Fig. 5
From: Muscle function and fatigability of trunk flexors in males and females
EMG of the rectus abdominis during the fatiguing task. Mean (±SEM) RMS EMG (expressed as percent of maximal RMS EMG, %) of the rectus abdominis during submaximal trunk flexion contractions across the fatiguing protocol. Rectus abdominis EMG increased over time (p < 0.05) for both sexes (p > 0.05) with no sex difference (p > 0.05)