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The specificity of fatiguing protocols affects scapular orientation: Implications for subacromial impingement
- Source :
- Clinical biomechanics (Bristol, Avon). 26(1)
- Publication Year :
- 2010
-
Abstract
- article i nfo Background: Shoulder impairments are often associated with altered scapular kinematics. As muscles control scapular movement, functionally altering muscle performance through fatigue may produce scapular kinematics that mimic those of injured patients. The aim of this study was to examine if changes in scapular tilt, rotation and pro/retraction following two different upper extremity fatiguing protocols have any implications with respect to subacromial impingement. Methods: Scapular orientation was monitored during posturally constrained static holds (at 0°, 45° and 90° of humeral elevation) before and after two fatiguing protocols, one global and one local. Both protocols are associated with producing changes in shoulder skeletal arrangement. Findings: Following the global fatiguing protocol, there was significantly more scapular posterior tilt (Pb0.01) and upward rotation (Pb0.02), particularly at 90° humeral elevation. No changes in scapular orientation occurred following the local fatiguing protocol. Interpretation: Scapular orientation changes following muscle fatigue acted to increase the subacromial space. Thus, the rotator cuff muscles, not the scapular stabilizers, have more influence on actively preventing mechanical subacromial impingement. The lack of evidence of reduction of the subacromial space thus implicates superior humeral head translation as a more likely primary mechanism of the initiation of subacromial impingement.
- Subjects :
- musculoskeletal diseases
Adult
Male
medicine.medical_specialty
medicine.medical_treatment
Musculoskeletal Physiological Phenomena
Posture
Biophysics
Motion
Physical medicine and rehabilitation
Orientation (mental)
Subacromial impingement
medicine
Humans
Orthopedics and Sports Medicine
Rotator cuff
Reduction (orthopedic surgery)
Fatigue
Muscle fatigue
business.industry
Electromyography
Muscles
musculoskeletal system
Biomechanical Phenomena
Scapula
medicine.anatomical_structure
Shoulder Impingement Syndrome
Scapular kinematics
Female
business
Acromion
Subjects
Details
- ISSN :
- 18791271
- Volume :
- 26
- Issue :
- 1
- Database :
- OpenAIRE
- Journal :
- Clinical biomechanics (Bristol, Avon)
- Accession number :
- edsair.doi.dedup.....7cb1449ad8c6879a3bdceb178edd5eef