Adduction and Infraspinatus Activity in Shoulder Pain
CompletedNot applicableNCT07765056
View the official record on ClinicalTrials.gov Recruiting status changes often. Contact the study team listed on ClinicalTrials.gov, and talk to your doctor before joining a study.
This study has no listed site in Canada in this snapshot. It is included as part of the worldwide chronic pain corpus.
Brief summary (from the registry)
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.
Study details
- Official title
- Isometric Shoulder Adduction During External Rotation Increases Infraspinatus Activity in Adults With and Without Chronic Shoulder Pain: A Randomized Crossover Trial
- Conditions
- Interventions
- Behavioral: Shoulder External Rotation With 0 mmHg Adduction Pressure
- Behavioral: Shoulder External Rotation With 5 mmHg Adduction Pressure
- Behavioral: Shoulder External Rotation With 10 mmHg Adduction Pressure
- Sponsor
- Universidad de La Frontera
- Start date
- 2023-08-01
- Primary completion
- 2024-08-01
- Sex
- All
- Age range
- from 18 Years
- Healthy volunteers
- true
- Results posted
- No results posted in this snapshot
- Countries
- Chile
- Total sites listed
- 1
Eligibility criteria
Show eligibility criteria (verbatim from the registry)
Inclusion Criteria: Shoulder Pain Group (SPG): * Adults aged 18 years or older. * Medical diagnosis of chronic non-traumatic shoulder pain lasting more than 3 months. * Resting pain intensity of at least 2 cm on a visual analogue scale (VAS). * Ability to perform at least 130° of shoulder flexion, 90° of shoulder abduction, and 45° of shoulder external rotation. Pain-Free Group (PFG): * Adults aged 18 years or older. * No current shoulder or neck symptoms. * No shoulder or neck symptoms during the previous 2 years. * No previous medical consultation for shoulder or neck discomfort. * Full shoulder abduction and external rotation range of motion. * Ability to perform pain-free maximal isometric contractions during shoulder abduction and external rotation. Exclusion Criteria: Shoulder Pain Group (SPG): * History of neck or upper limb surgery. * History of glenohumeral instability or upper limb fracture. * Neck pain or pain in another segment of the upper limb. * Systemic diseases that could influence shoulder movement or muscle activation, including rheumatoid arthritis or neuromuscular diseases. * Physical therapy treatment during the previous year for pain in the affected upper limb.
Source: ClinicalTrials.gov (US National Library of Medicine), snapshot October 2026. Check the registry for current recruiting status. Record: https://clinicaltrials.gov/study/NCT07765056