Human Health Sciences, Graduate School of Medicine, Kyoto University, 53 Shogoin-Kawahara-cho, Sakyo-ku, Kyoto, 606-8507, Japan; Research Fellow of the Japan Society for the Promotion of Science, 5-3-1 Kojimachi, Chiyoda-ku, Tokyo, 102-0083, Japan.
Human Health Sciences, Graduate School of Medicine, Kyoto University, 53 Shogoin-Kawahara-cho, Sakyo-ku, Kyoto, 606-8507, Japan.
Gait Posture. 2021 Feb;84:227-231. doi: 10.1016/j.gaitpost.2020.12.023. Epub 2020 Dec 25.
Force steadiness is evaluated as force variability during constant force exertion around a target level. Ankle plantar flexor force steadiness is reported to be related to postural sway on an unstable platform in healthy young adults; however, this relationship in older adults is unclear.
This study aimed to investigate whether ankle plantar flexor force steadiness was related to postural sway on stable and unstable platforms in older adults.
Twenty-six community-dwelling older women participated in this study (72 ± 6 years). Maximal isometric strength and force steadiness at 5%, 20 %, and 50 % of the maximal strength of ankle plantar flexion were assessed. Postural sway in the anteroposterior direction during bipedal standing was measured on stable and unstable platforms.
The results showed that force steadiness at any intensity level and maximal isometric strength were not related to postural sway on the stable platform. Force steadiness at 20 % of maximal strength alone was significantly correlated with postural sway on the unstable platform (ρ = 0.441, p < 0.05).
These results indicate that the ability to control muscle force could be important for postural stability on an unstable platform in older adults.
力量稳定性是通过在目标水平周围进行恒力施力来评估的力可变性。有报道称，健康的年轻成年人的踝关节跖屈肌力量稳定性与在不稳定平台上的姿势摆动有关；然而，老年人的这种关系尚不清楚。
本研究旨在探讨踝关节跖屈肌力量稳定性是否与老年人在稳定和不稳定平台上的姿势摆动有关。
26 名社区居住的老年女性参加了这项研究（72 ± 6 岁）。评估了最大等长强度和 5%、20%和 50%最大强度的踝关节跖屈肌力量稳定性。双足站立时，在稳定和不稳定平台上测量了前后方向的姿势摆动。
结果表明，任何强度水平的力量稳定性和最大等长强度都与稳定平台上的姿势摆动无关。仅最大力量的 20%的力量稳定性与不稳定平台上的姿势摆动显著相关（ρ=0.441，p<0.05）。
这些结果表明，控制肌肉力量的能力可能对老年人在不稳定平台上的姿势稳定性很重要。
