Flexor Carpi Ulnaris

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The flexor carpi ulnaris is located at the posterior of the forearm. Flexor carpi ulnaris means 'flexor of the wrist from the ulna.'

The flexor carpi ulnaris is responsible for flexion of the wrist.

Movements which involved flexion of the wrist will recruit the flexor carpi ulnaris, and these exercises can be viewed in the exercise section to the right.

Like most wrist flexor muscles the flexor carpi ulnaris has an abundance of the type i fibres. This is no surprise as the flexion of the wrist, and also 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 wrist curls are best performed in the higher rep ranges if hypertrophy of the wrist flexors is the goal.