Analysis of Postural Adjustment Responses to Perturbation Stimulus by Surface Tilts in the Feet-together Position
Analysis of Postural Adjustment Responses to Perturbation Stimulus by Surface Tilts in the Feet-together Position
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DOI：
10.5405/jmbe.867
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发表时间：
2011-08
影响因子：
2
通讯作者：
Y. Maeda;Toshiaki Tanaka;Y. Nakajima;K. Shimizu
中科院分区：
文献类型：
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作者：
Y. Maeda;Toshiaki Tanaka;Y. Nakajima;K. Shimizu
支撑基础（BOS）影响人类直立站立的姿势控制。由于在直立位置狭窄的BOS使姿势控制困难，因此评估和练习狭窄BOS的平衡非常重要。我们进行了一项实验研究，以澄清的姿态控制机制，在一个脚在一起的立场，在动态扰动。受试者为10名健康的年轻人。使用电动操作平台，倾斜扰动施加到站在双脚并拢的位置的受试者。扰动是在四个方向：向后，向前，向右，向左。利用运动分析系统和肌电图（EMG），我们同时测量了三维姿势变化和七个肌肉的躯干和腿部的EMG。通过运动分析获得关节角度变化，通过肌电图获得下肢肌肉活动和潜伏期的积分值。在俯仰倾斜方面，观察到踝关节策略：这涉及踝关节肌肉的同时收缩，就像在直立位置一样。相反，在侧倾倾斜方面，观察到“配重”。我们还观察到对狭窄BOS的姿势控制的变化。我们发现，不像脚分开的位置，脚在一起的位置，缩小的BOS在左右方向的原因是一个显着的变化，使姿势控制策略仅在响应侧倾倾斜扰动困难。今后，我们需要研究平衡训练的有效性，包括在双脚并拢的位置，在提高左右方向的平衡能力的滚动倾斜。
Base of support (BOS) influences the postural control of upright standing in humans. Since a narrowed BOS in the upright position makes postural control difficult, it is important to evaluate and practice balance with a narrowed BOS. We performed an experimental study to clarify the postural control mechanism in a feet-together position in response to dynamic perturbations. Subjects were 10 healthy young adults. Using an electrically operated platform, tilting perturbation was applied to subjects standing in feet-together position. Perturbation was in four directions: backward, forward, right, and left. Using a motion analysis system and electromyography (EMG), we simultaneously measured the three-dimensional postural change and EMG of seven muscles of the trunk and legs. We obtained joint angular change from the motion analysis and the integrated values of muscle activity and latency of the lower extremities from the EMG. In terms of pitch tilt, the ankle strategy was observed: this involved simultaneous contraction of the ankle muscles as usual in the upright position. In contrast, in terms of roll tilt, ”counterweighting” was observed. We also observed a change in postural control to respond to the narrowed BOS. We found that, unlike the feet-apart position, the feet-together position, narrowing the BOS in the left-right direction causes a prominent change and makes postural control strategy difficult only in response to roll tilt perturbations. In the future, we need to investigate the effectiveness of balance training including roll tilting in the feet-together position in improving balance ability in the left-right direction.