Fig. 1. Experimental setup. (A) Participants self-initiated falls and landed sideways on a 30 cm thick mattress. The falling trials involved one of three knee positions at the time of hip impact: (B) knee on the mat, (C) knee free of constraint, and (D) knee contacts the contralateral knee. The activity of hip muscles, fall kinematics and kinetics were measured through surface electromyography, motion capture system and force plate, respectively, during a fall. EMG, electromyography.
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