Jang Jaeho, Migel Kimmery G, Kim Hoon, Wikstrom Erik A
MOTION Science Institute, Department of Exercise & Sport Science, University of North Carolina at Chapel Hill, NC, USA.
MOTION Science Institute, Department of Exercise & Sport Science, University of North Carolina at Chapel Hill, NC, USA.
Gait Posture. 2021 Oct;90:261-266. doi: 10.1016/j.gaitpost.2021.09.171. Epub 2021 Sep 14.
Individuals with chronic ankle instability (CAI) exhibit altered vertical ground reaction forces (vGRF), a laterally shifted center of pressure, and an inverted foot position during walking. These neuromechanical alterations are linked with altered ankle joint loading in this population. Vibration-based gait retraining improves center of pressure positioning but effects on neuromechanical variables influencing joint loading remains unknown.
Do patients with CAI exhibit altered vGRF and ankle joint contact forces (JCF) after receiving a single session of vibration-based gait retraining?
Ten individuals with CAI underwent a single session of vibration-based gait retraining. Kinematic and kinetic data were collected during walking on an instrumental treadmill with force plates embedded in it. Following a baseline gait assessment without feedback, participants walked at a self-selected speed for 10 minutes while receiving feedback. Data was collected during an early (1 st and 2 nd minute) and late adaptation phase (9 th and 10 th minute) and, compared to baseline values. Impact and propulsive vGRF variables (i.e. peak, time to peak, and loading rate) were obtained. Musculoskeletal modeling was used to calculate ankle JCF variables (peak, impulse, and loading rate) during stance phase.
Propulsive vGRF and ankle JCF outcomes were significantly reduced during the early and late adaptation phases (p ≤ 0.039).
These results indicate that vibration-based gait retraining can immediately reduce propulsive vGRF and ankle JCF and may represent a modality that could help restore appropriate ankle joint loading patterns in those with CAI.
慢性踝关节不稳（CAI）患者在行走时表现出垂直地面反作用力（vGRF）改变、压力中心侧向偏移以及足部位置内翻。这些神经力学改变与该人群踝关节负荷改变有关。基于振动的步态再训练可改善压力中心定位，但对影响关节负荷的神经力学变量的影响尚不清楚。
CAI患者在接受单次基于振动的步态再训练后，vGRF和踝关节接触力（JCF）是否会发生改变？
10名CAI患者接受了单次基于振动的步态再训练。在一台嵌入测力板的仪器化跑步机上行走时收集运动学和动力学数据。在无反馈的基线步态评估后，参与者在接受反馈的同时以自选速度行走10分钟。在早期（第1和第2分钟）和晚期适应阶段（第9和第10分钟）收集数据，并与基线值进行比较。获得冲击和推进vGRF变量（即峰值、峰值时间和负荷率）。使用肌肉骨骼模型计算站立期的踝关节JCF变量（峰值、冲量和负荷率）。
在早期和晚期适应阶段，推进vGRF和踝关节JCF结果均显著降低（p≤0.039）。
这些结果表明，基于振动的步态再训练可立即降低推进vGRF和踝关节JCF，可能是一种有助于恢复CAI患者适当踝关节负荷模式的方法。
