Shoulder
Exercise
Sports Health. Sep/Oct 2020;12(5):495-500. Tsuruike M, Ellenbecker TS, Lauffenburger C.
Background: Traditional exercises performed with the shoulder in the position of 90° abduction and external rotation with elbow flexion (90/90) while using a single elastic band showed moderate activity of both the lower trapezius (LT) and infraspinatus (IS) muscle.
Purpose: The purpose of this study was to investigate activity of the teres minor (TMi) and the LT muscles during standing external rotation exercise with the shoulder in the 90/90 position with 2 elastic bands in both the frontal and the scapular plane.
Conclusion: The standing 90/90 arm position with double elastic band exercise increased both TMi and LT muscular activation in the frontal plane compared with the scapular plane. This study also identified significant increases in muscle activation using OSC as compared with ISO exercise or 20% MR. The results of this study have clinical implications regarding the careful selection of exercise intensity and arm position when using elastic resistance exercise for the shoulder.