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Comparison of the thicknesses of three abdominal muscles. (A) at rest, (B) protocol A; stimulation of abdominal muscles, (C) protocol A+B; concurrent stimulation of abdominal and lumbar muscles, (D) protocol B; stimulation of lumbar muscles. OE: obliquus externus muscle, OI: obliquus internus muscle, TrA: transversus abdominis muscle
