Subacromial Pain SyndromeNCT07646899
The Effect of Unstable Loads on Scapular Kinematics and Muscle Activation During Overhead Press in Overhead Athletes With Subacromial Pain Syndrome
An observational study of Subacromial Pain Syndrome, run by National Yang Ming Chiao Tung University at 1 site in Taiwan.
Trial summary
The research aims to compare the differences between stable and unstable load conditions during shoulder pressing in overhead athletes with SAPS and to compare the differences between SAPS and healthy athletes with stable and unstable load conditions. Read more about this study
- Who is it for?
- Ages 18 to 40 yearsHealthy volunteers can take part
- Conditions the study is for
- Subacromial Pain Syndrome
- What is being tested?
- stable load shoulder press and Unstable load shoulder press
- Type of treatment
- Lifestyle or therapy programme
- How many people
- 27 participants
- Where
- 1 siteTaiwan
- Study dates
- 26 Sep 2024to 30 Jun 2026
- Phase
- Observational
- Are there results?
- Not yet: the study is under way
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 40 years
- All sexes
- Healthy volunteers accepted
- Adult
Study population: Participants were recruited from sports-related venues.
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.
Trial locations and contacts
1 site in 1 country. Contact the study team or a site near you to ask about taking part.
Taiwan1 site, 1 recruiting
- Recruiting
National Yang Ming Chiao Tung University
Taipei
About this study
The research aims to compare the differences between stable and unstable load conditions during shoulder pressing in overhead athletes with SAPS and to compare the differences between SAPS and healthy athletes with stable and unstable load conditions.
- Conditions
- Subacromial Pain Syndrome
- Being tested
- stable load shoulder press, Unstable load shoulder press
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
stable load shoulder pressBehavioural
Participants performed a shoulder press using a barbell loaded at their individual 15-repetition maximum
Unstable load shoulder pressBehavioural
Participants performed a shoulder press using a unstable loaded at their individual 15-repetition maximum
| Study group | Role | What they receive |
|---|---|---|
| Control group | Not described Receives: Behavioral: stable load shoulder press; Behavioral: Unstable load shoulder press | |
| Experimental group | Not described Receives: Behavioral: stable load shoulder press; Behavioral: Unstable load shoulder press |
What is being measured
The primary outcome is the main question the study is designed to answer.
Scapular kinematics (degrees) during shoulder elevation measured by VIPER™ system
Scapular upward rotation, posterior tilt, and external rotation angles (in degrees) were recorded during shoulder press using the VIPER™ electromagnetic tracking system. Data were collected at 30°, 60°, 90°, and 120° of humeral elevation, and reported as mean values for each angle.
Measured: Immediately after the single session
Surface electromyography (TeleMyo2400T G2, Noraxon USA Inc., Scottsdale, AZ, USA)
Muscle activation of upper trapezius, lower trapezius, serratus anterior, anterior deltoid, biceps brachii, triceps brachii, rectus abdominis, erector spinae during shoulder press
Measured: Immediately after the single session
Barbell trajectory (measured with camera)
The trajectory was captured by attaching reflective markers to the end of the barbell and recording kinematic data at a sampling frequency of 60 Hz using a camera.
Measured: Immediately after the single session
Secondary outcomes (1)
Shoulder average pain intensity
Pain is measured with Visual Analogue scale (VAS) Score range from 0 to 10. Scoring of 0 represents no pain and scoring of 10 represents pain as bad as it could possibly be.
Measured: Immediately after the single session
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted15 Jun 2026
- Study start26 Sep 2024
- Primary completion30 Jun 2026 (estimated)
- Study completion30 Jun 2026 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Subacromial Pain SyndromeStudies of the same condition, open and under way.
- More trials run by National Yang Ming Chiao Tung UniversityThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Observational model
- Case only
- Time perspective
- Cross-sectional
- Enrolment
- 27 participants (estimated)
Sponsor and investigators
- Lead sponsor
- National Yang Ming Chiao Tung University
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07646899
- Sponsor's protocol ID
- NYCU113008AF
- Status last verified
- Jun 2025
- First submitted
- 9 Jun 2026
- Last updated
- 15 Jun 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- Undecided
Study at a glance
From the registry record, last updated by the sponsor on 15 Jun 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- The Effect of Unstable Loads on Scapular Kinematics and Muscle Activation During Overhead Press in Overhead Athletes With Subacromial Pain Syndrome
- ClinicalTrials.gov ID
- NCT07646899
- Acronym / sponsor ID
- NYCU113008AF
- Conditions
- Subacromial Pain Syndrome
- Study type
- Observational
- Recruitment status
- Recruiting
- Enrolment
- 27 participants (estimated)
- Lead sponsor
- National Yang Ming Chiao Tung UniversityUniversity, hospital or other
- Study start
- 26 Sep 2024 (actual)
- Primary completion
- 30 Jun 2026 (estimated)
- Study completion
- 30 Jun 2026 (estimated)
- First posted
- 15 Jun 2026 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The research aims to compare the differences between stable and unstable load conditions during shoulder pressing in overhead athletes with SAPS and to compare the differences between SAPS and healthy athletes with stable and unstable load conditions.
Study design
- Observational model
- Case only
- Time perspective
- Cross-sectional
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Control group | – | Behavioral: stable load shoulder press, Behavioral: Unstable load shoulder press |
| Experimental group | – | Behavioral: stable load shoulder press, Behavioral: Unstable load shoulder press |
Who may qualify
- Ages
- 18 to 40 years
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult
- Study population
- Participants were recruited from sports-related venues.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| stable load shoulder pressParticipants performed a shoulder press using a barbell loaded at their individual 15-repetition maximum | Behavioural | Control group, Experimental group |
| Unstable load shoulder pressParticipants performed a shoulder press using a unstable loaded at their individual 15-repetition maximum | Behavioural | Control group, Experimental group |
Primary outcome
Scapular kinematics (degrees) during shoulder elevation measured by VIPER™ system
Time frame: Immediately after the single session
Scapular upward rotation, posterior tilt, and external rotation angles (in degrees) were recorded during shoulder press using the VIPER™ electromagnetic tracking system. Data were collected at 30°, 60°, 90°, and 120° of humeral elevation, and reported as mean values for each angle.
Surface electromyography (TeleMyo2400T G2, Noraxon USA Inc., Scottsdale, AZ, USA)
Time frame: Immediately after the single session
Muscle activation of upper trapezius, lower trapezius, serratus anterior, anterior deltoid, biceps brachii, triceps brachii, rectus abdominis, erector spinae during shoulder press
Barbell trajectory (measured with camera)
Time frame: Immediately after the single session
The trajectory was captured by attaching reflective markers to the end of the barbell and recording kinematic data at a sampling frequency of 60 Hz using a camera.
1 secondary outcome
Shoulder average pain intensity
Time frame: Immediately after the single session
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 15 Jun 2026.
- Individual participant dataSharing planned: Undecided
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Subacromial Pain Syndrome, run by National Yang Ming Chiao Tung University at 1 site in Taiwan.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: looking for participants now, as of the sponsor's last update on 15 Jun 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Taiwan. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
Contact Yi Chung Tsai, Master ((886)972877917, sc969183@gmail.com), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Scapular kinematics (degrees) during shoulder elevation measured by VIPER™ system (time frame: Immediately after the single session). The study lists 3 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 15 Jun 2026; AzTrials last refreshed its copy on 7 Nov 2026.