The elbow flexion is a movement that can be trained and that resistance exercises are essential for improving the strength of muscle contraction. To determine the force being carried by the muscle during contraction is necessary to calculate the torque. While this is to analyze how the behavior is used myoelectric electromyography. Therefore, the objective of the study is to recognize patterns of electromyographic signals in the frequency domain in an isometric contraction of elbow flexion in the biceps curl machine at angles of 30°, 45°, 60° and 90°. For this study we used 20 male participants with a mean age of 22.5 ± 3.5 years, no diagnosis of musculoskeletal diseases and physically active. Among the results noted that the external torque at the angle of 90° is larger compared to other angles, and the median frequency decrease. In median frequency pattern, maximal voluntary isometric contraction (10 sec), can see the dip in form, i.e., it is possible to reach the neuromuscular fatigue in this type of contraction. And the median frequency has a crush on all fragments of angles, following the initial to the final, except in the 90º, which was statistically no difference seen.
