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Scapulothoracic and glenohumeral kinematics following an external rotation fatigue protocol.

Authors
Ebaugh-DD; McClure-PW; Karduna-AR
Source
J Orthop Sports Phys Ther 2006 Aug; 36(8):557-571
NIOSHTIC No.
20030762
Abstract
Study Design: Repeated-measures experimental design. Objective: To determine the effects of shoulder external rotator muscle fatigue on 3-dimensional scapulothoracic and glenohumeral kinematics. Background: The external rotator muscles of the shoulder are important for normal shoulder function. Impaired performance of these muscles has been observed in subjects with impingement syndrome and it is possible that external rotator muscle fatigue leads to altered kinematics of the shoulder girdle. Methods and Measures: Twenty subjects without a history of shoulder pathology participated in this study. Three-dimensional scapulothoracic and glenohumeral kinematics were determined from electromagnetic sensors attached to the scapula, humerus, and thorax. Surface electromyographic (EMG) data were collected from the upper and lower trapezius, serratus anterior, anterior and posterior deltoid, and infraspinatus muscles. Median power frequency (MPF) values were derived from the raw EMG data and were used to indicate the degree of local muscle fatigue. Kinematic and EMG measures were collected prior to and immediately following the performance of a shoulder external rotation fatigue protocol. Results: After completing the fatigue protocol subjects demonstrated less external rotation of the humerus. Additionally, they had less posterior tilt of the scapula in the beginning phase of arm elevation, and more scapular upward rotation and clavicular retraction in the mid ranges of arm elevation. Conclusions: Performance of an external rotation fatigue protocol results in altered scapulothoracic and glenohumeral kinematics. Further studies are needed to investigate the effects of external rotator muscle fatigue on scapulothoracic and glenohumeral kinematics in subjects with shoulder pathology.
Keywords
Humans; Muscle-function; Musculoskeletal-system; Musculoskeletal-system-disorders; Muscle-physiology; Skeletal-system; Skeletal-movement; Biomechanics; Ergonomics; Repetitive-work; Cumulative-trauma; Cumulative-trauma-disorders
Contact
Programs in Rehabilitation Sciences, Drexel University, Philadelphia, PA 19102-1192
CODEN
JOSPDV
Publication Date
20060801
Document Type
Journal Article
Email Address
debaugh@drexel.edu
Funding Amount
75750
Funding Type
Grant
Fiscal Year
2006
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R03-OH-003869
Issue of Publication
8
ISSN
0190-6011
Source Name
Journal of Orthopaedic and Sports Physical Therapy
State
PA
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