Muscle activation patterns of the supraspinatus and deltoid muscle in abduction of the arm: Motion generator or GH (de)stabilizator?
Recruiting
- Conditions
- Observational study in healthy subjects, to learn more about patients with rotator cuff disease.
- Registration Number
- NL-OMON19914
- Lead Sponsor
- eiden University Medical Center
- Brief Summary
/A
- Detailed Description
Not available
Recruitment & Eligibility
- Status
- Recruiting
- Sex
- Not specified
- Target Recruitment
- 23
Inclusion Criteria
1. Age: between 18 and 60 y.o.;
2. No history of shoulder complaints;
Exclusion Criteria
1. No signed informed consent;
2. Pace-maker or other electronic implants.
Study & Design
- Study Type
- Observational non invasive
- Study Design
- Not specified
- Primary Outcome Measures
Name Time Method External force controlled Electromyography (EMG).<br /> <br>To measure activation of individual shoulder muscles (in particular: deltoids, supraspinate, infraspinate, pectoralis major, upper and lower trapezius, latissimus dorsi and teres major) and analyze for relative changes in activation of rotator cuff and deltoid muscles with increased arm moment loading. <br /><br>Conditions: Arm against an external force in 24 directions (humerus fixed in splint, constant exerted abduction force), 2 moment arms (~4 cm and ~29 cm from the glenohumeral joint). <br /><br>Outcome: Average filtered EMG value (rEMG), principal Action (PA), Activation Ratio (AR) and Max Voluntary Force (MVF), relative change in deltoid and supraspinate activation (rEMG) expressed in percentages.
- Secondary Outcome Measures
Name Time Method 3D-Motion tracking of the scapular position during arm force task with the humerus in a fixed position. To record 3D kinematics of the scapula with a motion tracking system for analyzing the eventual change in scapular position as a result from changes in muscle activations when altering moment loading (with a constant force). <br /><br>Conditions: Arm against an external force (humerus fixed in a splint, constant exerted force), 2 moment arms (~4 cm and ~29 cm from the glenohumeral joint). <br /><br>Outcome: 3D scapular positions (scapular posterior tilting, external rotation, and lateral rotation as described in literature) with altering moments and muscle activations.