# Dynamic balance control in healthy young women during stair descent: a plantar pressure-based study

## TL;DR

This study examines how young women adjust their foot pressure and balance when descending stairs of different heights, focusing on injury risk and balance control.

## Contribution

The study reveals how increasing step height affects plantar pressure and balance control in young women during stair descent.

## Key findings

- Higher step heights significantly increased medial-lateral and anterior-posterior COP adjustments.
- At 5 cm step height, landing strategy shifted from hindfoot to forefoot.
- Dominant foot showed better postural balance control than non-dominant foot.

## Abstract

Women are more likely to fall or even die when the ladder falls, which seriously affects the quality of daily life. It is necessary to better understand the plantar mechanism of the ladder falls and put forward reasonable suggestions.

Twenty healthy young women volunteered to participate in the experiment. The study used the F-scan plantar pressure to explore the difference in the plantar pressure in the dominance of the leading foot across four step descent height conditions. The landing strategy employed was recorded during the experiment. The Center of Pressure (COP), along with its medial-lateral (ML) and anterior-posterior (AP) adjustment velocities, and the V
COP, R
COP-ML, and R
COP-AP were analyzed.

With an increase in the step height, significant enhancements were observed in the V
COP-ML (p < 0.001), V
COP-AP (p < 0.001), R
COP-ML (p < 0.001), and R
COP-AP (p < 0.001) during landing. There was no significant difference in the kinematic parameters of plantar pressure during stair descent, regardless of whether the dominant foot or non-dominant foot was the leading foot.

This study found that among young women, an increase in step height during descent significantly affected the plantar pressure and led to greater COP adjustment in the directions of ML and AP, increasing the risk of injury. At a step height of 5 cm, the first choice of the landing strategy for female subjects began to change from the hindfoot to the forefoot. Although there were no significant differences in plantar pressure data and landing strategies between subjects using the dominant side and nondominant side as the forefoot, the dominant side forefoot exhibited better postural balance control than the nondominant side forefoot.