A Myokinetic Arm Model for Estimating Joint Torque and Stiffness From EMG Signals During Maintained Posture
書誌事項
- 公開日
- 2009-01
- DOI
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- 10.1152/jn.00584.2007
- 公開者
- American Physiological Society
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説明
<jats:p>The perturbation method has been used to measure stiffness of the human arm with a manipulator. Results are averages of stiffness during short perturbation intervals (<0.4 s) and also vary with muscle activation. We therefore propose a novel method for estimating static arm stiffness from muscle activation without the use of perturbation. We developed a mathematical muscle model based on anatomical and physiological data to estimate joint torque solely from EMG. This model expresses muscle tension using a quadratic function of the muscle activation and parameters representing muscle properties. The parameters are acquired from the relation between EMG and measured torque. Using this model, we were able to reconstruct joint torque from EMG signals with or without co-contraction. Joint stiffness is directly obtained by differentiation of this model analytically. We confirmed that the proposed method can be used to estimate joint torque, joint stiffness, and stiffness ellipses simultaneously for various postures with the same parameters and produces results consistent with the conventional perturbation method.</jats:p>
収録刊行物
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- Journal of Neurophysiology
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Journal of Neurophysiology 101 (1), 387-401, 2009-01
American Physiological Society
