EMG Profile of Dominant Arm Muscles in Standing Shot put

Abstract

This study aims to detect the electro muscle activity for the agonist and antagonist muscles of the dominant arm with the correlated arm joint angles; to evaluate the efficacy of training with lighter weight puts on the safety of the arm joints. Seven (7) elite, right-handed athletes performed 2 trials using 2 different weights shot put (4kg-7.26kg). The athletes experienced 3D motion analysis to target arm joint with EMG analysis of 8 muscles in the dominant arm, with detecting angles of shoulder, elbow, and wrist joints. Statistical significant differences were recorded at a Significance of 0.05, between the averages data of maximum integration moment in all muscles during the whole throwing performance, for 4kg and 7.26kg weights, except the Pectoralis major muscle. The ranking of arm muscle area of activation was deltoid anterior with 38.05%, flexor carpi radialis with 42.43%, biceps brachii with 19.99%, extensor carpi radialis with 22.24%, triceps brachii with 26.59%, lower trapezius with 11.75%, deltoid posterior with 12.1130%, and the least contribution was for the pectoralis major with 7.62%, all for the sake of higher weight put. Lighter weight shot putting was then characterized by the high speed of release in lesser shoulder angle, higher elbow angle and lesser wrist angle, whereas higher weight shot was characterized with delayed release in higher shoulder angle, high elbow angle, and higher wrist angle, with a balanced activation of agonistic/antagonistic muscle function.