NETA Personal Trainer Practice Exam

The supraspinatus is primarily responsible for assisting with shoulder abduction, especially during the first 30 degrees of movement. This muscle is one of the four rotator cuff muscles and plays a key role in stabilizing the shoulder joint. Its anatomical position allows it to initiate the lifting of the arm away from the body, which is essential for many functional movements. During the initial phase of shoulder abduction, the deltoid muscles take over as the arm moves beyond 30 degrees. However, without the action of the supraspinatus to begin this movement, the deltoids would be less effective in their role. Therefore, understanding the specific contribution of the supraspinatus to shoulder abduction is crucial for personal trainers and fitness professionals when designing exercise programs or rehabilitative strategies. The other functions listed, such as shoulder internal and external rotation or shoulder flexion, involve different muscle groups and do not pertain specifically to the primary action of the supraspinatus.