Serratus Anterior or Pectoralis Minor: which muscle has the upper hand during protraction exercises?

The Serratus Anterior(SA) has a critical role in stabilizing the scapula against the thorax. Research has linked shoulder and neck disorders to impairments in the SA activation. Exercises that target the SA are included in the rehabilitation of shoulder or neck pain and mostly include a protraction component. The Pectoralis Minor(PM) functions as a synergist of the SA. From the literature it is unclear to what extent PM is activated during SA exercises.

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