The middle trapezius is stretched with protraction of the scapula at the scapulocostal (scapulothoracic) joint.
Note: Medial rotation of the arm at the shoulder (glenohumeral ) joint can, via scapulohumeral rhythm, create increased scapular protraction, thereby increasing the efficacy of the stretch.
![The middle trapezius is stretched with protraction of the scapula at the scapulocostal (scapulothoracic) joint.](https://learnmuscles.com/wp-content/uploads/2017/10/Middle-trapezius-stretch-1024x891.jpg)
The middle trapezius is stretched with protraction of the scapula at the scapulocostal (scapulothoracic) joint.