EMG-force relationship during static contraction: Effects on sensor placement locations on biceps brachii muscle

BACKGROUND: The relationship between surface electromyography (EMG) and force have been the subject of ongoing investigations and remain a subject of controversy. Even under static conditions, the relationships at different sensor placement locations in the biceps brachii (BB) muscle are complex.OBJ...

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Main Authors:	Ahamed, Nizam Uddin, Sundaraj, K, Alqahtani, Mahdi, Altwijri, Omar, Ali, A, Islam, A
Format:	Article
Language:	English
Published:	IOS Press 2014
Subjects:	TA Engineering (General). Civil engineering (General)
Online Access:	http://umpir.ump.edu.my/id/eprint/7752/ http://umpir.ump.edu.my/id/eprint/7752/ http://umpir.ump.edu.my/id/eprint/7752/ http://umpir.ump.edu.my/id/eprint/7752/1/Article_Nizam.docx

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recordtype	eprints
spelling	ump-77522020-02-28T01:59:42Z http://umpir.ump.edu.my/id/eprint/7752/ EMG-force relationship during static contraction: Effects on sensor placement locations on biceps brachii muscle Ahamed, Nizam Uddin Sundaraj, K Alqahtani, Mahdi Altwijri, Omar Ali, A Islam, A TA Engineering (General). Civil engineering (General) BACKGROUND: The relationship between surface electromyography (EMG) and force have been the subject of ongoing investigations and remain a subject of controversy. Even under static conditions, the relationships at different sensor placement locations in the biceps brachii (BB) muscle are complex.OBJECTIVE: The aim of this study was to compare the activity and relationship between surface EMG and static force from the BB muscle in terms of three sensor placement locations. METHODS: Twenty-one right hand dominant male subjects (age 25.3 ± 1.2 years) participated in the study. Surface EMG signals were detected from the subject's right BB muscle. The muscle activation during force was determined as the root mean square (RMS) electromyographic signal normalized to the peak RMS EMG signal of isometric contraction for 10 s. The statistical analysis included linear regression to examine the relationship between EMG amplitude and force of contraction [40–100% of maximal voluntary contraction (MVC)], repeated measures ANOVA to assess differences among the sensor placement locations, and coefficient of variation (CoV) for muscle activity variation.RESULTS: The results demonstrated that when the sensor was placed on the muscle belly, the linear slope coefficient was significantly greater for EMG versus force testing (r^2= 0.62, P < 0.05) than when placed on the lower part (r^2= 0.31, P> 0.05) and upper part of the muscle belly (r^2= 0.29, P< 0.05). In addition, the EMG signal activity on the muscle belly had less variability than the upper and lower parts (8.55% vs. 15.12% and 12.86%, respectively). CONCLUSION: These findings indicate the importance of applying the surface EMG sensor at the appropriate locations that follow muscle fiber orientation of the BB muscle during static contraction. As a result, EMG signals of three different placements may help to understand the difference in the amplitude of the signals due to placement. IOS Press 2014-07-24 Article PeerReviewed application/msword en http://umpir.ump.edu.my/id/eprint/7752/1/Article_Nizam.docx Ahamed, Nizam Uddin and Sundaraj, K and Alqahtani, Mahdi and Altwijri, Omar and Ali, A and Islam, A (2014) EMG-force relationship during static contraction: Effects on sensor placement locations on biceps brachii muscle. Technology and Health Care, 22 (4). pp. 505-513. ISSN 0928-7329 http://iospress.metapress.com/content/j18645234854tp05/?p=39edaff856d448bfb927e022b6b83be5&pi=0 10.3233/THC-140842
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Pahang
building	UMP Institutional Repository
collection	Online Access
language	English
topic	TA Engineering (General). Civil engineering (General)
spellingShingle	TA Engineering (General). Civil engineering (General) Ahamed, Nizam Uddin Sundaraj, K Alqahtani, Mahdi Altwijri, Omar Ali, A Islam, A EMG-force relationship during static contraction: Effects on sensor placement locations on biceps brachii muscle
description	BACKGROUND: The relationship between surface electromyography (EMG) and force have been the subject of ongoing investigations and remain a subject of controversy. Even under static conditions, the relationships at different sensor placement locations in the biceps brachii (BB) muscle are complex.OBJECTIVE: The aim of this study was to compare the activity and relationship between surface EMG and static force from the BB muscle in terms of three sensor placement locations. METHODS: Twenty-one right hand dominant male subjects (age 25.3 ± 1.2 years) participated in the study. Surface EMG signals were detected from the subject's right BB muscle. The muscle activation during force was determined as the root mean square (RMS) electromyographic signal normalized to the peak RMS EMG signal of isometric contraction for 10 s. The statistical analysis included linear regression to examine the relationship between EMG amplitude and force of contraction [40–100% of maximal voluntary contraction (MVC)], repeated measures ANOVA to assess differences among the sensor placement locations, and coefficient of variation (CoV) for muscle activity variation.RESULTS: The results demonstrated that when the sensor was placed on the muscle belly, the linear slope coefficient was significantly greater for EMG versus force testing (r^2= 0.62, P < 0.05) than when placed on the lower part (r^2= 0.31, P> 0.05) and upper part of the muscle belly (r^2= 0.29, P< 0.05). In addition, the EMG signal activity on the muscle belly had less variability than the upper and lower parts (8.55% vs. 15.12% and 12.86%, respectively). CONCLUSION: These findings indicate the importance of applying the surface EMG sensor at the appropriate locations that follow muscle fiber orientation of the BB muscle during static contraction. As a result, EMG signals of three different placements may help to understand the difference in the amplitude of the signals due to placement.
format	Article
author	Ahamed, Nizam Uddin Sundaraj, K Alqahtani, Mahdi Altwijri, Omar Ali, A Islam, A
author_facet	Ahamed, Nizam Uddin Sundaraj, K Alqahtani, Mahdi Altwijri, Omar Ali, A Islam, A
author_sort	Ahamed, Nizam Uddin
title	EMG-force relationship during static contraction: Effects on sensor placement locations on biceps brachii muscle
title_short	EMG-force relationship during static contraction: Effects on sensor placement locations on biceps brachii muscle
title_full	EMG-force relationship during static contraction: Effects on sensor placement locations on biceps brachii muscle
title_fullStr	EMG-force relationship during static contraction: Effects on sensor placement locations on biceps brachii muscle
title_full_unstemmed	EMG-force relationship during static contraction: Effects on sensor placement locations on biceps brachii muscle
title_sort	emg-force relationship during static contraction: effects on sensor placement locations on biceps brachii muscle
publisher	IOS Press
publishDate	2014
url	http://umpir.ump.edu.my/id/eprint/7752/ http://umpir.ump.edu.my/id/eprint/7752/ http://umpir.ump.edu.my/id/eprint/7752/ http://umpir.ump.edu.my/id/eprint/7752/1/Article_Nizam.docx
first_indexed	2023-09-18T22:04:42Z
last_indexed	2023-09-18T22:04:42Z
_version_	1777414630025461760

EMG-force relationship during static contraction: Effects on sensor placement locations on biceps brachii muscle

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