Relationship between postural sway on an unstable platform and ankle plantar flexor force steadiness in community-dwelling older women |
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| Institution: | 1. Human Health Sciences, Graduate School of Medicine, Kyoto University, 53 Shogoin-Kawahara-cho, Sakyo-ku, Kyoto, 606-8507, Japan;2. Research Fellow of the Japan Society for the Promotion of Science, 5-3-1 Kojimachi, Chiyoda-ku, Tokyo, 102-0083, Japan;3. Graduate School of Human Development and Environment, Kobe University, 3-11 Tsurukabuto, Nada-ku, Kobe, Hyogo, 657-0011, Japan;4. Research Institute, Kyoto University of Advanced Science, 18 Gotanda-cho, Yamanouchi, Ukyo-ku, Kyoto, 615-8577, Japan;5. Faculty of Nursing, Doshisha Women’s College of Liberal Arts, Koudo, 97-1, Minamihokotate, Kodo, Kyotanabe City, Kyoto, 610-0395, Japan;1. Department of Preventive Physical Therapy, Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan;2. Mixi Incorporated, Tokyo, Japan;3. Department of Physical Therapy, Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan;1. Department of Sport Science, University of Innsbruck, Fürstenweg 185 A-6020 Innsbruck, Austria;2. Department of Physical Therapy, University of Phayao, 19 Moo 2 Maeka, Muang, Phayao 56000, Thailand |
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| Abstract: | BackgroundForce 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.Research questionThis study aimed to investigate whether ankle plantar flexor force steadiness was related to postural sway on stable and unstable platforms in older adults.MethodsTwenty-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.ResultsThe 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).SignificanceThese results indicate that the ability to control muscle force could be important for postural stability on an unstable platform in older adults. |
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| Keywords: | Force control Force steadiness Ankle plantar flexor Older adults Postural control |
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