Rotator cuff tendinopathy alters the muscle activity onset and kinematics of scapula

This study aimed to determine whether alteration in scapular kinematics is associated with deficits in the activity onset of scapular muscles. Forty-three male volleyball players (17 asymptomatic and 26 with RC tendinopathy) joined the study. Three-dimensional scapular kinematics was quantified using an acromial marker cluster method. The activity onset of the upper (UT), middle (MT), and lower trapezius (LT), and serratus anterior (SA) during arm abduction was assessed with electromyography.

Source: Journal of Electromyography and Kinesiology - May 30, 2017 Category: Neurology Authors: Hio Teng Leong, Gabriel Yin-fat Ng, Shing Chung Chan, Siu Ngor Fu Source Type: research