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Objectives To evaluate the effect of lumbopelvic belts on the thickness of lateral abdominal muscles and the cross-sectional area (CSA) of lumbar multifidus (LM) muscles.Methods This study was a single-blinded randomized controlled trial.Sixty healthy volunteers with no history of low back pain in the previous year were allocated into belt and control groups.Lumbar belts were given to the subjects in the belt group,and they were asked to use the belts during the study period except during sleeping hours.The subjects were assessed at baseline and at 4 and 8 weeks.