Figure 3From: Neuromuscular adaptations after a rehabilitation program in patients with chronic low back pain: case series (uncontrolled longitudinal study) Feedforward gain measured for each muscle over time. D: day; RA: rectus abdominis, OE: obliquus externus; LES: lumbar erector spinae. Feedforward gain is calculated as a percentage of variation: % variation = EMG amplitude t – 0.05 sec – EMG amplitude t-1sec / EMG amplitude t-1sec * 100.Back to article page