2. Methods
SECONDARY
This study was a single-blinded (outcome assessor), prospective, randomized controlled trial using a parallel group design conducted in a single center from January 2022 to February 2022. Forty-one healthy young volunteers were recruited and randomized into 2 groups: a group (n = 21) that performed 8 weeks of strengthening exercise with EMS (S + E group) and a group (n = 20) that performed only 8 weeks of strengthening exercise (S group). A computer-generated list of random allocations was used, and the randomization results were blinded to the assessment staff. Changes in muscle thickness on ultrasound, including the abdominal, gluteal, and hip adductor muscles were selected as the primary outcome measure. For secondary outcomes, changes in physical performance and body composition were evaluated. All assessments were performed twice: before the intervention and after 8 weeks of intervention.