Figure 10. The lower extremity muscle co-activation during the descending phase. Descending phase: Initial contact to maximum knee flexion; H = Uninjured control group; C = Copers group; I = CAI group; GM = gluteus medius; RF = rectus femoris; VM = vastus medialis; BF = biceps femoris; TA = tibialis anterior; PL = peroneus longus; MG = medial gastrocnemius; S = soleus. * p < 0.05.