Question

During running, are lower extremity muscles working eccentrically, concentrically, or both? Why? *Please answer both parts. Thank you!

Answer 1

During running, the eccentric muscles are quadriceps inorder to have provide a grip strength after the flexion of the hip and when striking the ground ( swing phase). The concentric muscles in the leg during running are rectus femoris and illiopsoas muscles to flex or bend the thigh at the hip to move forwards during running.
   The quadriceps muscle will go for both the concentric and eccentric contraction. During when the runner descends or trying to reduce the speed, the quadriceps muscle goes for essentric contraction and since quadriceps is an anti gravity muscle, inorder to extend the knee during the running phase, the muscle goes for concentric contraction.