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Development of Shoe Soles and Flooring Materials for Fall Prevention Based on Elucidation of Friction-Induced Slip and Trip Fall Mechanisms

Research Project

Project/Area Number 20H04558
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 90150:Medical assistive technology-related
Research InstitutionTohoku University

Principal Investigator

Yamaguchi Takeshi  東北大学, 工学研究科, 教授 (50332515)

Co-Investigator(Kenkyū-buntansha) 柴田 圭  独立行政法人労働者健康安全機構労働安全衛生総合研究所, リスク管理研究グループ, 任期付研究員 (60612398)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
Fiscal Year 2022: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2021: ¥10,920,000 (Direct Cost: ¥8,400,000、Indirect Cost: ¥2,520,000)
Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords転倒 / すべり / つまずき / 高齢者 / 摩擦 / 神経筋骨格モデル / 転倒予防
Outline of Research at the Start

平均寿命の増加に伴い高齢者転倒防止が社会全体の危急の課題となっている.高齢者はすり足歩行になりやすく,そのため足底と床面間の摩擦や摩擦の変化が歩行の安定性に大きく影響する.すなわち,摩擦が低すぎれば「すべり転倒」が生じやすく,高すぎれば前方への「つまずき転倒」が生じやすくなると考えられる.本研究では,神経筋骨格モデルを用いた歩行シミュレーションと歩行実験に基づいて,歩行中のすべり転倒やつまずき転倒を防止し,安全かつ安定な歩行を可能とする足底と床面間の摩擦係数の好適範囲の解明を行う.さらに,この知見に基づいて,すべり転倒・つまずき転倒の双方を抑制可能な靴底材料・床材料の開発を行う.

Outline of Final Research Achievements

In this study, we have found through walking experiments and gait simulation using a neuromusculoskeletal gait model of bipedal walking that there is an optimal range of friction coefficients between the foot sole and the floor that prevents slip- and trip-induced falls in the shuffling gait observed in elderly people, and that this range is between 0.4 and 1.1. It was also shown that the above optimum range of friction coefficients can be achieved by filling the rubber with plant-based porous carbon particles and by controlling the radius of the corner of the end face of the rectangular rubber block, even under water-lubricated and oil-lubricated conditions, which tend to cause low friction.

Academic Significance and Societal Importance of the Research Achievements

本研究は,高齢者にみられるすり足歩行において,すべり転倒及びつまずき転倒が生じない靴底と床面間の摩擦係数の範囲を明らかにするとともに,これらの摩擦係数の範囲を乾燥状態,水濡れ・油濡れ状態において実現可能なゴム複合材料の開発ならびに意匠設計に成功したものである.本研究は,高齢者の転倒防止のための靴底や床材料の開発につながる点で社会的意義が高く,さらに,安定歩行のための足底と床面間の摩擦の役割について,本質的な理解を与えるものであり,学術的意義も高いといえる.

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (19 results)

All 2023 2022 2021 2020 Other

All Int'l Joint Research (2 results) Journal Article (6 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 4 results,  Open Access: 2 results) Presentation (11 results) (of which Int'l Joint Research: 4 results,  Invited: 2 results)

  • [Int'l Joint Research] KITE Research Institute(カナダ)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] Toronto Rehabilitation Institute(カナダ)

    • Related Report
      2020 Annual Research Report
  • [Journal Article] Effect of the end-face corner radius of a rubber block on the friction coefficient and fluid-free gap under glycerin lubrication2023

    • Author(s)
      Ishizako Arata、Matsumoto Hide、Yamaguchi Takeshi
    • Journal Title

      Tribology International

      Volume: 184 Pages: 108473-108473

    • DOI

      10.1016/j.triboint.2023.108473

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Impact of rubber block end-face corner radius on the friction coefficient between rubber blocks and a glass plate under dry and lubrication conditions2022

    • Author(s)
      Ishizako Arata、Tomosada Masaki、Hokkirigawa Kazuo、Yamaguchi Takeshi
    • Journal Title

      Tribology International

      Volume: 174 Pages: 107705-107705

    • DOI

      10.1016/j.triboint.2022.107705

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Effects of age on dynamic balance measures and their correlation during walking across the adult lifespan2022

    • Author(s)
      Yamaguchi Takeshi、Masani Kei
    • Journal Title

      Scientific Reports

      Volume: 12 Issue: 1

    • DOI

      10.1038/s41598-022-18382-7

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Effect of foot-floor friction on the external moment about the body center of mass during shuffling gait: a pilot study2021

    • Author(s)
      Yamaguchi Takeshi、Shibata Kei、Wada Hiromi、Kakehi Hiroshi、Hokkirigawa Kazuo
    • Journal Title

      Scientific Reports

      Volume: 11 Issue: 1 Pages: 12133-12133

    • DOI

      10.1038/s41598-021-91683-5

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] The Future of Footwear Friction2021

    • Author(s)
      Beschorner Kurt E.、Li Yue、Yamaguchi Takeshi、Ells William、Bowman Richard
    • Journal Title

      Proceedings of the 21st Congress of the International Ergonomics Association (IEA 2021)

      Volume: 223 Pages: 841-855

    • DOI

      10.1007/978-3-030-74614-8_103

    • ISBN
      9783030746131, 9783030746148
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Journal Article] Effects of Foot-Floor Friction on Trip-Induced Falls During Shuffling Gait: A Simulation Study2021

    • Author(s)
      Yamaguchi Takeshi、Nakatani Kenichi、Hirose Tomoki、Yoshida Takashi、Masani Kei
    • Journal Title

      Proceedings of the 21st Congress of the International Ergonomics Association (IEA 2021)

      Volume: 223 Pages: 856-860

    • DOI

      10.1007/978-3-030-74614-8_104

    • ISBN
      9783030746131, 9783030746148
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Impact of foot-floor friction on falls in the elderly: a computational simulation using neuromusculoskeletal model,2022

    • Author(s)
      Naoto Izumi, Tomoki Hirose, Takashi Yoshida, Kei Masani, Takeshi Yamaguchi
    • Organizer
      ISPGR World Congress 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Effect of end face corner face shaperadius of rubber block on friction under lubrication condition2022

    • Author(s)
      Arata Ishizako, Masaki Tomosada, Takeshi Yamaguchi
    • Organizer
      International conference on slips, trips, and falls (STF) 2022 in Sendai
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 端面角部半径が異なるゴムブロックの無 潤滑下及び潤滑下における摩擦特性2022

    • Author(s)
      石﨏新太, 友定雅貴,堀切川一男,山口健
    • Organizer
      日本トライボロジー会議2022春東京
    • Related Report
      2022 Annual Research Report
  • [Presentation] ゴムブロックの摩耗に伴う端面角部半径の変化が潤滑下の摩擦に及ぼす影響2022

    • Author(s)
      石﨏新太,松本英,山口健
    • Organizer
      日本トライボロジー会議2022秋福井
    • Related Report
      2022 Annual Research Report
  • [Presentation] 歩行中の転倒に及ぼす足底と床面間の摩擦の影響2021

    • Author(s)
      廣瀬智樹,泉直斗,吉田宇志,政二慶,山口健
    • Organizer
      シンポジウム:スポーツ工学・ヒューマンダイナミクス2021(SHD2021)
    • Related Report
      2021 Annual Research Report
  • [Presentation] 靴底センサシステムによる歩行中の靴底-床面間の摩擦係数測定2021

    • Author(s)
      山口健,高橋優哉,佐々木祥弘
    • Organizer
      日本機械学会 シンポジウム:スポーツ工学・ヒューマンダイナミクス2021(SHD2021)
    • Related Report
      2021 Annual Research Report
  • [Presentation] ゴムブロックの端面角部の形状が潤滑下の摩擦に及ぼす影響に関する研究2021

    • Author(s)
      石﨏新太,山口健,堀切川一男
    • Organizer
      日本トライボロジー会議2021秋松江
    • Related Report
      2021 Annual Research Report
  • [Presentation] Effect of foot-floor friction on trip-induced falls during shuffling gait: a simulation study2021

    • Author(s)
      Takeshi Yamaguchi, Kenichi Nakatani, Tomoki Hirose,Takashi Yoshida, Kei Masani
    • Organizer
      International Ergonomics Association 21st Triennial Congress (IEA 2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] The Future of Footwear Friction2021

    • Author(s)
      Takeshi Yamaguchi, Kurt Beschorner, Yue Sophia Li, William Ells, Richard Bowman
    • Organizer
      International Ergonomics Association 21st Triennial Congress (IEA 2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] ヒューマンロコモーションとトライボロジー2021

    • Author(s)
      山口健
    • Organizer
      2021年度第5回ヒューマンロコモーション拡張技術協議会
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] ヒューマンダイナミクスにおけるトライボロジー2020

    • Author(s)
      山口健
    • Organizer
      トライボロジー会議2020秋別府
    • Related Report
      2020 Annual Research Report
    • Invited

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Published: 2020-04-28   Modified: 2024-01-30  

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