![]() ![]() A prone grip will rely more greatly on the other flexors, the brachialis and brachioradialis. Ī supinated grip at the forearm allows the biceps to contribute more strongly as an elbow flexor. This is because, while the biceps shortens as the elbow flexes, it will also lengthen as the shoulder extends. As the biceps originate on the scapula unlike the other two which originate on the humerus, the biceps are inclined to serve a role as a dynamic stabilizer, much as the hamstrings would during a squat. Muscles which flex the elbow joint such as the biceps brachii muscle, brachialis muscles and brachioradialis muscle are active to improve leverage. Muscles which attach to the scapulae that adduct and extend the arm include the posterior deltoid muscles, the teres major, and minor stabilizing contribution from some rotator cuff muscles ( infraspinatus and teres minor as lateral rotators, subscapularis as medial rotators). The pec minor also works in conjunction with the rhomboid muscle and levator scapulae to perform downward rotation of the scapulae. Muscles that attach to and depress the scapulae include the lower trapezius muscle and the pectoralis minor. ![]() ![]() If the weight were being pulled solely by the lats, for example, the scapulae would simply be pulled down by gravity, along for the ride. The contraction of these adductor/extensor muscles can indirectly depress and downwardly rotate the scapulae this is only required when they are pulled into elevation and upward rotation by the contraction of muscles that attach to the scapulae. The lower sternal fibers of the pectoralis major also perform this role of extension and adduction to a lesser degree. It bypasses the scapulae unlike other muscles which perform this function, so work performed by this muscle will not contribute to muscles that affect the scapulae. The latissimus dorsi performs extension and adduction of the arm directly to the spinal fascia. These are the elbow in conjunction with the glenohumeral and scapulothoracic joints in the shoulder girdle. The standard pull-down motion is a compound movement that requires dynamic work by muscles surrounding the three joints which move during the exercise. The cable lat pull-down is done where the handle is moved via a cable pulley, as opposed to doing pull-downs on a leverage machine. It performs the functions of downward rotation and depression of the scapulae combined with adduction and extension of the shoulder joint. The pull-down exercise is a strength training exercise designed to develop the latissimus dorsi muscle. Cable pull-down exercise to the front with a medium-width overhand (pronated) grip ![]()
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