Normal shoulder muscular activation and co-ordination during a shoulder elevation task based on activities of daily living: An electromyographic study

Hawkes, David H. and Alizadehkhaiyat, Omid and Fisher, Anthony C. and Kemp, Graham J. and Roebuck, Margaret M. and Frostick, Simon P. (2011) Normal shoulder muscular activation and co-ordination during a shoulder elevation task based on activities of daily living: An electromyographic study. Journal of Orthopaedic Research, 30 (1). pp. 53-60. ISSN 0736-0266

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/jor.214...

Abstract

Studies of normal shoulder function have often failed to consider the inter-relationship between different muscle groups in activities relevant to daily life. Upper limb functional status was assessed in 12 healthy male volunteers using the Functional Impairment Test-Hand, Neck, Shoulder and Arm test (FIT-HaNSA). Electromyography was then used to study the activity and coordination of 13 muscles (10 by surface electrodes, 3 by fine-wire intramuscular electrodes) around the shoulder during a dynamic movement task based on the shelf-lifting task in FIT-HaNSA. Muscles were grouped for analysis into deltoid (anterior, middle, and posterior divisions), adductors (latissimus dorsi and teres major), rotator cuff (supraspinatus, infraspinatus, and subscapularis), and elbow flexor (brachioradialis, biceps brachii) groups. There were no significant inter-session effects. Using cross-correlation analysis to investigate the whole time-course of activation, there were highly significant positive correlations (p < 0.001) between the deltoid and rotator cuff, the deltoid and adductor and the adductor and rotator cuff groups, and a significant negative correlation between the deltoid and elbow flexor groups (p = 0.031). We conclude that the deltoid, adductor, and rotator cuff muscles all contribute to the muscular component of glenohumeral joint stability. Muscular stability can be adapted as required to meet task-specific demands

Item Type: Article
Keywords: electromyography; shoulder; glenohumeral joint; joint stability; muscle activation
Subjects: Q Science > QP Physiology
Faculty / Department: Faculty of Science > School of Health Sciences
Depositing User: Susan Murray
Date Deposited: 05 Mar 2014 12:31
Last Modified: 05 Mar 2014 12:31
URI: http://hira.hope.ac.uk/id/eprint/336

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