下腿の筋である腓腹筋および前脛骨筋に電気刺激を与えて，そのときの圧力中心（重心を床面に投影した点）の揺らぎを計測した．電気刺激を入力とし，圧力中心の揺らぎを出力とする伝達関数を同定して，筋および足関節の弾性を推定する方法を開発した．開発した方法を，静止立位時に適用し，腓腹筋の弾性が30から80N/mであること，また前脛骨筋の弾性も同程度であること，足関節の弾性は800 Nm/rad程度であることを明らかにした．
The center of pressure (COP), which is a vertical projection of the center of gravity, was measured using a force plated. We developed the method to estimate the muscle and ankle stiffness using an electrical stimulation and a system identification technique. The electrical stimulation was applied to the medial gastrocnemius muscle and the tibialis anterior muscle. The electrical stimulation was regarded as an input of the system. The electrically induced COP fluctuation was extracted and the fluctuation was regarded as an output of the system. The transfer function was identified and its natural frequencies were used to estimate the muscle and ankle stiffness. The stiffness of the medical gastrocnemius stiffness was 30 to 80 N/m and that of the tibialis anterior muscle also showed similar values. The ankle stiffness was approximately 800 Nm/rad.

研究種目 : 基盤研究 (C) (一般)
研究期間 : 2019～2021
課題番号 : 19K12791
研究分野 : 生体工学