How Sustained Contraction of Your Shoulder Muscles Can Lead to Neck Pain, Shoulder Pain and Thoracic Outlet Syndrome - Thoracic Outlet Syndrome

When you reach your arm and hand outside perpendicular for longer than a few minutes, you are engaging a sustained contraction of muscles that depress and compress the shoulder down into the thoracic outlet and tunnel. When you reach out your arm to manipulate an object in front of you, a series of muscle contractions occur that can cause a narrowing of the costoclavicular space and the subpectoral space. The lower trapezius and latissimus dorsi contract to pull the shoulder girdle down to stabilize and anchor the shoulder to the chest to provide a solid platform to counterbalance the weight

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