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Stiffness estimation of ankle joint and leg muscles during quiet standing

Research Project

Project/Area Number 19K12791
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 90110:Biomedical engineering-related
Research InstitutionKeio University

Principal Investigator

Uchiyama Takanori  慶應義塾大学, 理工学部(矢上), 教授 (50243324)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords腓腹筋 / 前脛骨筋 / 弾性 / システム同定 / スティフネス / 外側広筋 / 足関節 / 膝関節 / 重心動揺 / 下腿筋 / 床反力
Outline of Research at the Start

直立時の足関節と下腿筋のスティフネスを同時に推定する方法を開発し,スティフネスの調節機構を明らかにする.床反力計の上に対象者を立たせ,下腿筋に電気刺激を与えて,重心の床への垂直投影である足圧中心点の変位を計測する.足圧中心点の変位から,電気刺激によって生じる足圧中心点の変位を抽出する.抽出した信号にシステム同定法を適用して,電気刺激を入力とし,足圧中心点の変位を出力とする伝達関数を求めてスティフネスを推定する.

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.

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.

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (6 results)

All 2021 2020 2019 Other

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (4 results) (of which Int'l Joint Research: 1 results) Remarks (1 results)

  • [Journal Article] Relationships among Electromyogram, Displacement and Velocity of the Center of Pressure, and Muscle Stiffness of the Medial Gastrocnemius Muscle during Quiet Standing2020

    • Author(s)
      Uchiyama Takanori、Kondo Gai
    • Journal Title

      Advanced Biomedical Engineering

      Volume: 9 Issue: 0 Pages: 138-145

    • DOI

      10.14326/abe.9.138

    • NAID

      130007885200

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Stiffness estimation of the vastus lateralis muscle in quiet standing2021

    • Author(s)
      Mizuki Ishii, Takanori Uchiyama
    • Organizer
      第60回日本生体医工学会大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Dependency of the medial gastrocnemius muscle and ankle joint stiffness on the dorsiflexion angle2021

    • Author(s)
      Masakiyo Oda, Takanori Uchiyama
    • Organizer
      第60回日本生体医工学会大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Relationship between the position andvelocity of the center of pressure andstiffness of the tibialis anterior muscleduring quiet standing2021

    • Author(s)
      Kengo Aoki, Takanori Uchiyama
    • Organizer
      生体医工学シンポジウム2021
    • Related Report
      2021 Annual Research Report
  • [Presentation] Relationship between Medial Gastrocnemius Muscle Stiffness and the Angle between the Rearfoot and Floor2019

    • Author(s)
      Takanori Uchiyama and Eiki Hamada
    • Organizer
      The 41st Annual International Conference of the IEEE Engineering in Medicine and Biology SocietyThe
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Remarks] 足関節と下腿の筋の粘弾性の解析

    • URL

      https://www.bi.appi.keio.ac.jp/?page_id=1830

    • Related Report
      2020 Research-status Report 2019 Research-status Report

URL: 

Published: 2019-04-18   Modified: 2023-01-30  

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