The relationship between ground reaction force in sit-to-stand and incident falls, mobility limitations in community-dwelling older adults: a one-year longitudinal study

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  • TSUJI Taishi
    Graduate School of Comprehensive Human Sciences, University of Tsukuba
  • TSUNODA Kenji
    Graduate School of Comprehensive Human Sciences, University of Tsukuba
  • OKURA Tomohiro
    Faculty of Health and Sport Sciences, University of Tsukuba

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Other Title
  • 縦断調査における地域在住高齢者の椅子立ち上がり動作時の地面反力と転倒発生，起居移動動作能力低下との関連
  • 第10回記念大会優秀発表 縦断調査における地域在住高齢者の椅子立ち上がり動作時の地面反力と転倒発生,起居移動動作能力低下との関連
  • ダイ10カイ キネン タイカイ ユウシュウ ハッピョウ ジュウダン チョウサ ニ オケル チイキ ザイジュウ コウレイシャ ノ イス タチアガリ ドウサジ ノ ジメン ハンリョク ト テントウ ハッセイ,タチイ イドウ ドウサ ノウリョク テイカ ト ノ カンレン

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Abstract

The purpose of this study was to examine the relationship between ground reaction force parameters in sit-to-stand at the baseline or the amounts of change (Δ) over one-year follow-up period and incidence of “one or more falls” or “mobility limitations” during the follow-up period, in community-dwelling older adults. We performed analyses on 76 community-dwelling older adults, which included 29 men and 47 women, aged 65-84 years (73.5 ± 5.6 years) at baseline. Five parameters were measured: peak reaction force per body weight (F/w), which reflected the maximal downward push to rise the body upwards, two maximal rate of force development per body weight (RFD1/w, RFD9/w), which were an index of the capacity for rapid muscle force production, and two time-related parameters (T1, T2), which evaluated quickness of movement. Significant differences were found in ΔF/w (0.00 vs. 0.04 kgf • kg-1), ΔRFD1/ w (- 1.02 vs. 0.34 kgf/s • kg-1) and ΔRFD9/w (- 0.47 vs. 0.17 kgf/s • kg-1) between fallers and non-fallers, but no difference was found in any parameters at baseline. The subjects who reported incident mobility limitations performed lower in RFD9/w (8.26 vs. 10.42 kgf/s • kg-1), longer in T1 (453 vs. 301 ms) and T2 (1081 vs. 811 ms) at the baseline than the subjects who maintained good mobility. These results suggest that RFD9/w declines with incidence of falls, and may be able to predict onset of mobility limitations.

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