Linking the lower arm to the upper arm, the brachioradialis muscle is a muscle of the upper outer area of the forearm muscle group, composing the main bulk of the top side of the upper forearm.
Recruited strongly during a palms down grip, the brachioradialis is an elbow flexor which shares many characteristics to that of the biceps brachii, and is more active during a palms down grip due to the biceps being in a mechanical disadvantage position.
Directly stimulating the brachioradialis can be achieved during an arm session, using hammer and over head grips on arm curling exercises. The brachioradialis will also be involved in many back exercises where an over hand grip is being used, commonly during barbell and dumbbell rows.
When training for muscular size it is often best to train in a rep range of 6-12 repetitions, although there is often much debate on the optimal rep range. It would be advisable to experiment with different ranges to see which suits you.
Brachioradialis courtesy of Fitness Uncovered - Bodybuilding & Fitness
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