During push off, shortening of the ankle plantar flexors creates what?

During push off, shortening of the ankle plantar flexors creates what?

• A. Knee flexion torque only
• B. Ankle plantarflexion torque for forward propulsion
• C. Hip flexion torque only
• D. Rearfoot eversion only

Answer: (B)

During push-off, the ankle plantar flexors shorten to produce plantarflexion torque at the ankle. This torque drives the foot downward and pushes against the ground. The ground responds with a forward reaction force, propelling the body ahead into the next step. The key idea is that the propulsive power comes from ankle plantarflexion generated by those muscles, even though these muscles cross the knee and can influence knee mechanics as well. The other options describe torques or movements at different joints or a foot posture change that aren’t the primary source of forward propulsion during push-off.

During push-off, the ankle plantar flexors shorten to produce plantarflexion torque at the ankle. This torque drives the foot downward and pushes against the ground. The ground responds with a forward reaction force, propelling the body ahead into the next step. The key idea is that the propulsive power comes from ankle plantarflexion generated by those muscles, even though these muscles cross the knee and can influence knee mechanics as well. The other options describe torques or movements at different joints or a foot posture change that aren’t the primary source of forward propulsion during push-off.