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Adduction and Infraspinatus Activity in Shoulder Pain
Sponsor: Universidad de La Frontera
Summary
The goal of this randomized crossover trial is to determine whether different levels of shoulder adduction pressure during an external rotation exercise change shoulder muscle activity in adults with chronic shoulder pain and adults without shoulder pain. The main question is whether adding a small amount of shoulder adduction pressure increases activity of the infraspinatus muscle without increasing activity of the deltoid muscles. Researchers will compare three levels of adduction pressure (0, 5, and 10 mmHg) during the same external rotation exercise. Participants will perform the three exercise conditions in a randomly assigned order while researchers measure shoulder muscle activity using surface electromyography.
Official title: Isometric Shoulder Adduction During External Rotation Increases Infraspinatus Activity in Adults With and Without Chronic Shoulder Pain: A Randomized Crossover Trial
Key Details
Gender
All
Age Range
18 Years - Any
Study Type
INTERVENTIONAL
Enrollment
44
Start Date
2023-08-01
Completion Date
2024-08-01
Last Updated
2026-08-14
Healthy Volunteers
Yes
Conditions
Interventions
Shoulder External Rotation With 0 mmHg Adduction Pressure
Participants performed the shoulder external rotation exercise while maintaining 0 mmHg of isometric shoulder adduction pressure against a biofeedback wedge. The exercise was performed with the shoulder positioned at approximately 45 degrees of external rotation from 0 degrees of glenohumeral rotation.
Shoulder External Rotation With 5 mmHg Adduction Pressure
Participants performed the shoulder external rotation exercise while maintaining 5 mmHg of isometric shoulder adduction pressure against a biofeedback wedge. The exercise was performed with the shoulder positioned at approximately 45 degrees of external rotation from 0 degrees of glenohumeral rotation.
Shoulder External Rotation With 10 mmHg Adduction Pressure
Participants performed the shoulder external rotation exercise while maintaining 10 mmHg of isometric shoulder adduction pressure against a biofeedback wedge. The exercise was performed with the shoulder positioned at approximately 45 degrees of external rotation from 0 degrees of glenohumeral rotation.
Locations (1)
Universidad de La Frontera
Temuco, La Araucanía, Chile