Comparisons of electromyographic activity of scapular muscles between elevation and lowering of the arms.

The aim of this study was to compare the electromyographic (EMG) activity levels of the serratus anterior, upper, middle, and lower trapezius muscles between elevation and lowering of the arms with 10 healthy subjects. The EMGs of each muscle was quantified and normalized for the complete movement, as well as for the six different phases of each movement. Repeated measure ANOVAs were used to investigate main and interaction effects between movements/sides and sides/phases (alpha<0.05). Significant differences were found between the elevation and the lowering of the arms for all muscles (p