The Effect of Unstable Loads on Scapular Kinematics and Muscle Activation During Overhead Press in Overhead Athletes With Subacromial Pain Syndrome
For patients and families
In plain language
An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.
- What is being studied
- The protocol lists: stable load shoulder press, Unstable load shoulder press.
- Who it may be relevant to
- Registry conditions: Subacromial Pain Syndrome. Basic parameters: 18 years — 40 years · All.
- What needs checking
- Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
- Where it takes place
- Taiwan
- Next step
- Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →
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Overview
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.
Interventions
- Behavioral stable load shoulder press
Participants performed a shoulder press using a barbell loaded at their individual 15-repetition maximum - Behavioral Unstable load shoulder press
Participants performed a shoulder press using a unstable loaded at their individual 15-repetition maximum
Primary outcome measures
- Scapular kinematics (degrees) during shoulder elevation measured by VIPER™ system [Time frame: Immediately after the single session]
- Surface electromyography (TeleMyo2400T G2, Noraxon USA Inc., Scottsdale, AZ, USA) [Time frame: Immediately after the single session]
- Barbell trajectory (measured with camera) [Time frame: Immediately after the single session]
Secondary outcome measures (1)
- Shoulder average pain intensity [Time frame: Immediately after the single session]
Eligibility criteria
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.
Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.
Healthy volunteers: Yes
Study design
- Observational model
- Case-only
Study locations
Taiwan · 1 center
- National Yang Ming Chiao Tung University — Taipei
Identifiers
NCT: NCT07646899 · NYCU113008AF