Reorientation to vertical modulated by combined support surface tilt and virtual visual flow in healthy elders and adults with stroke.
Reorientation to vertical modulated by combined support surface tilt and virtual visual flow in healthy elders and adults with stroke.
复制标题
通过组合支撑表面倾斜和虚拟视觉流对健康老年人和患有中风的成年人进行垂直调节的重新定向。
DOI：
10.1007/s00415-012-6566-7
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发表时间：
2012
影响因子：
6
通讯作者：
Keshner,EmilyA
中科院分区：
文献类型：
--
作者：
Slaboda,JillC;Keshner,EmilyA
我们探讨了视觉注意力的变化如何影响虚拟现实环境中健康老年人和中风后成年人的姿势运动表现，包括前庭信息不可感知的情况。采用杆框任务评估了13名健康人（50-80岁）和13名中风后成人（49-70岁）的视觉依赖性。以30°/s的速度进行三度支撑表面背屈倾斜，并结合视觉环境的30°和45°/s连续俯仰旋转。支撑表面保持倾斜30 s，然后在继续视野旋转期间以0.1°/s返回到中性。记录身体位移和踝关节肌肉反应，并计算小波变换。肌肉频率和运动学指标采用功能性主成分分析，体重通过混合模型重复测量方差分析进行比较。这两个群体都表现出增加后摇与俯仰向上的视野运动;成年人中风后产生显着更大的肌肉反应。当视觉流速度与平台速度匹配时，横向摇摆最受调节。视觉流与方向的支持面不稳定性和视觉依赖的个人产生更多的控制横向摇摆时，观看动态视野。在动态视觉流场中引发姿势不稳定可以作为姿势稳定动作的训练工具，特别是当表现出视觉依赖时。
We explored how changes in visual attention impacted postural motor performance in healthy elders and adults post-stroke within a virtual reality environment, including when vestibular information was not perceptible. Visual dependence in 13 healthy (50–80 years) and 13 adults post-stroke (49–70 years) was assessed with a rod-and-frame task. Three degree support surface dorsiflexion tilts at 30°/s were combined with 30° and 45°/s continuous pitch rotations of the visual environment. The support surface remained tilted for 30 s followed by a 0.1°/s return to neutral during continued visual field rotation. Body displacement and ankle muscle responses were recorded, and wavelet transforms calculated. Muscle frequencies and kinematic measures were examined with functional principal component analysis, and weights compared through mixed model repeated measures ANOVA. Both populations exhibited increased backward sway with pitch upward visual field motion; adults post-stroke produced significantly larger muscle responses. Lateral sway was most regulated when visual flow velocity matched platform velocity. Visual flow summed with direction of support surface instability and visually dependent individuals produced more controlled lateral sway when viewing a dynamic visual field. Provoking postural instability within a dynamic visual flow field could serve as a training tool for postural stabilizing actions, particularly when visual dependence is exhibited.