Hip flexors are eccentrically active before toe-off because the hip is doing what at that time?

Hip flexors are eccentrically active before toe-off because the hip is doing what at that time?

• A. Maximally flexing
• B. Abducting only
• C. Internally rotating only
• D. Extending

Answer: (D)

Before toe-off, the hip is moving into extension as the leg pushes backward to propel the body forward. The hip flexors—while lengthening as the hip extends—act eccentrically to control that motion, keeping the extension from happening too quickly and helping absorb energy for a smooth transition to the swing phase. An abduction or internal rotation pattern isn’t the primary action driving toe-off, and maximal hip flexion would shorten the flexors, not lengthen them. So extending best describes the situation and explains why the hip flexors are eccentrically active.

Before toe-off, the hip is moving into extension as the leg pushes backward to propel the body forward. The hip flexors—while lengthening as the hip extends—act eccentrically to control that motion, keeping the extension from happening too quickly and helping absorb energy for a smooth transition to the swing phase. An abduction or internal rotation pattern isn’t the primary action driving toe-off, and maximal hip flexion would shorten the flexors, not lengthen them. So extending best describes the situation and explains why the hip flexors are eccentrically active.