The phase that includes eccentric braking and concentric propulsion is the what?

The phase that includes eccentric braking and concentric propulsion is the what?

• A. Single-leg support
• B. Flight
• C. Recovery
• D. Start in Sprinting

Answer: (A)

During sprinting, the battleground of force production is the stance on one leg. When the foot lands, the leg absorbs impact and slows the forward momentum through eccentric braking, controlling how quickly you decelerate horizontally. As the body loads through the stance and then moves through extension, the muscles switch to concentric action to push off, generating propulsion to carry you into the next flight. This sequence happens within the single-leg support phase, where one leg is in contact with the ground as the other leg is in swing. The flight phase, by contrast, has both feet off the ground, so there’s no ground-based braking or propulsion. The recovery (swing) phase involves moving the leg forward for the next contact with little emphasis on braking or propulsion, and the start in sprinting refers to early acceleration out of the blocks, not the continuous braking‑then‑propulsion pattern that occurs during stance. So the phase that includes both eccentric braking and concentric propulsion is the single-leg support phase.

During sprinting, the battleground of force production is the stance on one leg. When the foot lands, the leg absorbs impact and slows the forward momentum through eccentric braking, controlling how quickly you decelerate horizontally. As the body loads through the stance and then moves through extension, the muscles switch to concentric action to push off, generating propulsion to carry you into the next flight. This sequence happens within the single-leg support phase, where one leg is in contact with the ground as the other leg is in swing. The flight phase, by contrast, has both feet off the ground, so there’s no ground-based braking or propulsion. The recovery (swing) phase involves moving the leg forward for the next contact with little emphasis on braking or propulsion, and the start in sprinting refers to early acceleration out of the blocks, not the continuous braking‑then‑propulsion pattern that occurs during stance. So the phase that includes both eccentric braking and concentric propulsion is the single-leg support phase.