The primary hip extensor action during loading response is described as which?

The primary hip extensor action during loading response is described as which?

• A. Eccentric dorsiflexors
• B. Isometric/concentric hip extensors
• C. Eccentric hip flexors
• D. Concentric quadriceps only

Answer: (B)

During loading response, the body accepts weight and gravity tends to flex the hip. The hip extensors (gluteus maximus and hamstrings) counter this by generating an extension moment at the hip. They mostly hold the hip position (isometric) and may actively shorten to extend the hip (concentric) as weight shifts onto the limb. This control helps stabilize the pelvis and trunk as you move onto the foot. Eccentric hip flexor action would promote more flexion, which isn’t the goal here, and the ankle dorsiflexors or quadriceps alone don’t describe the primary hip action.

During loading response, the body accepts weight and gravity tends to flex the hip. The hip extensors (gluteus maximus and hamstrings) counter this by generating an extension moment at the hip. They mostly hold the hip position (isometric) and may actively shorten to extend the hip (concentric) as weight shifts onto the limb. This control helps stabilize the pelvis and trunk as you move onto the foot. Eccentric hip flexor action would promote more flexion, which isn’t the goal here, and the ankle dorsiflexors or quadriceps alone don’t describe the primary hip action.