The aim of this study is to investigate the behavior of depolarization of motor units in isometric contractions, according to the angles of the joint range of motion in the exercise of elbow flexion in Scott bench. This study consisted of 20 male volunteers with a mean age of 22.5 ± 3.5 years, no diagnosis of musculoskeletal diseases and physically active. We analyzed the values of electromyographic and isometric torque in external angles of 30°, 45°, 60° and 90°. Each subject performed using a repetition maximum strength for each range of motion for 10 seconds. The result of this study showed that the 90° angle isometric had a greater and greater depolarization of the motor units compared to most studied ranges of motion, thus making this position support a greater load imposed on the segment by a longer period of time.
