Abstract Summary
This study aimed to evaluate the activation of the three regions within the infraspinatus muscle during isometric external rotation (ER) exertions while the arm was positioned in different elevation postures. Superior and middle region of the infraspinatus showed similar activations irrespective of the arm posture, while the inferior region had significantly higher activation when ER was performed at 90° of arm elevation in the flexion and scaption planes.
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