Uploaded March 2026 | Updated September 2026, 2 weeks ago
A study by Kurokawa et al. (2014) revealed how muscle engagement changes with arm position during shoulder external rotation.
🔹 At 0° abduction: The infraspinatus does most of the work, powering the movement when your arm stays close to your body.
🔹 At 90° abduction: The teres minor takes over, showing peak activation when your arm is raised to the side. 💪
Understanding these differences helps you train smarter, enhance shoulder stability, and boost performance.
📲 Want to master shoulder training and understand every movement in 3D?
Download the Muscle & Motion Strength Training App and take your workouts to the next level!
Link in bio!🔗
A study by Kurokawa et al. (2014) revealed how muscle engagement changes with arm position during shoulder external rotation.
🔹 At 0° abduction: The infraspinatus does most of the work, powering the movement when your arm stays close to your body.
🔹 At 90° abduction: The teres minor takes over, showing peak activation when your arm is raised to the side. 💪
Understanding these differences helps you train smarter, enhance shoulder stability, and boost performance.
📲 Want to master shoulder training and understand every movement in 3D?
Download the Muscle & Motion Strength Training App and take your workouts to the next level!
Link in bio!🔗
