CHANGES IN UPPER EXTREMITY MUSCLE ACTIVATION IN THE PRESENCE OF STRESS

Abstract

This study examined the muscle activity of the flexor digitorum (FD), biceps brachii (BB), triceps brachii (TB), and pectoralis major (PM) during the American football throw with and without conditions of stress. Male subjects (n=5) with either football or baseball experience threw footballs at targets with distances of 12.91 m, 18.29 m, and 28.91 m. Throwing arm muscle activity was assessed via electromyography. Results showed that the flexor digitorum muscle had lower muscle activation for the stress condition at the long distance along with the pectoral muscle at the middle distance.