In Maximum Velocity late support concentric plantar flexion, what is the primary effect?

In Maximum Velocity late support concentric plantar flexion, what is the primary effect?

• A. Aids in propulsion.
• B. Propels center of gravity forward.
• C. Absorbs landing shock.
• D. Rotates trunk for takeoff.

Answer: (A)

During late support, the ankle plantar flexors contract concentrically to push the ground backward. That action creates a reaction force with a forward component, which drives the body forward and increases the forward velocity of the center of mass. The primary effect here is propulsion—the push-off that supplies the forward impulse needed for sprint speed. Absorbing landing shock comes mainly from the eccentric actions earlier in stance, not from this concentric plantar flexion, and rotating the trunk for takeoff is a separate, less direct consequence of overall sprint mechanics. In maximal velocity sprinting, powerful concentric plantar flexion at late stance provides the key propulsive impulse that speeds you up.

During late support, the ankle plantar flexors contract concentrically to push the ground backward. That action creates a reaction force with a forward component, which drives the body forward and increases the forward velocity of the center of mass. The primary effect here is propulsion—the push-off that supplies the forward impulse needed for sprint speed. Absorbing landing shock comes mainly from the eccentric actions earlier in stance, not from this concentric plantar flexion, and rotating the trunk for takeoff is a separate, less direct consequence of overall sprint mechanics. In maximal velocity sprinting, powerful concentric plantar flexion at late stance provides the key propulsive impulse that speeds you up.