1. The rectus femoris , a large muscle in the quadriceps, is typical. 2. During incline running increases in activation of the rectus femoris and gastrocnemius were noted by Cai. 3. However, the rectus femoris moment arm is greater over the knee than the hamstring knee moment. 4. This means that contraction from both rectus femoris and hamstrings will result in hip and knee extension. 5. In January 2013 he was injured in rectus femoris muscle and missed the rest of the season. 6. The rectus femoris is a direct antagonist to the hamstrings, at the hip and at the knee. 7. The rectus femoris biarticular muscle acting over the hip has a smaller hip moment arm than the hamstrings. 8. Rectus femoris can be torn which can be extremely painful and potentially debilitating if there is a complete rupture.9. Hip extension also adds a passive stretch component to rectus femoris , which results in a knee extension force. 10. The anterior side of the hip exhibits primarily hip flexion with help from the rectus femoris , iliopsoas, pectineus, and gracilis.
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