Weakening, inflammation, or tears to the tendons or muscles of the shoulder will impair shoulder abduction.Įmployees engaged in tasks that require frequent shoulder abduction should be encouraged to perform exercises that strengthen the shoulder muscles and allowed sufficient recovery breaks to prevent the occurrence of injuries. The glenohumeral joint connecting the scapula to the humerus is the point of articulation for shoulder abduction.Ī healthy shoulder allows for a 150-degree range of motion during shoulder abduction this range of motion will be significantly reduced if the primary musculoskeletal support of the shoulder, the rotator cuff, is damaged. The pectoralis major acts as an antagonist to the middle deltoid anteriorly. Shoulder abduction is a movement of the arm away from the body and should not be confused with shoulder adduction, which involves movement toward the center of the body.ĭuring shoulder abduction, the middle deltoid and supraspinatus muscles of the shoulder operate to lift the arm away from the side of the body. The middle region of the deltoid muscle is the prime mover for arm abduction. The common statement that supraspinatus initiates abduction is therefore, misleading.WorkplaceTesting Explains Shoulder Abduction These muscles produce a large spectrum of arm movements which include internal and external arm rotation, arm abduction and arm adduction. Shoulder Abduction: Muscle Motion, Kinesiology & Anatomy Muscle and Motion 366K subscribers Subscribe 611 172K views 8 years ago Anatomy The muscle motion, kinesiology and anatomy of. 2 History Dr John Bakody, a neurosurgeon developed this technique in 1977 and published the same in the Surgical Neurology 3. Acting together, the rotator cuff muscles stabilize the shoulder joint. This test can be suggestive of cervical 1 nerve involvement, but however isn't diagnostic of it. Conclusions: Supraspinatus is recruited prior to movement of the humerus into abduction but not earlier than many other shoulder muscles, including infraspinatus, deltoid and axioscapular muscles. It is otherwise known as the shoulder abduction test. The effects of load or plane of movement were not significant. Extend your arm out to a 'T.' Bend your elbow so your forearm in. Shoulder adduction: Lie on your back on a firm surface. Slowly raise your arm to the side with your thumb pointing up. How do I exercise with a weight Shoulder abduction: Stand and hold a weight in your hand with your palm facing your body. Subscapularis was activated significantly later than supraspinatus, infraspinatus, deltoid and upper trapezius, while supraspinatus, infraspinatus, upper trapezius, lower trapezius, serratus anterior and deltoid all had similar initial activation times. Shoulder abduction: Stand and hold a weight in your hand with your palm facing your body. Results: All muscles tested were activated prior to movement onset. Initial activation timing of a muscle was determined as the time at which the average activation (over a 25 ms moving window) was greater than three standard deviations above baseline measures. Methods: Electromyographic recordings were taken from seven shoulder muscles of fourteen volunteers during shoulder abduction in the coronal and scapular planes and a plane 30° anterior to the scapular plane, at 25%, 50% and 75% of maximum load. isokinetic shoulder abduction/adduction (ISOAB/ISOAD) and hand-held dynamometer (HHD) shoulder abduction. Therefore, the aims of the present study were to determine whether supraspinatus initiates shoulder abduction by activating prior to movement and significantly earlier than other shoulder muscles and to determine if load or plane of movement influenced the recruitment timing of supraspinatus. For this exercise, you can mirror a similar position as the stretch for your internal rotators (exercise 1 from the mobility section). Shoulder abduction - standing with dumbbells (Shoulder abduction overhead (bilateral) strengthening free weight, in standing 01) exercise video (high. Purpose: It is commonly stated that supraspinatus initiates abduction however, there is no direct evidence to support this claim. Abduction is the particular mechanic that allows you to move your arm away from the body, like when you’re lifting your arms up into a rep of jumping jacks. This unique anatomy allows a wide range of normal shoulder range of motion (ROM), including abduction, flexion, extension, lateral rotation and medial rotation. Reed, Darren, Cathers, Ian, Halaki, Mark and Ginn, Karen A unique joint, the shoulder has only one bony attachment to the rest of the skeleton between the collarbone and the breastbone.
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