Underlying mechanisms of interlimb weight transfer for effective protective stepping against falls

• Project/Area Number: 18H03162
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 59020:Sports sciences-related
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: Fujimoto Masahiro 国立研究開発法人産業技術総合研究所, 情報・人間工学領域, 主任研究員 (10732919)
• Co-Investigator(Kenkyū-buntansha): 伊坂 忠夫 立命館大学, スポーツ健康科学部, 教授 (30247811) ; 長野 明紀 立命館大学, スポーツ健康科学部, 教授 (30392054) ; 真田 樹義 立命館大学, スポーツ健康科学部, 教授 (50421227)
• Project Period (FY): 2018-04-01 – 2022-03-31
• Project Status: Completed (Fiscal Year 2021)
• Budget Amount: ¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000); Fiscal Year 2021: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000); Fiscal Year 2020: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000); Fiscal Year 2019: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000); Fiscal Year 2018: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
• Keywords: バイオメカニクス / 姿勢制御 / 体重移動 / 動作分析 / ステップ動作 / 応答動作 / 高齢者 / 転倒

Outline of Final Research Achievements

Rapid sidestepping is a crucial protective action against falls where timing delays are risk factors for falls among older adults. Age-associated delays in lateral step timing may involve deficits in reactive response and/or limited AB-AD muscle capacity. This study investigated the underlying mechanisms of interlimb weight transfer for rapid sidestepping in older adults in relation to fall history and hip AB-AD muscle strength. Older adults with greater fall risk or lower hip adductor strength demonstrated a longer step lift-off time when initiated during the step-limb loading phase. Slower step lift-off was attributable to a longer reaction time for older fallers and a longer weight transfer time for those with lower hip adductor strength. Targeting enhancement of reaction time and hip adductor strength may promote faster protective stepping and reduce fall risk.

Academic Significance and Societal Importance of the Research Achievements

転倒を回避するために重要となる，ステップ前の効果的な体重移動を阻害する要因を明らかにした．高齢者では歩行動作や方向転換動作のように，適切な体重移動が要求される動作において，特に転倒の頻度が高い．なかでも，身体左右方向の転倒は，寝たきりや要介護状態を招く主要因である大腿部頸部骨折に繋がる．本研究で得られた研究成果は，高齢者の身体左右方向の姿勢制御能力を向上し，効果的に左右方向の転倒リスクを低減するトレーニングの確立に繋がる．

Research Products

• [Int'l Joint Research] University of Maryland(米国)
• [Int'l Joint Research] University of Maryland(米国)
• [Int'l Joint Research] University of Maryland, Baltimore(米国)
• [Int'l Joint Research] University of Oregon/University of Maryland, Baltimore(米国)
• [Journal Article] Preparatory Knee Flexion-Extension Movements Enhance Rapid Sidestepping Performance in Collegiate Basketball Players (2021)
  • Author(s): Fujimoto Masahiro、Uchida Eri、Nagano Akinori、Rogers Mark W.、Isaka Tadao
  • Journal Title: Frontiers in Sports and Active Living Volume: 3 Pages: 1-11
  • DOI: 10.3389/fspor.2021.670649
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Lateral Perturbation-Induced and Voluntary Stepping in Fallers and Nonfallers After Stroke (2020)
  • Author(s): Gray Vicki L、Fujimoto Masahiro、Rogers Mark W
  • Journal Title: Physical Therapy Volume: 100 Issue: 9 Pages: 1557-1567
  • DOI: 10.1093/ptj/pzaa109
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Adverse effects of the coexistence of locomotive syndrome and sarcopenia on the walking ability and performance of activities of daily living in Japanese elderly females: a cross-sectional study (2020)
  • Author(s): Nishimura Tomohiro、Imai Aiko、Fujimoto Masahiro、Kurihara Toshiyuki、Kagawa Kentaro、Nagata Taketoyo、Sanada Kiyoshi
  • Journal Title: Journal of Physical Therapy Science Volume: 32 Issue: 3 Pages: 227-232
  • DOI: 10.1589/jpts.32.227
  • NAID: 130007807457
  • ISSN: 0915-5287, 2187-5626
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Associations among Bone Mineral Density, Physical Activity and Nutritional Intake in Middle-Aged Women with High Levels of Arterial Stiffness: A Pilot Study (2020)
  • Author(s): Hamaguchi Kanako、Kurihara Toshiyuki、Fujimoto Masahiro、Sato Koji、Iemitsu Motoyuki、Hamaoka Takafumi、Sanada Kiyoshi
  • Journal Title: International Journal of Environmental Research and Public Health Volume: 17 Issue: 5 Pages: 1620-1620
  • DOI: 10.3390/ijerph17051620
  • NAID: 120006873068
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Stepping characteristics during externally induced lateral reactive and voluntary steps in chronic stroke. (2019)
  • Author(s): Gray VL, Yang C-L, Fujimoto M, McCombe Waller S, and Rogers MW
  • Journal Title: Gait & Posture. Volume: 71 Pages: 198-204
  • DOI: 10.1016/j.gaitpost.2019.05.001
  • Peer Reviewed / Int'l Joint Research
• [Presentation] Age-associated effect of pre-step interlimb weight shifting on rapid sidestepping is related to fall history and hip strength (2022)
  • Author(s): Masahiro Fujimoto, Shoma Kudo, and Mark W Rogers
  • Organizer: ISPGR World Congress 2022
  • Int'l Joint Research
• [Presentation] 立位時の外乱に対するステップ動作の加齢変化 (2021)
  • Author(s): 藤本雅大
  • Organizer: 計測自動制御学会ライフエンジニアリング部門シンポジウム2021（SICE LE2021）
  • Invited
• [Presentation] 左右方向のアシストを行う歩行支援ロボットの提案と単一IMUに基づく歩行イベントの検出と予測 (2021)
  • Author(s): 朱天意, 尾形邦裕, 藤本雅大, 松本吉央
  • Organizer: 第39回日本ロボット学会学術講演会
• [Presentation] 転倒経験の有無が歩行中の前額面上の下肢関節モーメントに与える影響 (2021)
  • Author(s): 稲井卓真, 藤本雅大, 高林和也, 小林吉之
  • Organizer: 第42回バイオメカニズム学術講演会
• [Presentation] Effect of preparatory knee flexion-extension movements on subsequent sideways jump-to-reach performance in collegiate soccer goalkeepers (2020)
  • Author(s): Fujimoto M, Sato M, Nagano A, and Isaka T
  • Organizer: 第2回 彗ひろば（バイオメカニクス研究会）
• [Presentation] 外乱に対する姿勢制御の加齢変化メカニズム (2020)
  • Author(s): 藤本雅大
  • Organizer: 姿勢歩行シンポジウム2020
  • Invited
• [Presentation] Lateral perturbation-induced and voluntary stepping in fallers and non-fallers after stroke (2020)
  • Author(s): Gray VL, Fujimoto M, Rogers MW
  • Organizer: American Physical Therapy Association Combined Sections Meeting 2020
  • Int'l Joint Research
• [Presentation] Effect of preparatory knee flexion-extension movements on subsequent sideways jump-to-reach performance (2018)
  • Author(s): Fujimoto M, Sato M, Nagano A, and Isaka T
  • Organizer: The 8th World Congress of Biomechanics
  • Int'l Joint Research
• [Presentation] 膝関節の屈曲伸展による予備動作がサイドジャンプによる到達把持動作に及ぼす影響 (2018)
  • Author(s): 藤本雅大，佐藤将臣，長野明紀，伊坂忠夫
  • Organizer: 第25回日本バイオメカニクス学会大会
• [Presentation] Forward and false step techniques used for sprint start in a sideways direction: Which is superior? (2018)
  • Author(s): Sato T, Fukuhara Y, Fujimoto M, and Isaka T
  • Organizer: The 36th International Conference on Biomechanics in Sports 2018