Abstract/Details

The influence of electrode placement over the innervation zone on electromyographic amplitude and mean power frequency versus isokinetic and isometric torque relationships


2007 2007

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Abstract (summary)

The purpose of this investigation was to examine the influence of electrode placement over the estimated innervation zone (IZ) for the vastus lateralis, as well as proximal and distal to the estimated IZ, on the torque-related patterns for electromyographic (EMG) amplitude and mean power frequency (MPF) during isokinetic and isometric muscle actions of the leg extensors. Eleven men performed submaximal to maximal concentric isokinetic, eccentric isokinetic, and isometric muscle actions of the dominant leg extensors. Surface EMG signals were recorded simultaneously from the vastus lateralis muscle with bipolar electrode arrangements placed over the estimated IZ, as well as proximal and distal to the estimated IZ. The results indicated that the absolute and normalized EMG amplitude versus torque relationships were best fit with the same regression model for the proximal, IZ, and distal electrode placement sites in 7 of the 11 subjects during the isokinetic muscle actions. There were no consistent patterns between subjects or electrode placement sites for the absolute and normalized EMG MPF versus isokinetic torque relationships. During the isometric muscle actions, the absolute and normalized EMG amplitude versus torque relationships were best fit with the same regression model for the three electrode placement sites in 7 of the 11 subjects. There were no consistent patterns between subjects or electrode placement sites for the absolute and normalized EMG MPF versus isometric torque relationships. These findings suggested that factors related to electrode placement (but not necessarily the IZ) may influence the patterns of responses for EMG amplitude versus torque during isometric muscle actions of the vastus lateralis, but not for dynamic muscle actions.

Indexing (details)


Subject
Biomedical research;
Surgery;
Sports medicine
Classification
0541: Biomedical research
0564: Surgery
0575: Sports medicine
Identifier / keyword
Health and environmental sciences; Applied sciences; Electrode placement; Electromyographic; Innervation; Isokinetic; Isometric; Mean power frequency; Torque
Title
The influence of electrode placement over the innervation zone on electromyographic amplitude and mean power frequency versus isokinetic and isometric torque relationships
Author
Beck, Travis Wayne
Number of pages
85
Publication year
2007
Degree date
2007
School code
0138
Source
DAI-B 67/12, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
Advisor
Housh, Terry J.
University/institution
The University of Nebraska - Lincoln
University location
United States -- Nebraska
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3247183
ProQuest document ID
304838166
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/304838166
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