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Qualitative and Quantitative Evaluation of Muscle Fatigue by Muscle Stiffness

Research Project

Project/Area Number 06650470
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 計測・制御工学
Research InstitutionOkayama University

Principal Investigator

OKA Hisao  Faculty of Engineering, Okayama University, Associate Professor, 工学部, 助教授 (80116441)

Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1995: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1994: ¥1,300,000 (Direct Cost: ¥1,300,000)
Keywordsmusclc fatigue / EMG / objective muscle fatigue / viscoelasticity / mechanical impedance / vehicle seat / 血流
Research Abstract

The purpose of this study is to measure and estimate muscle fatigue utilizing muscle viscoelasticity change by sitting on a vehicle seat for a long period of time, which is calculated from the biomechanical impedance spectrum. This study deals with a change in muscle fatigue which is transitory, not chronic. An EMG (electromyogram), whose median frequency of spectrum decreases in muscle fatigue and a blood flow, with which a low back is congested, caused by a long time contact of skin surface are also measured in order to analyze the relation between muscle strain and muscle fatigue caused by a worse posture sitting on a vehicle seat.
In 1994, (1) measuring points were determined, which were apt to occur a change of muscle stiffness and (2) blood flow was measured. In 1995, (3) calculation of viscoelasticity of muscle and (4) EMG were measured, and the relation between muscle strain and fatigue caused by a worse posture was made clear. The summary is as follows : (1) muscle viscoelasticity changes around 40mm away from the right and left side of the spinal column between the 3rd and the 4th lumbar vertebra, and between the 4th and the 5th lumbar vertebra, when the biomechanical impedance of low back is measured by sitting on a worse vehicle seat for a long period of time. (2) blood flow changes slightly caused by a skin contact with seat in low back. (3) viscosity and elasticity, calculated from the mechanical impedance spectrum, increase with muscle fatigue. (4) integrated value of EMG increases and median frequency of EMG spectrum decreases in muscle fatigue.
Muscle fatigue was estimated by using Principle Component Analysis with the measured viscoelasticity and EMG,and a new objective muscle fatigue index was proposed. The index suggested an adequate correlation with a subjective fatigue which occurred in low back by sitting on standard and worse vehicle seat for a long period of time.

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (20 results)

All Other

All Publications (20 results)

  • [Publications] 岡 久雄: "機械インピーダンスを用いた生体の硬さ計測" バイメカニズム(東京大学出版会). 12. 15-25 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 岡 久雄: "Estimation of Body Structure by Biomechanical Impedance" IEICE Trans. Fundamentals. E77-A. 1872-1874 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 岡 久雄: "Correction of Apparent Viscoelasticity of Skin Surface" Memoirs Faculty Eng., Okayama Univ.29. 39-48 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 岡 久雄: "Estimation of Body Structure by Biomechanical Impedance" Memoirs Faculty Eng., Okayama Univ.29. 29-38 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 岡 久雄: "Estimation of Muscle Fatigue upon the Muscle Stiffness Change" Memoirs Faculty Eng., Okayama Univ.30(印刷中). (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 岡 久雄: "筋硬度変化による筋疲労の評価" バイオメカニズム学会誌. (印刷中). (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Hisao Oka and Takashi Irie: "Stiffness Estimation of Living Body by Mechanical Impedance" Biomechanisms 12 : Motor function of living body and its compensation, University of Tokyo Press. 15-25 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Hisao Oka, Masakazu Yasuna, Shun-ya Sakamoto and Takashi Fukuda: "Estimation of Body Structure by Biomechanical Impedance" IEICE Trans.Fundamentals. E77-A. 1872-1874 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Hisao Oka and Takashi Fukuda: "Estimation of Body Structure by Biomechanical Impedance" Memoirs Faculty Eng., Okayama Univ.29. 29-38 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Hisao Oka and Shun-ya Sakamoto: "Correction of Apparent Viscoelasticity of Skin Surface" Memoirs Faculty Eng., Okayama Univ.29. 39-48 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Hisao Oka and Shiro Fujiwara: "Estimation of Muscle Fatigue upon the Muscle Stiffness Change" Memoirs Faculty Eng., Okayama Univ.30 (in printing). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Hisao Oka and Shiro Fujiwara: "Estimation of Muscle Fatigue upon the Muscle Stiffness Change" Journal of the Society of Biomechanism. (in printing). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 岡 久雄: "Estimation of Body Structure by Biomechanical Impedance" Memoirs Faculty Eng.,Okayama Univ.29. 29-38 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 岡 久雄: "Correction of Apparent Viscoelasticity of Skin Surface" Memoirs Faculty Eng.,Okayama Univ.29. 39-48 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 岡 久雄: "Estimation of Muscle Fatigue upon the Muscle Stiffness Change" Memoirs Faculty Eng.,Okayama Univ.30(印刷中). (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 岡 久雄: "筋硬度変化による筋疲労の評価" バイオメカニズム学会誌. (印刷中). (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 岡 久雄: "機械インピーダンスを用いた生体の硬さ計測" バイオメカニズム(東京大学出版会). 12. 15-25 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 岡 久雄: "Estimation of Body Structure by Biomechanical Impedance" IEICE Trans.Fundamentals. E77-A. 1872-1874 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 岡 久雄: "Correction of Apparent Viscoelasticity of Skin Surface" Memoirs Faculty Eng.,Okayama Univ.29(印刷中). (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] 岡 久雄: "Estimation of Body Structure by Biomechanical Impedance" Memoirs Faculty Eng.,Okayama Univ.29(印刷中). (1995)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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