EMG activity normalization for trunk muscles in subjects with and without back pain

Ng, J. K. F., Kippers, V., Parnianpour, M. and Richardson, C. A. (2002) EMG activity normalization for trunk muscles in subjects with and without back pain. Medicine And Science In Sports And Exercise, 34 7: 1082-1086. doi:10.1097/00005768-200207000-00005

Author Ng, J. K. F.
Kippers, V.
Parnianpour, M.
Richardson, C. A.
Title EMG activity normalization for trunk muscles in subjects with and without back pain
Journal name Medicine And Science In Sports And Exercise   Check publisher's open access policy
ISSN 0195-9131
Publication date 2002-01-01
Sub-type Article (original research)
DOI 10.1097/00005768-200207000-00005
Volume 34
Issue 7
Start page 1082
End page 1086
Total pages 5
Editor Kenneth O. Wilson
Place of publication United States
Publisher Lippincott Williams & Wilkins
Language eng
Subject C1
321024 Rehabilitation and Therapy - Occupational and Physical
730303 Occupational, speech and physiotherapy
1106 Human Movement and Sports Science
Abstract Purpose: The aims of the present study were to examine electromyographic (EMG) activity of six bilateral trunk muscles during maximal contraction in three cardinal planes, and to determine the direction of contraction that gives maximal activation for each muscle. both for healthy subjects and back-pain patients. Methods: Twenty-eight healthy subjects and 15 back-pain patients performed maximum voluntary contractions in three cardinal planes, Surface EMG signals were recorded from rectus abdominis, external oblique, internal oblique, latissimus dorsi, iliocostalis lumborum, and multifidus bilaterally. Root mean square values of the EMG data were calculated to quantify I the amplitude of EMG signals. Results: For both healthy subjects and back-pain patients. one single direction of contraction was found to give the maximum EMG signals for most muscles. Rectus abdominis demonstrated maximal activity in trunk flexion, external oblique in lateral flexion. internal oblique in axial rotation, and multifidus in extension. For the latissimus dorsi and iliocostalis lumborum. maximal activity was demonstrated in more than one cardinal plane. Conclusion: This study has implications for future research involving normalization of muscle activity to maximal levels required in many trunk EMG studies. As the latissimus dorsi and iliocostalis lumborum demonstrate individual differences in the plane that gives maximal activity, these muscles may require testing in more than one plane.
Keyword Sport Sciences
Abdominal Muscles
Back Muscles
Isometric Contraction
Low-back Pain
Surface Electromyography
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Human Movement and Nutrition Sciences Publications
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Citation counts: TR Web of Science Citation Count  Cited 37 times in Thomson Reuters Web of Science Article | Citations
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Created: Wed, 15 Aug 2007, 04:54:10 EST