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Context :  Electrical muscle stimulation (EMS) was designed for artificial muscle activation or superimposed training.   Objectives :  To compare the effects of 8 weeks of superimposed technique (ST; application of electrical stimulation during a voluntary muscle action) and EMS on the cross-sectional area of the rectus abdominis, lateral abdominal wall, and on lumbopelvic control.   Setting :  University research laboratory.   Design :  Randomized controlled trial.   Participants :  Fifty healthy subjects were recruited and randomly assigned to either the ST or EMS group.   Intervention :  The participants engaged with the electrical stimulation techniques (ST or EMS) for 8 weeks.   Main Outcome Measures :  In all participants, the cross-sectional area of the rectus abdominis and lateral abdominal wall was measured by magnetic resonance imaging and lumbopelvic control, quantified using the single-leg and double-leg lowering tests.   Results :  There were no significant differences in the cross-sectional area of the rectus abdominis (right:  P  = .70, left:  P  = .99) or lateral abdominal wall (right:  P  = .07, left:  P  = .69) between groups. There was a significant difference between groups in the double-leg lowering test ( P  = .03), but not in the single-leg lowering test ( P  = .88). There were significant differences between the preintervention and postintervention in the single-leg ( P  &lt; .001) and double-leg lowering tests ( P  &lt; .001).   Conclusions :  ST could improve lumbopelvic control in the context of athletic training and fitness.

Effect of Abdominal Electrical Muscle Stimulation Training With and Without Superimposed Voluntary Muscular Contraction on Lumbopelvic Control