What is pre-motor planning in the context of gait initiation and APAs?

• A. Activation after movement onset.
• B. Visual planning for turning.
• C. Cognitive planning unrelated to motor activity.
• D. Planning and activation of muscles before movement onset to shift the COM and prepare for a stable start, reflecting anticipatory control.

Answer: (D)

Pre-motor planning in gait initiation and APAs is about anticipatory preparation: the brain plans and activates specific muscles before movement starts to shift the body's center of mass and create a stable base for stepping. This feed-forward control readies the postural system to counter the destabilizing effects of initiating movement, so the first step can begin smoothly. It reflects anticipatory control because the activation happens before the movement onset, not in response after the fact, and it directly involves coordinating muscle activity to adjust posture and propulsion. This is different from simply planning visually for turning or from cognitive planning that doesn’t involve motor commands.