Shoulder muscle activation and fatigue during a controlled forceful hand grip task

Alizadehkhaiyat, Omid and Fisher, A.C. and Kemp, G.J. and Vishwanathan, Karthik and Frostick, S.P. (2011) Shoulder muscle activation and fatigue during a controlled forceful hand grip task. Journal of Electromyography and Kinesiology, 21 (3). pp. 478-482. ISSN 1050-6411

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Purpose: Reliable electromyographic evaluation of the shoulder in common painful conditions is a major challenge due to a reduced range of movement and pain-related muscle inhibition. This study investigates the use of a hand grip task for the assessment of shoulder muscle activation.
Methods: Muscle activity and fatigue for supraspinatus and infraspinatus muscles were measured in 16 healthy controls using fine-wire electrodes during a controlled gripping task at 50% of maximum voluntary contraction, in a standardized sitting and arm position. Changes in muscle activity and fatigue were measured by the time-slope of root mean square amplitude and median frequency, respectively.
Results: A significant positive amplitude slope (p < 0.01) was found for both supraspinatus and infraspinatus, indicating that the task resulted in increasing muscle activity. Judging by the median frequency slope, there was no sign of fatigue progression.
Conclusion: A standardized hand grip task in a neutral position activates key rotator cuff muscles. This might provide a method for electromyographic assessment of shoulder girdle muscles which avoids problems due to pain-related limitation of movement, and might be useful in the development and monitoring of shoulder rehabilitation strategies.

Item Type: Article
Keywords: Fatigue; Fine-wire EMG; Grip; Muscle activity; Rotator cuff; Shoulder
Subjects: Q Science > QP Physiology
Faculty / Department: Faculty of Science > School of Health Sciences
Depositing User: Susan Murray
Date Deposited: 05 Mar 2014 12:32
Last Modified: 05 Mar 2014 12:32

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