Relative change in integrated electromyography (EMG) 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 eight subjects. Data were averaged across six cycles and normalized to mean of integrated EMG activity across four phasing conditions: phase 0, hip and knee joints are in same phase; phase 0.50, hip and knee joints are out of phase; phase 0.25, hip is 1/4 cycle (90°) earlier than knee joint; phase 0.75, hip is 1/4 cycle (90°) later than knee joint. Data represent mean ± standard deviation. *Significant

difference (p < 0.05).

Ming Wu, PhD; et.al