Root Mean Square Value of the Electromyographic Signal in the Isometric Torque of the Quadriceps, Ha

Background: The surface electromyography (EMG) is a technique to capture and measure electrical activity and muscle action potential. It is applied to specify the production of force and to analyze muscle fatigue. The Root Mean Square (RMS) value has been used to quantify the electric signal because it reflects the physiological activity in the motor unit during contraction. Purpose: To evaluate a possible linear relationship between the RMS value of the EMG signal and the contraction force of the rectus femoris, vastus medialis, lateralis, biceps femoris, semitendinosus, and brachial biceps muscles. Methods: The analysis was performed on 24 females, university students with a mean age of 20 (± 6) years that practice physical activity regularly. The RMS value of the EMG signal of the mentioned muscles was measured during isometric contraction every 10 seconds with loads of 2, 4, 6, and 8 kilograms, and were normalized by the percentage in relation to the maximum isometric voluntary contraction (MIVC). The position of the volunteers during the analysis was standardized and the angle of the adjacent joint was monitored by an