During Maximum Velocity late support, which action primarily propels the center of gravity forward?

During Maximum Velocity late support, which action primarily propels the center of gravity forward?

• A. Concentric knee extension.
• B. Eccentric hip flexion.
• C. Concentric plantar flexion.
• D. Brief concentric knee flexion.

Answer: (A)

During maximum velocity late support, propulsion mainly comes from the trailing leg extending the knee quickly. This concentric knee extension straightens the leg and allows a powerful push against the ground, creating a backward ground reaction force that moves the center of gravity forward. The action is powered by the quadriceps and occurs as the leg is behind the body, driving forward momentum. Eccentric hip flexion would tend to slow or control the leg’s path rather than propel it forward, brief concentric knee flexion would shorten the lever and reduce forward impulse, and while plantarflexion helps push off, the dominant forward propulsion in this phase is produced by the knee extension.

During maximum velocity late support, propulsion mainly comes from the trailing leg extending the knee quickly. This concentric knee extension straightens the leg and allows a powerful push against the ground, creating a backward ground reaction force that moves the center of gravity forward. The action is powered by the quadriceps and occurs as the leg is behind the body, driving forward momentum.

Eccentric hip flexion would tend to slow or control the leg’s path rather than propel it forward, brief concentric knee flexion would shorten the lever and reduce forward impulse, and while plantarflexion helps push off, the dominant forward propulsion in this phase is produced by the knee extension.