Quantifying dynamic and postural balance difficulty during gait perturbations using stabilizing/destabilizing forces

Area of Science:

• Biomechanics
• Gait Analysis
• Motor Control

Background:

• Quantifying the intensity of balance exercises is challenging for effective fall risk reduction.
• Gait perturbations are commonly used in balance training, but their difficulty is poorly measured.

Purpose of the Study:

• To assess the utility of stabilizing/destabilizing forces in quantifying balance difficulty during gait perturbations.
• To compare balance difficulty during perturbed gait versus unperturbed gait.

Main Methods:

• Ten healthy subjects walked on a split-belt treadmill with controlled speed perturbations.
• Kinetic and kinematic data were collected to calculate stabilizing/destabilizing forces.
• Balance difficulty was measured during perturbation and recovery steps.

Main Results:

• Higher stabilizing and lower destabilizing forces correlated with increased balance difficulty.
• Difficulty increased proportionally with perturbation intensity.
• Perturbed gait showed significantly higher balance difficulty than fast-speed unperturbed gait.

Conclusions:

• Stabilizing/destabilizing forces provide a valid measure of balance difficulty during gait perturbations.
• These forces can inform the optimal intensity for balance rehabilitation programs.
• This quantification method aids in tailoring exercises for fall prevention.