Abstract

Purpose

To obtain preliminary data on the effect of a textured insole on postural control.

Methods

Nine healthy subjects were exposed to external perturbations applied to their shoulders while standing with or without a single textured insole. Body weight distribution and bilateral electromyographic activity (EMG) of trunk and leg muscles were recorded. Onsets of EMG activity of muscles were calculated and analyzed within the interval typical for anticipatory postural adjustments.

Results

When a textured insole was provided under one foot, subjects shifted their body weight towards the contralateral foot. With no insole, the anticipatory onsets of EMG activity of the left and right muscles were symmetrical; when a textured insole was used, the EMG onsets of the muscles on the contralateral side of the body were seen earlier as compared to the insole side. This early activation was more pronounced in the trunk muscles (p < 0.05).

Conclusions

Using a single textured insole under one-foot induced asymmetry of anticipatory onsets of EMG activity in healthy subjects. The outcome highlights the importance of investigating the role of a single textured insole in control of vertical posture and provides a foundation for future studies focussed on improvement of postural control in individuals with body asymmetry due to unilateral weakness.

中文翻译：

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纹理鞋垫对预期姿势调整的影响

摘要

目的

获得有关纹理鞋垫对姿势控制的影响的初步数据。

方法

九名健康受试者在站立或不使用单个纹理鞋垫时暴露于施加到肩部的外部扰动。记录躯干和腿部肌肉的体重分布和双侧肌电活动 (EMG)。在典型的预期姿势调整间隔内计算和分析肌肉的 EMG 活动的开始。

结果

当在一只脚下提供有纹理的鞋垫时，受试者将他们的体重转移到对侧脚。在没有鞋垫的情况下，左右肌肉的 EMG 活动的预期开始是对称的；当使用带纹理的鞋垫时，与鞋垫侧相比，可以更早地看到身体对侧肌肉的 EMG 发作。这种早期激活在躯干肌肉中更为明显（p  < 0.05）。

结论

在健康受试者中，在一只脚下使用单一纹理鞋垫会导致 EMG 活动的预期开始不对称。结果强调了研究单一纹理鞋垫在控制垂直姿势中的作用的重要性，并为未来的研究奠定了基础，重点是改善因单侧无力导致身体不对称的个体的姿势控制。