| Project/Area Number |
16560235
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Intelligent mechanics/Mechanical systems
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| Research Institution | Hokkaido University of Education |
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Principal Investigator |
WATAKABE Makoto Hokkaido University of Education, Faculty of Education, Associate Professor, 教育学部旭川校, 助教授 (70182946)
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| Co-Investigator(Kenkyū-buntansha) |
MITA Katsumi Kawasaki University of Medical Welfare, Faculty of Health Science and Technology, Professor, 医療技術学部, 教授 (40100169)
AKATAKI Kumi Osaka Electro-Communication University, Faculty of Biomedical Engineering, Professor, 医療福祉工学部, 教授 (30280811)
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| Project Period (FY) |
2004 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2005: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 2004: ¥2,100,000 (Direct Cost: ¥2,100,000)
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| Keywords | Mechanomyogram / Muscle activity / Joint angle / Muscle length / Transducers / Mechanical property / Simulator |
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| Research Abstract |
The aim of this study was twofold. First, one was to examine the effects of length changes on the muscular activities, using the mechanomyogram (MMG), electromyogram (EMG), and force output during isometric ramp contractions of the ankle dorsiflexor, tibialis anterior. The relationships between the root-mean-squared amplitude (RMS) of the MMG and relative force (% MVC) in the dorsiflexed ankle and plantarflexed ankle were markedly different from those in the neutral positioned ankle. Although the RMS amplitude of EMG in the dorsiflexed ankle demonstrated the wide difference from those in the neutral positioned ankle, those in the plantarflexed ankle showed the almost same pattern as in the neutral positioned ankle. These changes in EMG and MMG would suggest that the changes in length of muscle probably influence the muscle activation pattern during isometric ramp contraction. Second was to estimate the influence of the mechanical properties of the transducer on the MMG characteristics.
… More
The MMG signal was gradually distorted when the weight of the transducer became heavier : the addition of 4 g substantially attenuated the MMG signal. The mechanical properties of a microphone transducer were determined by the mechanical vibration test and compared with that of the MMG signal during voluntary contraction or electrically evoked twitch contraction. The estimated sensitivity of the microphone transducer was different during voluntary contraction from that in the mechanical test. The difference might be due to the skin deformation. During the voluntary contraction, the MMG from the microphone transducer reflected almost the displacement of the MMG. However, The waveforms from the microphone transducer during twitch contraction appear to reflect the velocity of the MMG. The frequency response of the microphone transducer, which could be characterized as the high-pass filter with 10 Hz cut-off frequency, might be responsible for this discrepancy. Finally, a vibration mechanism was developed to simulate the MMG behavior on flexible body surface. Less
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