Timing of rotator cuff activation during shoulder external rotation in throwers with and without symptoms of pain

Hess, Sally Anne, Richardson, Carolyn A., Darnell, Ross, Friis, Peter, Lisle, David and Myers, Peter (2005) Timing of rotator cuff activation during shoulder external rotation in throwers with and without symptoms of pain. Journal of Orthopaedic & Sports Physical Therapy, 35 12: 812-820.


Author Hess, Sally Anne
Richardson, Carolyn A.
Darnell, Ross
Friis, Peter
Lisle, David
Myers, Peter
Title Timing of rotator cuff activation during shoulder external rotation in throwers with and without symptoms of pain
Journal name Journal of Orthopaedic & Sports Physical Therapy  (ERA 2012 Listed)    (ERA 2010 Rank B)   Check publisher's open access policy
Publication date 2005
Sub-type Article
DOI 10.2519/jospt.2005.2134
Volume number 35
Issue number 12
ISSN 0190-6011
1938-1344
Start page 812
End page 820
Total pages 9
Place of publication Alexandria, VA, United States
Publisher American Physical Therapy Association
Language eng
Subject 11 Medical and Health Sciences
1106 Human Movement and Sports Science
Abstract Study Design: Fine-wire EMG rotator cuff onset time analysis in 2 matched groups of throwers with and without pain. Objective: To identify if there is a difference in the activation patterns of the rotator cuff muscles during a rapid shoulder external rotation task between throwers with and without pain. Background: The coordinated action of the rotator cuff is recognized as essential for glenohumeral joint control in the throwing athlete. Identification of abnormalities occurring in muscle activation patterns for injured athletes is relevant when prescribing rehabilitative exercises. Methods and Measures: Twelve throwers with shoulder pain were compared to a matched group of 11 asymptomatic throwers. Participants were matched for age, height, body mass, and habitual activity. Fine-wire EMG electrodes were inserted into the subscapularis, supraspinatus, and infraspinatus. EMG activity was measured during a reaction time task of rapid shoulder external rotation in a seated position. The timing of onset of EMG activity was analyzed in relation to visualization of a light (reaction time) and to the onset of infraspinatus activity (relative latency). Results: In the group with shoulder pain, the onset of subscapularis activity was found to be significantly delayed (reaction time, P = .0018; relative latency, P = .0005) from the onset of infraspinatus activity when compared to the control group. Conclusions: The presence of shoulder pain in these athletes was associated with a difference in the onset of subscapularis EMG activity during a rapid shoulder external rotation movement. This was an initial step in the understanding of the joint protection mechanisms of the glenohumeral joint and the problems that occur in throwers. This information may assist in providing future guidelines for more effective rehabilitation and prevention strategies for this condition.
Keyword Orthopedics
Rehabilitation
Sport Sciences
Baseball
Electromyography
Throwing
Electromyographic Analysis
Throwing Shoulder
Muscle-activity
Subscapularis Muscle
Baseball Pitchers
Upper Extremity
Instability
Mechanisms
Strength
Motion
Q-Index Code C1
Institutional Status UQ

 
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Created: Mon, 13 Aug 2007, 15:47:24 EST