Movement Disorders, Other Instability of Joint, Shoulder Region, Strain of Shoulder Muscle (Disorder)
Conditions
Keywords
scapula dyskinesia, muscle stiffness, scapulohumeral rhythm, electromyography
Brief summary
The movement control of shoulder joint relies not only on the glenohumeral joint, but also the critical contributions from scapulothoracic joint. The relating scapula muscle strength, scapula mobility and, the most important of all, the capacity of neuromuscular control should be integrated into the rehabilitation program for patients with shoulder disorders. With regarding to the subacromial impingement syndrome or rotator tendinopathy, the status of scapula dyskinesia and dysfunctions were improved significantly after the intervention of scapula-emphasized exercise. But there was no study addressed the relationships between stiffness of relating muscles and the deficits of scapula movement. The stiffness had been shown to serve an important role in functional performance of the corresponding joint. For example, the decreased elasticity of supraspinatus muscle was noticed on affected side comparing in patients with impingement syndrome.Few studies examined the effects of altered muscle stiffness on kinematic performance in shoulder complex. Laudner et al. found that the stiffer the latismuss dorsi muscle was, the less upward rotation and posterior tilting, and the more internal rotation of scapula during arm elevation was exhibited in asymptomatic swimmers. Another study showed that the increased range of external rotation and posterior tilt of scapula during arm elevation were associated with the decreased stiffness of pectoralis minor. The recent study presented that the electromyographic activities and elasticities of middle deltoid, supraspinatus, and infraspinatus muscles correlated significantly with the tissue elasticity during shoulder movement in healthy shoulder. However, there was no scientific information directly to prove the changes in characteristics of rotator cuff function as well as the impacts on kinematic control of shoulder complex. Therefore, the aim of this study is to examine the relationship among characteristics of muscle properties and kinematic control healthy swimmers.
Interventions
None listed
Sponsors
Tzu Chi University
Study design
Observational model
CASE_CONTROL
Time perspective
CROSS_SECTIONAL
Eligibility
Sex/Gender
ALL
Age
13 Years to 22 Years
Healthy volunteers
Yes
Inclusion criteria
* freestyle swimmers with health shoulders
Exclusion criteria
* the past or current shoulder pain or disorders are examined by history taking and screening tests: shoulder impingement syndrome, instability, bony deformity, trauma, nerve injury or entrapment.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| scapulohumeral kinematics | through study completion, an average 11 months | the three-dimensional movements of humerus-to-trunk and scapula-to-trunk motions (degree) measured by the electromagnetic motion capture system |
| muscle activities | through study completion, an average 11 months | muscle activitiy of upper trapezius, middle deltoid, serratus anterior, infraspinatus, lower trapezius recorded by the surface electromyography |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| muscle strength | through study completion, an average 11 months | maximum muscle strength of upper trapezius, middle deltoid, serratus anterior, lower trapezius, internal and external rotators recorded by the hand-held dynamometer |
| muscle stiffness | through study completion, an average 11 months | muscle stiffness of upper trapezius, middle deltoid, serratus anterior, infraspinatus, lower trapezius recorded by the tissue-hardness measurement device |
Countries
Taiwan
Contacts
Primary ContactPo-Tsun Chen
Outcome results
None listed