CompletedNot Applicable

Adduction and Infraspinatus Activity in Shoulder Pain

Chile44 participantsStarted 2023-08-01

Plain-language 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.

Who can participate

Age range

18 Years

Sex

ALL

See this in plain English?

AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.

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.

Questions worth asking your doctor

Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.

1Based on my diagnosis and history, is this trial worth exploring for me — or is there a standard treatment we should try first?
2What does this trial's phase tell us about how much is already known about its safety and benefit?
3What would taking part actually involve for me — visits, tests, time, and travel?
4What are the known and possible risks or side effects I should weigh, and how would they be monitored?
5If this trial isn't the right fit, what other options or trials would you suggest I look into?

Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.

Questions for the trial coordinator

The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.

1What does taking part actually involve week to week — how many visits, where, and how long does each one take?
2What costs are covered by the study, and what might I have to pay for myself, including travel, parking, or time off work?
3What happens during screening, and what happens if the study team confirms I don't meet the criteria after those tests?
4Who pays for the scans, blood work, and other tests the trial requires — the study, my insurance, or me?
5How will being in the trial affect my regular care, and will my own doctor stay informed and involved?
6Can I leave the trial at any point if I change my mind, and what would happen to my care if I do?

A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.

What they're measuring

Peak Surface Electromyographic Activity of Shoulder Muscles

Timeframe: Day 1. During each experimental condition (0, 5, and 10 mmHg)

Trial details

NCT IDNCT07765056

SponsorUniversidad de La Frontera

Sponsor typeOTHER

Study typeINTERVENTIONAL

Primary completion2024-08-01

View on ClinicalTrials.gov More Chronic Shoulder Pain trials