| Project/Area Number |
03671082
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
医学一般
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| Research Institution | University of Tokyo |
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Principal Investigator |
WATANABE Akira Faculty of Medicine, University of Tokyo, Associate Professor, 医学部(医), 助教授 (00009937)
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| Co-Investigator(Kenkyū-buntansha) |
IKEDA Kenji Faculty of Medicine, University of Tokyo, Instructor, 医学部(医), 助手 (70010030)
SAITO Masao Faculty of Medicine, University of Tokyo, Professor, 医学部(医), 教授 (60010708)
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| Project Period (FY) |
1991 – 1992
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| Project Status |
Completed (Fiscal Year 1992)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1992: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1991: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Keywords | Tremor / Motor control / Biomechanics / Model |
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| Research Abstract |
The objective of the present study is to develop the basic technique of analyzing physiological tremor by mechanical driving and of estimating related motor control parameters. First, we measured the hand response to forced oscillation over the frequency range of interest and performed simulation using our two-reflex-loop model of physiological tremor. In the experiment the wrist was fixed to a vibrator with an adapter. The acceleration of the wrist and the response of the pronated hand were measured by using two lightweight semiconductor accelerometers. Bipolar EMG signals were also recorded. Systematic changes with frequency were exhibited by the phase angles between the two acceleration signals and between the hand acceleration and rectified and filtered EMG signals. The experimental results compare well with simulation results based on the model. Secondly, we looked at the characteristics of mechanical parameters, because the reliability of total parameter estimation depends on the accuracy of mechanical parameter estimation. We measured the frequency and time constant of damped oscillation of the hand induced by a mechanical tap. The damping coefficient and elasticity were calculated as a function of the inertial load by using the moment of inertia estimated by anthropometrical measurements. The damping coefficient is found to be nearly proportional to the moment of the gravitational force exerted by the weight of the hand and load. This implies that the effect of muscle damping can be described by a single parameter, i.e. the slope of the line, which is convenient for parameter estimation.
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