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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/7752/1/Article_Nizam.docx
http://umpir.ump.edu.my/id/eprint/7752/
http://iospress.metapress.com/content/j18645234854tp05/?p=39edaff856d448bfb927e022b6b83be5&pi=0
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spelling my.ump.umpir.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
institution Universiti Malaysia Pahang
building UMP Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Pahang
content_source UMP Institutional Repository
url_provider http://umpir.ump.edu.my/
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/7752/1/Article_Nizam.docx
http://umpir.ump.edu.my/id/eprint/7752/
http://iospress.metapress.com/content/j18645234854tp05/?p=39edaff856d448bfb927e022b6b83be5&pi=0
_version_ 1662754704927490048
score 13.211869

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