The empty-can exercise may be a good exercise to recruit the middle deltoid muscle, and the prone full-can exercise may be a good exercise to recruit the posterior deltoid muscle.ĭynamic stabilization empty-can exercises full-can exercises prone full-can exercises rotator cuff scaption shoulder. While all 3 exercises produced similar amounts of supraspinatus activity, the full-can exercise produced significantly less activity of the deltoid muscles and may be the optimal position to recruit the supraspinatus muscle for rehabilitation and testing. Diagnosis is clinical with point tenderness over the quadrilateral space and possible presence of teres minor atrophy.

005) exercises and significantly greater activity during the empty-can exercise (54 +/- 24% MVIC) than during the full-can exercise (38 +/- 32% MVIC) (P =. Quadilateral space syndrome is a rare source of posterolateral shoulder pain caused by the compression of the axillary nerve and posterior humeral circumflex artery in the quadrilateral space. The posterior deltoid showed significantly greater activity during the prone full-can exercise (87 +/- 53% MVIC) than during the full-can (P =. The middle deltoid showed significantly greater activity during the empty-can exercise (77 +/- 44% MVIC) and prone full-can exercise (63 +/- 31% MVIC) than during the full-can exercise (52 +/- 27% MVIC) (P =. No statistical difference existed among the exercises for the supraspinatus. 05) and post hoc 2-tailed, paired t tests to detect significant differences in muscle activity among exercises. We calculated 1-way repeated-measures analysis of variance (P <. The EMG data were collected at 960 Hz for analysis during maximal voluntary isometric contraction (MVIC) and 5 repetitions of 3 exercises: standing elevation in the scapular plane ('full can'), standing elevation in the scapular plane with glenohumeral internal rotation ('empty can'), and prone horizontal abduction at 100 degrees with glenohumeral external rotation ('prone full can'). Fine-wire EMG electrodes were inserted into the supraspinatus, middle deltoid, and posterior deltoid muscles. Twenty-two asymptomatic subjects (15 men, 7 women) with no history of shoulder injury participated. To quantify EMG activity of the supraspinatus, middle deltoid, and posterior deltoid muscles during exercises commonly used in rehabilitation. Investigators have observed electromyographic (EMG) activity of the supraspinatus muscle and reported conflicting results.

Emg test for shoulder pain