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Average EMG activity (±SD) of the VL, BF, and Glut muscles during the first half of the stance and the end-of-swing phase for all the right leg steps of the sprint acceleration. VL, vastus lateralis; RF, rectus femoris; BF, biceps femoris; Glut, gluteus maximus; MVIC, maximal voluntary isometric contraction. The effect of “step number” over the entire acceleration were tested by One-way analyses of variance: *, ANOVA significant main effect (P < 0.05); ns, not significant.
