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Raw EMG signals for vastus lateralis (VL), gluteus maximus (Glut), biceps femoris (BF), and rectus femoris (RF) muscles, synchronized with vertical GRF during a typical sprint stride (7th stride of a maximal 6-s acceleration). The following phases for EMG analysis were determined from vertical GRF data (30 N threshold): entire swing, end-of-swing, entire stance, and first half of the stance.
