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Shoulder shrug exercises can help to strengthen neck and shoulder muscles which in results help to reduce neck pain. The core muscle that gets activated during shoulder shrugs are trapezius. [ 7 ]
An example of trapezius function is an overhead press. When activating together, the upper and lower fibers also assist the middle fibers (along with other muscles such as the rhomboids) with scapular retraction/adduction. The trapezius also assists in abduction of the shoulder above 90 degrees by rotating the glenoid upward.
The muscle which can 'cancel' or to some degree reverse the action of the muscle. Muscle synergies are noted in parentheses when relevant. O (Occurrences) Number of times that the named muscle row occurs in a standard human body. Here it may also be denoted when a given muscles only occurs in a male or a female body.
The accessory nerve is tested by evaluating the function of the trapezius and sternocleidomastoid muscles. [8] The trapezius muscle is tested by asking the patient to shrug their shoulders with and without resistance. The sternocleidomastoid muscle is tested by asking the patient to turn their head to the left or right against resistance. [8]
Trapezius muscle; elevation of the ribs. Pectoralis minor muscle; Scalene muscles; mandible. Medial pterygoid muscle; upper lip. Levator labii superioris; upper lip and wing of nose. Levator labii superioris alaeque nasi muscle; angle of mouth. Levator anguli oris; upper eyelid. Levator palpebrae superioris muscle; eyeball. Superior rectus muscle
Muscle strength deficits in the lower trapezius muscles are also a common clinical finding in patients with rounded shoulders as it has been speculated to restrict zygapophyseal extension in the middle to lower thoracic spine. [36] Therefore, RSP treatment often targets the symptoms or root causes associated with these problem areas.
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The narrower the grip the more the trapezius muscles are exercised, as opposed to the deltoids. Barbells , dumbbells , kettlebells or a cable machine can be used. Due to the amount of internal rotation of the humerus during this movement, this exercise may worsen shoulder impingement syndrome.