Trunk rotation and scapular muscle activity and kinematics

How does ipsilateral trunk rotation affect scapular muscle activity and kinematics during shoulder exercises?

Recent studies have shown that exercises loading the kinetic chain (by extending the trunk and hip) facilitate activity in the scapular muscles. This study investigated whether ipsilateral trunk rotation elicited similar effects. It was found that scapular external rotation and posterior tilt increased, that lower trapezius activation increased and upper trapezius activation decreased in the presence of ipsilateral trunk rotation.

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