The relationship between ground reaction force in sit-to-stand movement and lower extremity function in community-dwelling Japanese older adults using long-term care insurance services

  • Shen Shaoshuai
    Doctoral Program in Physical Education, Health and Sport Sciences, University of Tsukuba: 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8574, Japan
  • Abe Takumi
    Doctoral Program in Physical Education, Health and Sport Sciences, University of Tsukuba: 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8574, Japan Japan Society for the Promotion of Science, Japan
  • Tsuji Taishi
    Center for Preventive Medical Sciences, Chiba University, Japan
  • Fujii Keisuke
    Doctoral Program in Physical Education, Health and Sport Sciences, University of Tsukuba: 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8574, Japan Department of Occupational Therapy, Ibaraki Prefectural University of Health Science, Japan
  • Ma Jingyu
    Master’s Program in Health and Sport Sciences, University of Tsukuba, Japan
  • Okura Tomohiro
    Faculty of Health and Sport Sciences, University of Tsukuba, Japan

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<p> [Purpose] The purpose of this study was to investigate which of the four chair-rising methods has low-load and the highest success rate, and whether the GRF parameters in that method are useful for measuring lower extremity function among physically frail Japanese older adults. [Subjects and Methods] Fifty-two individuals participated in this study. The participants voluntarily attempted four types of Sit-to-stand test (one variation without and three variations with the use of their arms). The following parameters were measured: peak reaction force (F/w), two force development rate parameters (RFD1.25/w, RFD8.75/w) and two time-related parameters (T1, T2). Three additional commonly employed clinical tests (One-leg balance with eyes open, Timed up and go and 5-meter walk test) were also conducted. [Results] “Hands on a chair” chair-rising method produced the highest success rate among the four methods. All parameters were highly reliable between testing occasions. T2 showed strongly significant associations with Timed up and go and 5-meter walk test in males. RFD8.75/w showed significant associations with Timed up and go and 5-meter walk test in females. [Conclusion] Ground reaction force parameters in the Sit-to-stand test are a reliable and useful method for assessment of lower extremity function in physically frail Japanese older adults.</p>

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