2021 Fiscal Year Final Research Report
Stiffness estimation of ankle joint and leg muscles during quiet standing
| Project/Area Number |
19K12791
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 90110:Biomedical engineering-related
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| Research Institution | Keio University |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 腓腹筋 / 前脛骨筋 / 弾性 / システム同定 |
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| Outline of Final Research Achievements |
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.
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| Free Research Field |
生体工学
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| Academic Significance and Societal Importance of the Research Achievements |
立位は人に特徴的で基本的な姿勢であり，その維持には下肢筋の活動と弾性が深く関わっている．下肢筋の活動は筋電図を用いて知ることができるものの，弾性を立位で計測する方法は存在しなかった．本研究では，立位時の下肢筋の弾性を推定する方法を開発した．本研究で計測した立位姿勢を維持しているときの圧力中心の動揺は，老化やパーキンソン病などの疾病によって応答が変化することが知られており，これらと姿勢維持のためのアクチュエータである筋および関節の弾性の関係を明らかにすることができる．
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