Which shoulder muscles help lift and lower your arm?
Moment arms of the muscles crossing the anatomical shoulder
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
The superior pectoralis major has a substantial capacity to generate flexion torque — meaning it helps lift the arm forward — which is not commonly emphasized in fitness or rehab settings.
Most people associate the pectoralis major with pushing or horizontal adduction (like a chest fly), not forward arm elevation. This challenges the simplified view of chest muscle function.
Practical Takeaways
When rehabbing a shoulder injury, consider that damage to a specific muscle sub-region (e.g., middle deltoid) may impair abduction more than other movements, guiding targeted therapy.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
The superior pectoralis major has a substantial capacity to generate flexion torque — meaning it helps lift the arm forward — which is not commonly emphasized in fitness or rehab settings.
Most people associate the pectoralis major with pushing or horizontal adduction (like a chest fly), not forward arm elevation. This challenges the simplified view of chest muscle function.
Practical Takeaways
When rehabbing a shoulder injury, consider that damage to a specific muscle sub-region (e.g., middle deltoid) may impair abduction more than other movements, guiding targeted therapy.
Publication
Journal
Journal of Anatomy
Year
2008
Authors
D. Ackland, P. Pak, M. Richardson, M. Pandy
Related Content
Claims (4)
When you lift your arm out in front of you, certain shoulder muscles are better at helping the movement because of how they're positioned, while others are stronger at pulling the arm back down.
In dead bodies, the front and middle parts of the shoulder muscle are best at lifting the arm out to the side, while certain chest and back muscles are better at pulling the arm back down because of how they're positioned.
Different parts of big shoulder muscles actually work in their own unique ways because they pull with different strength and direction — kind of like how different sections of a fan blade might push air differently.
The top part of your chest muscle is really good at helping your arm move forward, while the middle part keeps your shoulder steady and the bottom part helps pull your arm backward — based on how these parts are shaped in dead bodies studied by scientists.