Age-related differences in head and trunk coordination during walking
Age-related differences in head and trunk coordination during walking
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DOI：
10.1016/j.humov.2005.07.003
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发表时间：
2005-08-01
影响因子：
2.1
通讯作者：
Morrison, S
中科院分区：
文献类型：
--
作者：
Kavanagh, JJ;Barrett, RS;Morrison, S
本研究的目的是检查衰老对步行过程中头部和躯干加速度模式和结构的影响。使用三轴加速度计测量年轻人（n = 8；平均值 = 23 岁，SD = 4 岁）和老年人（n = 8；平均值 = 74 岁，SD = 3 岁）的头部和躯干加速度，同时进行首选速度行走。使用功率谱分析和信号平滑度、规律性和耦合测量来检查加速度。各年龄组之间没有检测到步行速度或信号规律性差异。与年轻参与者相比，老年人（1）躯干的6Hz以上信号功率比例更大，（2）躯干和头部之间的信号平滑度差异较小，（3）中外侧方向的信号平滑度较小，（4）与躯干相比，头部的方向耦合程度更大。总体而言，这些结果表明，头部加速度的模式相对不受年龄的影响，尽管躯干加速度特征存在差异，但两个年龄组的头部稳定性水平相似。不同年龄组实现头部稳定性的方式有所不同，老年人采用上半身协调策略，与躯干相比，增强了头部加速方向之间的耦合。这项研究的结果还表明，姿势系统一个级别的信号复杂性不存在与年龄相关的差异，再加上另一个级别的差异，可能会提供有关运动系统在步态过程中优先考虑姿势控制的方式的信息。 (c) 2005 Elsevier B.V. 保留所有权利。
The purpose of this study was to examine the effect of ageing on the pattern and structure of head and trunk accelerations during walking. Head and trunk accelerations of young (n = 8; mean = 23 years, SD = 4 years) and elderly (n = 8; mean = 74 years, SD = 3 years) individuals were measured using triaxial accelerometers while performing preferred speed walking. Accelerations were examined using power-spectral analysis and measures of signal smoothness, regularity and coupling. No differences in walking speed or signal regularity were detected between age groups. Compared to the young participants, the elderly had (1) a greater proportion of signal power above 6 Hz for the trunk, (2) a smaller difference in signal smoothness between the trunk and head, (3) less signal smoothness in the mediolateral direction, and (4) a greater degree of directional coupling for the head compared to the trunk. Overall these results suggest that the pattern of head accelerations was relatively unaffected by age, and that both age groups achieved similar levels of head stability despite differences in trunk acceleration characteristics. The manner in which head stability was achieved differed between age groups, with the elderly employing an upper body coordination strategy that enhanced coupling between acceleration directions of the head compared to the trunk. The findings of this study also suggest that an absence of age-related differences in signal complexity at one level of postural system, combined with differences at another level, may provide information about the way in which the motor system prioritises postural control during gait. (c) 2005 Elsevier B.V. All rights reserved.