In maximum velocity sprinting, which phase features concentric hip flexion that accelerates the thigh forward?

In maximum velocity sprinting, which phase features concentric hip flexion that accelerates the thigh forward?

• A. Early flight
• B. Mid flight
• C. Late flight
• D. Early support

Answer: (B)

In maximum velocity sprinting, the thigh is advanced toward the front of the body by the hip flexors shortening and pulling the thigh forward in a concentric contraction. This action happens during the swing phase when the leg is off the ground and moving from behind toward ahead. The middle portion of the swing (mid flight) is when this hip-flexor action is most actively accelerating the thigh forward, helping position the foot for an efficient, quick ground contact. Early flight is dominated more by the leg just coming off the ground and the momentum of the leg, while late flight shifts toward positioning for foot strike, with less emphasis on rapid concentric hip flexion. Early support involves the leg on the ground, where propulsion and braking come from ground reaction forces rather than hip flexor-driven swing.

In maximum velocity sprinting, the thigh is advanced toward the front of the body by the hip flexors shortening and pulling the thigh forward in a concentric contraction. This action happens during the swing phase when the leg is off the ground and moving from behind toward ahead. The middle portion of the swing (mid flight) is when this hip-flexor action is most actively accelerating the thigh forward, helping position the foot for an efficient, quick ground contact. Early flight is dominated more by the leg just coming off the ground and the momentum of the leg, while late flight shifts toward positioning for foot strike, with less emphasis on rapid concentric hip flexion. Early support involves the leg on the ground, where propulsion and braking come from ground reaction forces rather than hip flexor-driven swing.