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Licensed Unlicensed Requires Authentication Published by De Gruyter September 9, 2013

Effects of anthropometric variables and electrode placement on the SEMG activity of the biceps brachii muscle during submaximal isometric contraction in arm wrestling

  • Nizam Uddin Ahamed EMAIL logo , Kenneth Sundaraj , Badlishah Ahmad , Matiur Rahman , Md. Asraf Ali and Md. Anamul Islam

Abstract

Surface electromyography (SEMG) has been widely used to analyze the biceps brachii (BB) muscle during voluntary contraction, and the effect of the interelectrode distance has been studied. However, the effect of anthropometric variations and the placement of electrodes on the BB activity during arm wrestling (i.e., during isometric contraction at a submaximal intensity) has seldom been investigated. In this study, the BB strength throughout this type of static contraction was evaluated. The SEMG signals were recorded from three locations on the BB: the muscle belly (M), near proximal (P), and distal tendon (L) regions. Twenty subjects who participated in the experiment were divided into five groups (A, B, C, D, and E). The average SEMG, root mean square, and variability of the signal were calculated using the coefficient of variance. The results indicated that the M region was more active and exhibited increased signal consistency (10.91%) compared with the other two regions (P: 24.47% and L: 19.13%). Significant differences were observed between the L and P regions and between the M and P regions (p<0.05); however, there were no differences between the M and L regions (p>0.05). The increase in the SEMG value in groups B and C was significant (p<0.05), whereas groups A, D, and E did not exhibit a significant increase (p>0.05). In addition, muscle size was the strongest predictor of strength compared with body weight and height. The results suggest that the M region displays considerable SEMG effects and signal reliability. Furthermore, the SEMG measurements were found to correlate strongly with the strength of the contractions and the muscle size, and not with weight and height.


Corresponding author: Nizam Uddin Ahamed, AI-Rehab Research Group, Universiti Malaysia Perlis (UniMAP), Kampus Pauh Putra, 02600 Arau, Perlis, Malaysia, Phone: +6049767399, Fax: +6049851695, E-mail:

The authors wish to thank all the members of AI-Rehab Research Group (AI-Rehab), the volunteers who participated in this study, and the members of the ethical committee at University Malaysia Perlis (UniMAP), Malaysia. There are no conflicts of interest for the authors and the outcome of this study.

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Received: 2013-1-16
Accepted: 2013-6-25
Published Online: 2013-09-09
Published in Print: 2013-10-01

©2013 by Walter de Gruyter Berlin Boston

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