What are anticipatory postural adjustments (APAs) and provide an example during gait initiation?

• A. APAs are pre-emptive muscle activations to prepare for a movement; e.g., pre-activation of distal leg and trunk muscles before stepping to shift the COM and maintain stability.
• B. APAs occur after movement to regain balance.
• C. APAs are reflexive leg kicks.
• D. APAs are conscious visual cues prior to movement.

Answer: (C)

Anticipatory postural adjustments are pre-emptive activations of postural muscles that prepare the body for a forthcoming movement, helping to position the center of mass and center of pressure so balance is maintained as you start the action.

During gait initiation, just before the first step, there is a coordinated burst of activity in distal leg and trunk muscles. This pre-step activation shifts the center of pressure and prepares the body to move forward, creating the necessary momentum while keeping stability as the stepping leg lifts. For example, a brief pre-activation of muscles around the ankle and trunk occurs before stepping to reposition weight and balance.

These adjustments happen before movement begins and are not reflexive kicks or conscious visual cues.