Stroke affects the coordination and stabilization of head, thorax and pelvis during voluntary horizontal head motions performed in walking
Stroke affects the coordination and stabilization of head, thorax and pelvis during voluntary horizontal head motions performed in walking
复制标题
DOI：
10.1016/j.clinph.2004.07.027
复制
发表时间：
2005-01-01
影响因子：
4.7
通讯作者：
Paquet, N
中科院分区：
文献类型：
--
作者：
Lamontagne, A;De Serres, SJ;Paquet, N
目的：本研究旨在调查和比较健康 (n = 5) 和偏瘫 (it = 10) 受试者在行走时有或没有水平自愿转动头部时轴向节段的协调性和稳定性。方法：指示受试者按照右脚（健康）或偏瘫（偏瘫）脚初次接触时触发的发光箭头信号（战斗、向左或无）指示的方向尽快转动头部。使用逆反射标记和带有 6 个高分辨率摄像机的 Vicon-512 系统从 9 段模型获得头部、胸部和骨盆运动。使用循环图和互相关分析来表征水平面中轴向节段的协调。使用节段归一化加速度曲线的均方根 (RMS) 值来量化节段的稳定性。结果：健康受试者表现出轴向节段协调的方向依赖性调节，头部转向和远离支撑肢分别有利于和阻碍运动过程中胸部相对于骨盆的反向旋转模式。与此同时，骨盆运动保持不变。这种方向特异性的调制模式在偏瘫受试者中在空间和时间域上都被破坏。此外，在偏瘫组中观察到较大的头部和胸部节段的均方根值，无论是否有自愿头部运动的叠加。结论：研究结果表明：（1）步行期间的头部旋转以特定方向的方式改变轴向节段协调，（2）与运动相关的骨盆旋转不受头部旋转的影响，（3）中风改变了这种协调行为，这可能导致运动期间的平衡功能障碍。 (C) 2004 年国际临床神经生理学联合会。由爱思唯尔爱尔兰有限公司出版。保留所有权利。
Objective: This study was conducted to investigate and compare the coordination and stabilization of axial segments during walking with and without horizontal voluntary head turns, in healthy (n = 5) and hemiparetic (it = 10) subjects.Methods: Subjects were instructed to turn the head as fast and as soon as possible in the direction indicated by an illuminated arrow signal (fight, left or none) that was triggered at initial contact of the right (healthy) or paretic (hemiparetic) foot. Head, thorax, and pelvis motions were obtained from a 9-segment model using retro-reflective markers and a Vicon-512 system with 6 high-resolution cameras. Coordination of axial segments in the horizontal plane was characterized using cyclographs and cross-correlation analyses. Stabilization of the segments was quantified using root mean square (RMS) values of the segment's normalized acceleration profile.Results: The healthy subjects showed a direction-dependent modulation of axial segment coordination, with head turns toward and away from the stance limb favoring and hindering, respectively, the contra-rotational pattern of the thorax with respect to the pelvis during locomotion. Meanwhile, pelvis motions remained unaltered. This direction-specific modulation pattern was disrupted in the hemiparetic subjects, both in the spatial and temporal domains. Moreover, larger RMS values for head and thorax segments were observed in the hemiparetic groups, both with and without the superimposition of voluntary head motions.Conclusions: The findings suggest that: (1) head rotations during walking modify axial segment coordination in a direction-specific manner, (2) the pelvic rotations associated with locomotion remained unaffected by head rotations and (3) stroke alters this coordination behavior, which may contribute to balance dysfunctions during locomotion. (C) 2004 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved.