Gait & Posture ( IF 2.4 ) Pub Date : 2021-09-14 , DOI: 10.1016/j.gaitpost.2021.09.171 Jaeho Jang 1 , Kimmery G Migel 1 , Hoon Kim 2 , Erik A Wikstrom 1
Background
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.
Research Question
Do patients with CAI exhibit altered vGRF and ankle joint contact forces (JCF) after receiving a single session of vibration-based gait retraining?
Methods
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.
Results
Propulsive vGRF and ankle JCF outcomes were significantly reduced during the early and late adaptation phases (p ≤ 0.039).
Significance
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.
中文翻译:
步态过程中的急性振动反馈可减少慢性踝关节不稳患者的机械踝关节负荷
背景
患有慢性踝关节不稳 (CAI) 的个体会表现出垂直地面反作用力 (vGRF) 的改变、压力中心的横向移动以及行走过程中的倒转脚位。这些神经力学改变与该人群中踝关节负荷的改变有关。基于振动的步态再训练改善了压力中心的定位,但对影响关节负荷的神经力学变量的影响仍然未知。
研究问题
在接受单次基于振动的步态再训练后,CAI 患者是否表现出改变的 vGRF 和踝关节接触力 (JCF)?
方法
10 名 CAI 患者接受了一次基于振动的步态再训练。在器械跑步机上行走期间收集运动学和动力学数据,其中嵌入了测力板。在没有反馈的情况下进行基线步态评估后,参与者在接收反馈的同时以自行选择的速度行走 10 分钟。在早期(第 1 分钟和第 2 分钟)和晚期适应阶段(第 9 分钟和第 10 分钟)收集数据,并与基线值进行比较。获得了冲击和推进 vGRF 变量(即峰值、达到峰值的时间和加载速率)。肌肉骨骼模型用于计算站立阶段的踝关节 JCF 变量(峰值、脉冲和负荷率)。
结果
在早期和晚期适应阶段,推进性 vGRF 和踝关节 JCF 结果显着降低(p ≤ 0.039)。
意义
这些结果表明,基于振动的步态再训练可以立即减少推进性 vGRF 和踝关节 JCF,并且可能代表一种可以帮助 CAI 患者恢复适当踝关节负荷模式的方式。