Division of Sport Rehabilitation, Graduate School of Biomedical and Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan.
Department of Biomedical Engineering, Faculty of Engineering, The Hong Kong Polytechnic University, 11 Yuk Choi Road, Hung Hom, Hong Kong, China.
Int J Environ Res Public Health. 2021 Apr 23;18(9):4511. doi: 10.3390/ijerph18094511.
The plantar fascia and intrinsic foot muscles (IFM) modulate foot stiffness. However, it is unclear whether the corresponding ultrasonography findings reflect it. This study aimed to examine the effect of the plantar fascia and IFM morphologies on force attenuation during landing and reactivity when jumping in healthy adults ( = 21; age, 21-27 years). Thickness, cross-sectional area (CSA), and hardness of the plantar fascia, abductor hallucis (AbH), and flexor hallucis brevis (FHB) muscles were measured using ultrasonography. Single-leg drop landing and repetitive rebound jumping tests assessed the ground reaction force (GRF) and reactive jump index (RJI), respectively. The CSA of FHB was negatively correlated with maximum vertical GRF (r = -0.472, = 0.031) in the single-leg drop landing test. The CSA of AbH was negatively correlated with contact time (r = -0.478, = 0.028), and the plantar fascia thickness was positively correlated with jump height (r = 0.615, = 0.003) and RJI (r = 0.645, = 0.002) in the repetitive bound jump test. In multivariate regression analysis, only the plantar fascia thickness was associated with RJI (β = 0.152, 95% confidence interval: 7.219-38.743, = 0.007). The CSA of FHB may contribute to force attenuation during landing. The thickness of the plantar fascia and CSA of AbH may facilitate jumping high with minimal contact time.
足底筋膜和内在足部肌肉（IFM）调节足部刚度。然而，目前尚不清楚相应的超声检查结果是否反映了这一点。本研究旨在检查健康成年人的足底筋膜和 IFM 形态对落地时力衰减和跳跃时反应性的影响（n=21；年龄，21-27 岁）。使用超声测量足底筋膜、外展拇肌（AbH）和趾短屈肌（FHB）的厚度、横截面积（CSA）和硬度。单腿下落着地和重复反弹跳跃测试分别评估地面反作用力（GRF）和反应性跳跃指数（RJI）。FHB 的 CSA 与单腿下落着地测试中的最大垂直 GRF 呈负相关（r=-0.472，p=0.031）。AbH 的 CSA 与接触时间呈负相关（r=-0.478，p=0.028），而足底筋膜厚度与跳跃高度（r=0.615，p=0.003）和重复跳跃测试中的 RJI（r=0.645，p=0.002）呈正相关。多元回归分析显示，只有足底筋膜厚度与 RJI 相关（β=0.152，95%置信区间：7.219-38.743，p=0.007）。FHB 的 CSA 可能有助于着陆时的力衰减。足底筋膜的厚度和 AbH 的 CSA 可能有助于以最小的接触时间实现高跳跃。
