Clinical trial NCT04176692: The Effects of Muscle Characteristics on the Control of Shoulder Complex During Functional Movements
Official title: The Movement Pattern of Shoulder Complex and the Intervention Effects of Therapeutic Exercise in Patients With Proximal Humerus Fracture
Study type: OBSERVATIONAL
Overall status: UNKNOWN
Conditions: Other Instability of Joint, Shoulder Region
Strain of Shoulder Muscle (Disorder)
Movement Disorders
Keywords: scapula dyskinesia
muscle stiffness
scapulohumeral rhythm
electromyography
Lead sponsor: Tzu Chi University
Sponsor class: OTHER
First posted: 2019-11-25
Enrollment: 20
Sex: ALL
Minimum age (years): 13
Maximum age (years): 22
Standard ages: CHILD
ADULT
Accepts healthy volunteers: yes
Observational model: CASE_CONTROL
Time perspective: CROSS_SECTIONAL
Sampling method: NON_PROBABILITY_SAMPLE
Study population: adolescent swimmers in junior or senior high school swimming team with regular training

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.


Eligibility criteria: 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.

Primary outcomes:
measure: scapulohumeral kinematics
timeFrame: through study completion, an average 11 months
measure: muscle activities
timeFrame: through study completion, an average 11 months
Secondary outcomes:
measure: muscle strength
timeFrame: through study completion, an average 11 months
measure: muscle stiffness
timeFrame: through study completion, an average 11 months
Other outcomes:
Locations:
city: Hualien City
country: Taiwan
facility: Tzu Chi University
state: 請選擇
Study officials:
affiliation: Tzu Chi University
name: Po-Tsun Chen
role: PRINCIPAL_INVESTIGATOR
References: