What is an example of a perturbation in perturbation-based balance training (PBT)?

• A. Seated perturbations.
• B. Random surface translations or pushes during standing or walking.
• C. Visual perturbations only.
• D. Fixed predictable perturbation applied every trial.

Answer: (B)

In perturbation-based balance training, the key idea is to expose the balance system to unexpected disturbances so it learns to adjust quickly and adaptively. Random surface translations or pushes during standing or walking create unpredictable mechanical disturbances that force you to integrate sensory information and recruit appropriate motor responses to maintain stability. This variability trains more robust, transferable strategies for real-life balance challenges.

Seated perturbations don’t challenge standing balance, so they don’t train the same reactive control. Visual perturbations alone alter perception but don’t mechanically destabilize the body. A fixed, predictable perturbation each trial doesn’t mimic real-world, unpredictable disturbances and tends to elicit a rehearsed response rather than adaptable ones.