Effect of walking speed on inter-joint coordination differs between young and elderly adults
Effect of walking speed on inter-joint coordination differs between young and elderly adults
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DOI：
10.1016/j.jbiomech.2011.10.028
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发表时间：
2012-01-10
影响因子：
2.4
通讯作者：
Chou, Li-Shan
中科院分区：
文献类型：
--
作者：
Chiu, Shiu-Ling;Chou, Li-Shan
研究年轻人和老年人在不同步行速度下的关节间协调性可以为步态神经肌肉控制的年龄相关变化提供见解。我们研究了步行速度和年龄对关节间协调的模式和变异性的影响。对10名年轻人和10名老年人进行了步态分析，其中包括不同的自选速度，包括首选速度，更快的速度和更慢的速度。连续相对相位（CRP），来自两个相邻关节的相平面，用于评估关节间的协调。当比较较快或较慢速度与首选速度步行的总体平均曲线时，用交叉相关测量和均方根（RMS）差异检查CRP模式。每个参与者的协调性的变异性进行了评估，所有标准偏差的平均值计算每个数据点在一个步态周期从所有CRP曲线，即偏差阶段（DP）。对于髋-膝CRP模式，RMS差异显着更大的较慢和首选的步行速度之间比更快和首选的步行速度在年轻人，但这并没有发现在老年人。在较慢和首选步行速度之间的髋-膝CRP模式中检测到RMS差异和交叉相关测量的显著组差异。没有显着的步行速度或年龄的影响，检测膝踝CRP。在髋-膝DP值中也检测到显著的步行速度效应。然而，所有三种速度均未检测到显著的组间差异。这些结果表明，青年和老年人妥协的步行速度的变化与不同的神经肌肉控制策略。(C)2011爱思唯尔有限公司保留所有权利。
Investigating inter-joint coordination at different walking speeds in young and elderly adults could provide insights to age-related changes in neuromuscular control of gait. We examined effects of walking speed and age on the pattern and variability of inter-joint coordination. Gait analyses of 10 young and 10 elderly adults were performed with different self-selected speeds, including a preferred, faster, and slower speed. Continuous relative phase (CRP), derived from phase planes of two adjacent joints, was used to assess the inter-joint coordination. CRP patterns were examined with cross-correlation measures and root-mean-square (RMS) differences when comparing ensemble mean curves of the faster or slower speed to preferred speed walking. Variability of coordination for each participant was assessed with the average value of all standard deviations calculated for each data point over a gait cycle from all CRP curves, namely the deviation phase (DP). For hip-knee CRP pattern, RMS differences were significantly greater between the slower and preferred walking speeds than between the faster and preferred walking speeds in young adults, but this was not found in elderly adults. Significant group differences in RMS differences and cross-correlation measures were detected in hip-knee CRP patterns between the slower and preferred walking speeds. No significant walking speed or age effects were detected for the knee-ankle CRP. Significant walking speed effects were also detected in hip-knee DP values. However, no significant group differences were detected for all three speeds. These findings suggested that young and elder adults compromise changes of walking speed with different neuromuscular control strategies. (C) 2011 Elsevier Ltd. All rights reserved.