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The immediate effects of a shoulder brace on muscle activity and scapular kinematics in subjects with shoulder impingement syndrome and rounded shoulder posture: A randomized crossover design
- Source :
- Gait & Posture. 79:162-169
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- Round shoulder posture (RSP) is one of the potential risks for shoulder impingement syndrome (SIS) due to alignment deviation of the scapula. Evidence on how the characteristics of a shoulder brace affecting the degree of RSP, shoulder kinematics, and associated muscle activity during movements is limited.The purposes of this study were (1) to compare the effects of a shoulder brace on clinical RSP measurements, muscle activities and scapular kinematics during arm movements in subjects with shoulder impingement syndrome (SIS) and RSP; and (2) to compare the effects of two configurations (parallel and diagonal) and two tensions (comfortable and forced tension) of the brace straps on muscle activities and scapular kinematics during arm movements in subjects with SIS and RSP.Twenty-four participants (12 males; 12 females) with SIS and RSP were randomly assigned into 2 groups (comfortable then forced, and forced then comfortable) with 2 strap configurations in each tension condition. The pectoralis minor index (PMI), acromial distance (AD) and shoulder angle (SA) were used to assess the degree of RSP. Three-dimensional electromagnetic motion analysis and electromyography were used to record the scapular kinematics and muscle activity during arm movements.All clinical measurements with the brace were significantly improved (p 0.05). Under forced tension, muscle activities were higher with the diagonal configuration than with the parallel configuration in the lower trapezius (LT) (1.2-2.3% MVIC, p 0.05) and serratus anterior (SA) (2.3% MVIC, p = 0.015). For upward rotation and posterior tilting of the scapula, the diagonal configuration was larger than the parallel configuration (1.5°, p = 0.038; 0.4°-0.5°, p 0.05, respectively).Different characteristics of the straps of the shoulder brace could alter muscle activity and scapular kinematics at different angles during arm movement. Based on the clinical treatment preference, the application of a shoulder brace with a diagonal configuration and forced tension is suggested for SIS and RSP subjects.
- Subjects :
- Adult
Male
musculoskeletal diseases
Shoulder
Posture
Biophysics
Electromyography
03 medical and health sciences
0302 clinical medicine
Scapula
Humans
Medicine
Orthopedics and Sports Medicine
Range of Motion, Articular
Muscle activity
Muscle, Skeletal
Orthodontics
Braces
Cross-Over Studies
medicine.diagnostic_test
business.industry
Rehabilitation
030229 sport sciences
musculoskeletal system
Crossover study
Brace
Biomechanical Phenomena
Shoulder Impingement Syndrome
Scapular kinematics
Pectoralis Minor
Female
business
human activities
030217 neurology & neurosurgery
Subjects
Details
- ISSN :
- 09666362
- Volume :
- 79
- Database :
- OpenAIRE
- Journal :
- Gait & Posture
- Accession number :
- edsair.doi.dedup.....403afe0d6fa6f885c91c1bd479962efb