A Comparison of EMG Signals from Surface and Fine-Wire Electrodes During Shoulder Abduction
- *Corresponding Author:
- Bala S Rajaratnam
School of Health Sciences (Allied Health)
Nanyang Polytechnic, Singapore
Tel: 6550 1349
E-mail: [email protected]
Received Date: February 02, 2014; Accepted Date: June 17, 2014; Published Date: June 20, 2014
Citation: Rajaratnam BS, CH Goh J, Kumar VP (2014) A Comparison of EMG Signals from Surface and Fine-Wire Electrodes During Shoulder Abduction. Int J Phys Med Rehabil 2:206. doi: 10.4172/2329-9096.1000206
Copyright: © 2014 Rajaratnam BS, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Electromyography quantifies the action of muscles and the data provides an understanding of how coordination occurs during an action. This concurrent comparison research study evaluated electromyography signals from surface and fine-wire electrodes placed simultaneously on selected shoulder muscles. A stand-alone data logger collected electromyography signals from both types of electrodes placed on and within the teres major, supraspinatus, infraspinatus and posterior deltoid muscles as 30 healthy adult subjects performed overhead shoulder abduction. There were poor correlation in the timing of onset and peak magnitudes between fine-wire and surface electrodes reading of teres major, infraspinatus and supraspinatus (onset r=-0.01-0.07; p>0.05, peak r=0.05-0.10; p>0.05). Readings from surface electrodes placed on the posterior deltoid was strongly correlated with its fine-wire temporal values (onset r=0.94, peak r=0.90; p<0.00). Fine-wire electrodes are able to record time sensitive information of how the rotator cuff muscles controls glenohumeral motion during overhead shoulder abduction. The findings are important when deciding to use electromyography to study muscle co-ordination at the shoulder for orthopaedic and neurological rehabilitation.