An Electromyographic Study of the Shoulder Joint with a Computer

Abstract

From the resting position, the movements of flexion, extension and abduction of the shoulder joint were performed.
The muscles tested were the trapezius, deltoideus, pectoralis major, coracobrachialis, latissimus dorsi, and biceps brachii muscles.
The electromyography and joint movement were recorded simultaneously using a FM data recorder.
The regression line of electromyogram on joint movement was plotted with a computer, and the coefficient of regression of electromyogram on joint movement was computed. The regression lines were clasified into six types according to the electromyograms of the beginning and the end of the movements.