elderly group. These results suggested that exercise habits and aging affect the excitability of the spinal α-motor neurons.
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| Academic Significance and Societal Importance of the Research Achievements |
力発揮の調整能力およびそれらを制御する運動神経の働きは、①一定筋力維持や②筋力の漸増・漸減および③一定筋力の維持から筋力の増大・減少課題において、各々運動習慣や加齢による差が観察された。また、力発揮直後においても運動習慣の有無、加齢の影響を受けることが明らかになった。特に、運動習慣の有無に限らず、高齢者は若年者と比べて、力発揮直後に、安静レベルまで運動神経の働きが戻らず、残存することが明らかとなった。
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