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Integrated electromyography activity of seven muscles: tibialis anterior (TA), medial gastrocnemius (MG), soleus (SOL), vastus medialis (VM), rectus femoris (RF), medial hamstrings (MH), and adductors (ADD) for 10 subjects. Five perturbation conditions are shown: combined hip and knee extension (CHKE), hip extension movement with knee extended (HEKE), hip extension movement with knee flexed (HEKF), knee extension movement with hip extended (KEHE), and knee extension movement with hip flexed (KEHF). Data represent mean ± standard deviation for 10 subjects during hold period of hip or knee extension. *Significant difference (p < 0.05). Ming Wu, PhD; et.al