Lower Fibres of the Trapezius

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The trapezius gets its name from its irregular 4 sided shape, which looks like a trapezium.

The lower fibres of the trapezius are recruited strongly during scapular depression, in other words, pulling the shoulder blades downwards.
The lower trapezius region will get stimulated from most general back exercises, which can be viewed in by following the link in the exercise section to the right.

Worrying about this specific area isn’t greatly necessary, as a well structured routine will recruit and stimulate the lower trapezius fibres effectively.

Hypertrophy will be optimal during 6-12 reps for the trapezius, providing ideal time under tension for the muscle fibre make up of the muscle tissue.
If however strength and power is the primary goal then the trapezius will likely be best stimulated within the 1-5 rep ranges, providing stimulation for the type iiB fibres and neural adaptations of the nervous system.