Effect of Vision and Surface Slope on Postural Sway in Healthy Adults: A Prospective Cohort Study

TL;DR

This study examines how vision and surface slope affect postural stability in healthy young adults.

Contribution

The study reveals that vision loss and surface inclination significantly impact postural sway in young adults.

Findings

Loss of visual input on inclined surfaces significantly increases postural instability.

Standing uphill with eyes closed is most challenging for postural stability.

Surface slope has a greater effect on postural sway than gender or BMI.

Abstract

Postural stability requires an interaction between cognitive, perceptual, sensory, and motor functions. Thus, impairment in any of these systems may affect postural balance. This study assessed the effect of visual input and surface slope on postural stability. The study was conducted on healthy participants, 11 females and 11 males who were 24–34 years of age. They were asked to perform still upright bipedal standing on flat and +/−20° sloped surfaces with eyes open (EO) and closed (EC). Six center of pressure (COP) parameters were measured by posturography. A significant relationship was observed between COP parameters, standing conditions, and body mass index. Gender had no significant effect on the COP. The loss of visual input within each standing condition did not affect the COP parameters. In contrast, differences were observed between standing on a flat surface and uphill with EC and between standing on a flat surface and downhill with EC and EO. When the participants were standing on inclined surfaces, the loss of vision significantly increased the postural instability. Young healthy adults demonstrated the greatest difficulty in standing uphill with EC. This was followed by standing downhill with EC and standing downhill with EO.

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