Comparison of Muscle Activities of Lower Limb according to Foot Width during Lateral Step-up and Step-down Motion: Repeated Measures Design

PURPOSE:This study was conducted to investigate the most effective foot width for activating the lower extremity muscles during the lateral step-up and step-down motion according to three different foot positions. METHODS:In this single-blinded comparative study, a total of 28 adults performed the lateral step-up and step-down motion with feet positioned at 100% of shoulder width, 75% of shoulder width, and 50% of shoulder width.Surface electromyography (EMG) data were collected from the gluteus maximus (Gmax), gluteus medius (Gmed), vastus lateralis (VL), vastus medialis (VM), and biceps femoris (BF).