The term “active shoulder” has been used to describe what happens when the muscles of the shoulder girdle are used to support weight overhead in a way that protects the joint from impingement and places the load in balance over the scapulas. It involves the active contraction of the trapezius muscles, in recognition of the fact that the scapulas articulate with and therefore support the arms in the overhead lockout position, and that the traps thus ultimately hold up the weight of the bar if it is in balance directly over the glenoid fossa, the “socket” of the ball-and-socket joint of the shoulder. The active concentric contraction of the traps at the top of the scapula combined with the tension at the bottom of the scapula from the serratus anterior combine to tilt the top of the bone in the medial direction, away from the humerus in its position of lockout overhead, thus preventing any possible impingement of the soft tissue between the acromion process and the humerus. In effect, the triceps and deltoids bring the arm bones into alignment and hold them that way, but the traps hold the load up overhead by holding up the scapulas, the bones over which the bar is balanced and supported.There are many ways to cause injury to the shoulder, but the great majority of anecdotes I've heard from people who perform this exercise regularly and correctly is that it it's more likely to ameliorate shoulder instabilities and rotator cuff issues than cause them. Personally I've yet to have any shoulder issues despite pressing overhead once or twice a week every week for the past 2.5 years, with loads up to 200 pounds.
It seems logical, but we all know how tough it is to resist the exercises we've grown to love. Face the facts; you just might not be able to overhead press or bench with the straight bar.So for most people, most of the time, the Overhead Press should be regular part of their weight training routing.
Not all bodies are created equal in the first place; a good example would be the different types of acromions, a portion of the scapula. Those with type III acromions are more likely to suffer from subacromial impingement due to the shape of this end of the scapula
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posted by el chupa nibre at 9:01 AM on January 16, 2011