Submitted by Mikos on September 23, 2007

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Sports Movements

Sporting Activity - Dumbbell Curl

A concentric action occurs when a muscle acts forcibly enough to actually shorten (In this case the Bicep). This shortening pulls the bones of attachment closer to each other, causing movement at the joint. Diagram A illustrates elbow flexion against gravity as a result of a concentric action. The muscles responsible for the flexion are able to act with sufficient force to shorten, which pulls the lower arm toward the humerus. Although the pull is on all the bones of attachment, usually only the bone farthest from the trunk (e.g. a limb) will move in a concentric action. The type of joint present is the hinge joint (Of the elbow) (a joint...

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