Extensor Carpi Ulnaris

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The extensor carpi ulnaris is located at the outer anterior of the forearm. Extensor carpi ulnaris means 'extensor of the wrist from the ulna'.

Movements which involve the extension of the wrist will recruit the extensor carpi ulnaris, and these exercises can be viewed in the exercise section to the right.

Like most wrist extensor muscles, the extensor carpi ulnaris has an abundance of the type i fibres. This is no surprise as the extension of the wrist, and flexion and adduction of the fingers are repeated continually in daily tasks.

Studies have shown that hypertrophy of the type i fibres are best during high rep ranges, anywhere from 25-50 reps per set, which provides optimal time under tension (TUT).
We could therefore conclude that isolation exercises such as overhand wrist curls are best performed in the higher rep ranges if hypertrophy of the wrist extensors is the goal.