is the hamstring in knee extension concentric contraction?
No, the hamstring is not in a concentric contraction during knee extension. During knee extension, the quadriceps muscle group located on the front of the thigh contracts concentrically to straighten the knee while the hamstring muscles located on the back of the thigh relaxes. However, during knee flexion (bending of the knee), the hamstring muscles contract concentrically while the quadriceps muscles relax.
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