Anticipatory and compensatory postural adjustments in conditions of body asymmetry induced by holding an object
Anticipatory and compensatory postural adjustments in conditions of body asymmetry induced by holding an object
复制标题
DOI：
10.1007/s00221-015-4377-7
复制
发表时间：
2015-11-01
影响因子：
2
通讯作者：
Aruin, Alexander S.
中科院分区：
文献类型：
--
作者：
Chen, Bing;Lee, Yun-Ju;Aruin, Alexander S.
研究了身体不对称性对预期和补偿性姿势调整的影响。10名健康受试者站在测力平台上，单手握住物体，诱导身体不对称。受试者暴露于外部扰动施加到他们的肩膀，而站在正常或狭窄的基础上的支持。记录背侧和腹侧躯干和腿部肌肉的双侧肌电图活动（EMG）和压力中心位移。在预期（阿帕）和代偿性姿势调整的典型间隔内分析数据。计算并分析了肌电活动积分和肌肉的协同收缩和交互激活积分。当站立在不对称的姿势和受到外部扰动时，可以看到目标侧肌肉的相互激活和对侧肌肉的共同收缩。在阿帕阶段，当不对称站立时，肌肉的共同收缩和相互激活的幅度降低。研究结果强调了调查身体不对称性在保持垂直姿势控制中的作用的重要性。本研究结果为未来的研究提供了基础，重点是改善由于单侧无力导致身体不对称的个体的姿势控制。
The effect of body asymmetry on anticipatory and compensatory postural adjustments was studied. Ten healthy subjects stood on the force platform and held an object in one hand which induced body asymmetry. Subjects were exposed to external perturbations applied to their shoulders while standing with either normal or narrow base of support. Bilateral electromyographic activity (EMG) of dorsal and ventral trunk and leg muscles and center-of-pressure displacements were recorded. Data was analyzed within the intervals typical for anticipatory (APA) and compensatory postural adjustments. Integrals of EMG activity and co-contraction and reciprocal activation of muscles were calculated and analyzed. Reciprocal activation of muscles on the target side and co-contraction of muscles on the contralateral side were seen when standing in asymmetrical stance and being subjected to external perturbations. Decreased magnitudes of co-contraction and reciprocal activation of muscles were seen in the APA phase while standing asymmetrically with narrow base of support. The findings highlight the importance of investigating the role of body asymmetry in maintaining control of vertical posture. The outcome of the study provides a foundation for future studies focusing on improvement in postural control in individuals with body asymmetry due to unilateral weakness.