The Effect of Foot Position on the Muscles Activity of the Shoulder and Trunk Muscles in Load Lifting

Objective: This study aimed to investigate the effects of leg positioning on the activity of shoulders and body while lifting weights. Methods: Employing an electromyography set (BTS free EMG 300) and surface electrodes, the activity of such muscles as biceps, triceps, anterior, medial and posterior deltoid, trapezius and erector spinae, while lifting a weight weighing %15 of body mass, in three leg positions (straight, bending and a leg on a step), were measured. Each muscle`s RMS data, during performing the skills, were divided by the amount of maxinmum voluntary isometric contraction (MVIC) then multiplied by 100. Repeated Measurewas used to analysis the data at the significance level of (p