期刊
JOURNAL OF ELECTROMYOGRAPHY AND KINESIOLOGY
卷 23, 期 6, 页码 1356-1361出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jelekin.2013.08.007
关键词
Subacromial impingement; Shoulder; Fatigue; Scapulothoracic muscles; Scapular orientation
资金
- Canadian Natural Sciences and Engineering Research Council
While fatigue of the rotator cuff demonstrably causes superior humeral head migration and concomitant risk of impingement, the relationship between specific muscular fatigue, scapular dyskinesis and impingement risk is less clear. The purpose of this study was to examine changes in scapular orientation following a simulated prone rowing fatiguing protocol that targeted the scapula stabilizing muscles while attempting to alleviate rotator cuff muscular demands. Scapular orientation and muscle activity were collected from participants before and immediately after the fatiguing task. This task fatigued both the stabilizing (upper and middle trapezius, and latissimus dorsi) and rotator cuff (supraspinatus, and infraspinatus) muscles. The upper extremity muscle fatigue pattern caused by the protocol did not elicit any significantly changes in three-dimensional scapular position with all post-fatigue changes being <= 1 degrees(p = 0.17-0.58). These results indicated that scapular reorientation is likely not the dominant mechanism of fatigue-induced subacromial impingement development. However, the substantial variability present in the kinematics prevents complete exclusion of scapular dyskinesis as a secondary causal mechanism of impingement. (C) 2013 Elsevier Ltd. All rights reserved.
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