Fig. 6From: Compensatory muscle activation and spinal curve changes in response to fatigue among adolescent male athletesThe average change in the median frequency (MDF) of the 11 selected muscles’ EMG from a representative participant. MDF traces were smoothed by a 3-size moving average window to increase visual clarity. A decreasing slope of the regression line (red) was considered muscle fatigue, where a greater negative slope corresponded to a greater degree of muscle fatigueBack to article page