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Unstable weights may change how athletes with shoulder pain move

NCT ID NCT07646899

Knowledge-focused Sponsor: National Yang Ming Chiao Tung University Source: ClinicalTrials.gov ↗

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Recruitment status, easiest to join first

Recruiting now This study
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Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

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Expanded access (paused)
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Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

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Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study looks at how using unstable loads (like a wobbly barbell) during shoulder presses affects shoulder movement and muscle activity in overhead athletes (e.g., volleyball, tennis, baseball players) who have subacromial pain syndrome. Researchers compare stable vs unstable conditions and also compare athletes with pain to healthy athletes. The goal is to understand if unstable loads alter shoulder mechanics, which could inform future rehabilitation strategies.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

What this could lead to
If successful, this research could help design better rehabilitation exercises for athletes with shoulder pain.
What could go wrong
This is a small, early-stage observational study with only 27 participants, so findings may not apply to all athletes or settings.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Participants

About 27 people

The number the study aims to enrol. It can still change while the study runs.

Started

Sep 2024

Expected to finish

Jun 2026

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Who is studied

Participants were recruited from sports-related venues.

Ages

18 to 40 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

The inclusion criteria for both the experimental and control groups were as follows: (1) amateur or recreational overhead athletes aged 18-40 years (e.g., volleyball, tennis, baseball); (2) sport participation history of more than 3 years; (3) weekly overhead sport participation of more than 4 hours; (4) ability to meet the minimum loading requirements of the equipment for both stable and unstable conditions, defined as a 15-repetition maximum (15RM) for stable shoulder press of ≥10 kg and unstable shoulder press of ≥8 kg. The individual inclusion criteria for the experimental group were: (1) diagnosis of subacromial pain syndrome, defined as at least 3 positive findings out of 5 clinical tests (Painful Arc test, Neer impingement test, Empty Can test, Hawkins-Kennedy impingement test, and Resisted External Rotation test); (2) Visual Analogue Scale (VAS) score of ≤3 during shoulder press performance; (3) symptoms present on the dominant side. The individual inclusion criteria for the control group were: absence of shoulder pain within the past 6 months, including no pain at the glenohumeral joint, acromioclavicular joint, sternoclavicular joint, scapulothoracic joint, or cervical spine. The exclusion criteria were as follows: (1) history of surgical intervention for fracture or dislocation of the shoulder or elbow joint within the past 6 months; (2) direct trauma to the cervical spine or upper extremity within the past 1 month; (3) shoulder pain or neurological symptoms of cervical origin; (4) any condition preventing the completion of the experimental protocol; (5) bilateral shoulder pain.

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Conditions

The condition(s) this trial relates to.

shoulder impingement syndrome

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Subacromial pain syndrome

How to take part

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  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

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    Open the record ↗

  3. A doctor treating you

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Contacts and locations

Locations

  • National Yang Ming Chiao Tung University

    RECRUITING

    Taipei, Taiwan

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