Which statement correctly describes an action during Maximum Velocity late support and its effect?

Which statement correctly describes an action during Maximum Velocity late support and its effect?

• A. Concentric knee extension propels the center of gravity forward.
• B. Eccentric plantar flexion decelerates hip extension.
• C. Concentric hip extension rotates the trunk.
• D. Brief concentric knee flexion propagates forward rotation.

Answer: (A)

During maximum-velocity late support the leg is in near-full extension and acts as the primary lever for push-off. The knee extends concentrically, with the quadriceps actively straightening the leg to drive the body forward. This knee extension contributes to propelling the center of gravity forward because the leg pushes backward against the ground, producing a forward reaction force on the body. While the ankle plantarflexors are the main contributors to propulsion, the knee’s concentric extension still adds to the forward drive in this phase. The other described actions don’t align with late-support propulsion: plantar flexion is typically a force in the push-off rather than an eccentric deceleration, hip extension effects aren’t about trunk rotation in this context, and knee flexion during this phase would reduce forward propulsion.

During maximum-velocity late support the leg is in near-full extension and acts as the primary lever for push-off. The knee extends concentrically, with the quadriceps actively straightening the leg to drive the body forward. This knee extension contributes to propelling the center of gravity forward because the leg pushes backward against the ground, producing a forward reaction force on the body. While the ankle plantarflexors are the main contributors to propulsion, the knee’s concentric extension still adds to the forward drive in this phase. The other described actions don’t align with late-support propulsion: plantar flexion is typically a force in the push-off rather than an eccentric deceleration, hip extension effects aren’t about trunk rotation in this context, and knee flexion during this phase would reduce forward propulsion.