Controversy About Action
A 1963 study, "Function of the Supraspinatus Muscle and its Relation to the Supraspinatus syndrome - An experimental in Man" by B Van Linge and J D Mulder in Leiden, Holland showed that the supraspinatus does not cause the abduction of the first 30 degrees, as widely accepted, but rather is a synergist muscle. This means that it assists the deltoid, but is not, by itself the abducting muscle. In this study, the supraspinatus was anaesthetised, and the deltoid muscle was still able to complete a full range of abduction, however was not able to sustain an isometric contraction for more than one minute. From this study, it is suggested that the "true" action of the supraspinatus is to hold the capsule in position to allow greater functional strength and stamina of the deltoid muscle.
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