Standing on a sliding board affects generation of anticipatory and compensatory postural adjustments.
Standing on a sliding board affects generation of anticipatory and compensatory postural adjustments.
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DOI：
10.1016/j.jelekin.2017.12.008
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发表时间：
2018-03
期刊：
影响因子：
--
通讯作者：
Aruin AS
中科院分区：
文献类型：
--
作者：
Chen B;Lee YJ;Aruin AS
在身体不稳定的情况下，姿势控制会受到影响。我们研究了人们在站在不稳定的表面上并进行自愿手臂运动时用来保持平衡的预期和补偿性姿势调整。九名健康的参与者站在一块滑板上（滑板要么被锁定，因此一动不动，要么解锁，因此可以在前后方向上自由移动），并进行快速的双侧手臂屈曲。在预期 (APA) 和补偿性 (CPA) 姿势调整的典型间隔内记录和分析手臂加速度、躯干和下肢肌肉的双侧肌电活动 (EMG) 以及压力中心 (COP) 位移。锁定和解锁条件下手臂运动的加速度峰值没有不同。当站在未锁定的滑板上时，APA 和 CPA 的下肢肌肉中观察到较大的肌电图积分。躯干肌肉没有观察到显着差异。当参与者站在锁定板上时，可以看到更大的最大 COP 位移。结果表明，当站在自由移动的滑板上并进行双侧手臂屈曲时，中枢神经系统（CNS）不会减慢手臂运动；相反，它会改变下肢肌肉的激活。观察到的锁定和解锁条件下 APA 和 CPA 的差异表明，CNS 在控制任务的焦点部分时采用了类似的策略，并调整靠近不稳定源的肌肉活动来控制姿势任务。
Postural control is compromised in the presence of body instability. We studied anticipatory and compensatory postural adjustments people use to maintain balance while standing on an unstable surface and performing voluntary arm movements. Nine healthy participants stood on a sliding board (that was either locked and as such motionless or unlocked and as such free to move in the anterior-posterior direction) and performed fast bilateral arms flexion. Arm acceleration, bilateral electromyographic activity (EMG) of the trunk and lower extremity muscles and center of pressure (COP) displacements were recorded and analyzed within the intervals typical for the anticipatory (APAs) and compensatory (CPAs) postural adjustments. Peaks of acceleration of the arm movements were not different between the locked and unlocked conditions. Larger EMG integrals were seen in the muscles of the lower extremity in both APAs and CPAs when standing on the unlocked sliding board. No significant difference was observed in the trunk muscles. Larger maximum COP displacement was seen when participants stood on the locked board. The results demonstrated that when standing on a free to move sliding board and performing bilateral arm flexion, the central nervous system (CNS) does not slow down the arm movements; instead it modifies activation of the lower extremity muscles. The observed differences in APAs and CPAs between the locked and unlocked conditions suggest that the CNS employs similar strategy while controlling the focal part of the task and adjusts the activity of muscles that are close to the source of instability to control postural task.
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