2004 Fiscal Year Final Research Report Summary
Quantitative approach for activation level of skeletal muscle during human daily life of aged peoples
| Project/Area Number |
15300227
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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 | Waseda University |
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Principal Investigator |
FUKUNAGA Tetsuo Waseda University, Faculty of Sport Sciences, Professor, スポーツ科学学術院・スポーツ科学部, 教授 (40065222)
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| Co-Investigator(Kenkyū-buntansha) |
KANEHISA Hiroaki University of Tokyo, Department of Life Sciences, Associate Professor, 生命環境科学系, 助教授 (50161188)
KAWAKAMI Yasuo Waseda University, Faculty of Sport Sciences, Professor, スポーツ科学部, 教授 (60234027)
KOUZAKI Motoki University of Tokyo, Department of Life Sciences, Research Associate, 生命環境科学系, 助手 (30313167)
KUBO Keitaro University of Tokyo, Department of Life Sciences, Research Associate, 生命環境科学系, 助手 (70323459)
FUKASHIRO Senshi University of Tokyo, Department of Life Sciences, Associate Professor, 生命環境科学系, 助教授 (50181235)
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| Project Period (FY) |
2003 – 2004
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| Keywords | electromyogram / muscle activity / aging / daily life |
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| Research Abstract |
In our previous studies, it has been observed that the aging induces the atrophy of muscle tissue and deterioration of muscle function. The muscle atrophy and deterioration of muscle strength was depend on the muscle groups, i.e.quardriceps femoris muscle indicated dominant atrophy and lowering the knee extension strength compared to other muscle groups. On the other hand, armmuscles such as elbow flexors and extensors indicated no changes independent of age. The differences for responsibility to the aging among muscle groups is considered for the muscle to activate with different levels in daily life. However, so far, there were no studies for the estimation of muscle activation level during daily life. The purpose of the present study is, therefore, to quantify the muscle activation levels during workaday life by means of electromyogram(EMG). EMG recordings during 10 hours a day were obtained from such 8 muscle groups as rectus abdominis, erector supinae, vustus femoris medialis, rectus femoris, vustus lateraris, biceps femoris, tibialis anterior, gastrocnemius medialis. To estimate the level of activation of muscle, we adopted the expression of %MVC (maximal voluntary contraction strength). In the case of normal workaday life, the measured EMG indicated relatively lower muscle activation during workaday life, i.e. every muscle groups activated lower than 30%MVC. It is considered that as to prevent muscle atrophy above 40%MVC is demanded as the effective training intensity, specially designed muscle activity should be added in daily life to keep muscle volume and function.
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