The Dynamic electromyography of voluntary repetitive movements: Processing techniques and interference reduction
Processing techniques suited to the electromyographic signals evoked for dynamic contractions is proposed in this paper. EMG signals were recorded from the shoulder muscles (middle, anterior and posterior deltoids) and the trapezius muscle, during voluntary / repetitive arm movements and under different kinematic and dynamic conditions. The correlations between the myographic activity and arm position, and its alterations due to muscular fatigue were analyzed. Independent component analysis was implemented in order to reduce crosstalk interference of neighboring muscles. It was determined that the effects of fatigue observed during movements with load are influenced by the crosstalk interference, causing underestimates in the muscular fatigue measures.