Background

Poor postural stability is associated with chronic ankle instability. Previous research showed an effect of foot type on postural stability. However, the specific effect of supinated feet remains unclear.

Research question

Our study aimed to assess the effect of foot type on postural stability, while taking potential confounding effects of body mass and body height into account.

Methods

Forty-three healthy participants between 18 and 40 years old performed barefooted single leg stance tests with eyes open (EO) and closed (EC) on solid ground, and on a balance board (BB). Foot type was determined from pressure recordings during gait, using the arch index. Ground reaction forces were measured using a force plate. Outcome measures were Center of Pressure Velocity (COPV) divided by body height, and the Horizontal Ground Reaction Force (HGRF) divided by body mass. Generalized Estimating Equations models assessed the differences between supinated, normal and pronated feet during EO, EC and on a BB.

Results

During EO an interaction between supinated feet and body mass showed an increase of COPV with 0.03 × 10^-2 1/s per kilogram of mass relative to normal feet (p = .03). During EC this interaction was more pronounced with 0.22 × 10^-2 1/s increase per kilogram mass (p < .01). The HGRF did not differ between foot types in any of the conditions.

Significance

Supinated feet have a larger increase in COPV compared to normal feet with increasing mass when standing on solid ground during EO and EC. This indicates that people with supinated feet and a higher mass are less stable during single leg stance.

Level of evidence

Level 3, associative study.

中文翻译：

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脚型，身长和体重对姿势稳定性的影响。

背景

姿势不佳与慢性踝关节不稳有关。先前的研究表明脚型对姿势稳定性有影响。但是，仰卧脚的具体作用仍不清楚。

研究问题

我们的研究旨在评估脚型对姿势稳定性的影响，同时考虑体重和身高的潜在混杂影响。

方法

年龄在18至40岁之间的43名健康参与者进行了赤脚单腿站姿测试，并在坚实的地面和平衡板（BB）上睁开眼睛（EO）和闭眼（EC）。使用足弓指数从步态期间的压力记录中确定足部类型。使用测力板测量地面反作用力。结果是压力速度中心（COPV）除以身高，水平地面反作用力（HGRF）除以体重。广义估计方程模型评估了EO，EC和BB期间平卧脚，正常脚和旋前脚之间的差异。

结果

在EO期间，与正常脚相比，仰卧脚与体重之间的相互作用表明COPV增加了0.03×10 ^-2 1 / s / kg质量（p  = .03）。在EC期间，这种相互作用更加明显，每千克质量增加0.22×10 ^-2 1 / s（p  <.01）。在任何情况下，脚型的HGRF均无差异。

意义

与普通脚相比，pin缩脚在EO和EC站立于坚实地面时，其COPV增大幅度更大。这表明单脚站立姿势时，双脚平卧且体重较高的人不稳定。

证据水平

3级，联想学习。