The Effects of Muscle Characteristics on the Control of Shoulder Complex During Functional Movements

The Movement Pattern of Shoulder Complex and the Intervention Effects of Therapeutic Exercise in Patients With Proximal Humerus Fracture

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.

Study Overview

• Status: Unknown
• Conditions: Movement Disorders; Other Instability of Joint, Shoulder Region; Strain of Shoulder Muscle (Disorder)

• Study Type: Observational
• Enrollment (Anticipated): 20

Contacts and Locations

Study Locations

• Taiwan
  • 請選擇
    • Hualien City, 請選擇, Taiwan, 970
      • Recruiting
      • Tzu Chi University
      • Contact: Po-Tsun Chen; Phone Number: 2493 886-3-856-5301; Email: ptchen120@mail.tcu.edu.tw

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 13 years to 22 years (Child, Adult)
• Accepts Healthy Volunteers: Yes
• Genders Eligible for Study: All

• Sampling Method: Non-Probability Sample

Study Population

adolescent swimmers in junior or senior high school swimming team with regular training

Description

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.

Study Plan

How is the study designed?

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
scapulohumeral kinematics	the three-dimensional movements of humerus-to-trunk and scapula-to-trunk motions (degree) measured by the electromagnetic motion capture system	through study completion, an average 11 months
muscle activities	muscle activitiy of upper trapezius, middle deltoid, serratus anterior, infraspinatus, lower trapezius recorded by the surface electromyography	through study completion, an average 11 months

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
muscle strength	maximum muscle strength of upper trapezius, middle deltoid, serratus anterior, lower trapezius, internal and external rotators recorded by the hand-held dynamometer	through study completion, an average 11 months
muscle stiffness	muscle stiffness of upper trapezius, middle deltoid, serratus anterior, infraspinatus, lower trapezius recorded by the tissue-hardness measurement device	through study completion, an average 11 months

Collaborators and Investigators

• Sponsor: Tzu Chi University
• Investigators: Principal Investigator: Po-Tsun Chen, Tzu Chi University

Study record dates

Study Major Dates

• Study Start (Actual): September 1, 2019
• Primary Completion (Anticipated): August 1, 2020
• Study Completion (Anticipated): August 1, 2020

Study Registration Dates

• First Submitted: November 16, 2019
• First Submitted That Met QC Criteria: November 21, 2019
• First Posted (Actual): November 25, 2019

Study Record Updates

• Last Update Posted (Actual): November 25, 2019
• Last Update Submitted That Met QC Criteria: November 21, 2019
• Last Verified: November 1, 2019

More Information

Terms related to this study

• Keywords: electromyography; muscle stiffness; scapula dyskinesia; scapulohumeral rhythm
• Additional Relevant MeSH Terms: Pathologic Processes; Central Nervous System Diseases; Nervous System Diseases; Joint Diseases; Musculoskeletal Diseases; Disease; Movement Disorders; Joint Instability
• Other Study ID Numbers: MOST108-2314-B-320 -001-

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No