Which phrase is associated with the goal of minimizing energy loss during sprinting?

Which phrase is associated with the goal of minimizing energy loss during sprinting?

• A. Minimal vertical impulse
• B. Minimal horizontal impulse
• C. Maximal ground contact
• D. Prolonged recovery

Answer: (A)

Minimizing energy loss in sprinting hinges on reducing the vertical work done with each ground contact. The vertical impulse—the area under the vertical ground reaction force during stance—corresponds to lifting and lowering the body’s mass. When this impulse is large, more energy is spent fighting gravity and then recapturing it, which slows you down. By keeping vertical impulse small, you lessen vertical movement and wasted energy, allowing more of the effort to go into forward, horizontal propulsion. The other options would either increase braking and energy loss (maximal ground contact), slow the cycle (prolonged recovery), or reduce forward drive (minimal horizontal impulse), none of which focus on cutting the vertical energy cost like minimizing vertical impulse does.

Minimizing energy loss in sprinting hinges on reducing the vertical work done with each ground contact. The vertical impulse—the area under the vertical ground reaction force during stance—corresponds to lifting and lowering the body’s mass. When this impulse is large, more energy is spent fighting gravity and then recapturing it, which slows you down. By keeping vertical impulse small, you lessen vertical movement and wasted energy, allowing more of the effort to go into forward, horizontal propulsion. The other options would either increase braking and energy loss (maximal ground contact), slow the cycle (prolonged recovery), or reduce forward drive (minimal horizontal impulse), none of which focus on cutting the vertical energy cost like minimizing vertical impulse does.