What is the role of the supraspinatus in shoulder movement?

The supraspinatus is one of the four rotator cuff muscles and plays a crucial role in shoulder movement, particularly in the initial phase of abduction. It is primarily responsible for the first 15 degrees of shoulder abduction, which is the movement of lifting the arm away from the body. During this initial phase, the supraspinatus helps stabilize the head of the humerus in the glenoid cavity of the scapula, allowing for smooth and coordinated movement.

Once the arm is raised about 15 degrees, other muscles, particularly the deltoid, take over to continue the movement of abduction. The specific action of the supraspinatus is essential as it helps ensure proper mechanics of the shoulder joint, preventing impingement and contributing to overall shoulder stability. Understanding this role is vital for personal trainers and fitness professionals who work with clients on upper body strength and mobility exercises.