The effects of interelectrode distance on electromyographic amplitude and mean power frequency during isokinetic and isometric muscle actions of the biceps brachii

Travis W. Beck, Terry J. Housh, Glen O. Johnson, Joseph P. Weir, Joel T Cramer, Jared W. Coburn, Moh H. Malek

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

The purpose of this study was to examine the effects of interelectrode distance (IED) on the absolute and normalized electromyographic (EMG) amplitude and mean power frequency (MPF) versus isokinetic and isometric torque relationships for the biceps brachii muscle. Ten adults [mean ± SD age = 22.0 ± 3.4 years] performed submaximal to maximal, isokinetic and isometric muscle actions of the dominant forearm flexors. Following determination of isokinetic peak torque (PT) and the isometric maximum voluntary contraction (MVC), the subjects performed randomly ordered, submaximal step muscle actions in 10% increments from 10% to 90% PT and MVC. Surface EMG signals were recorded simultaneously from bipolar electrode arrangements placed over the biceps brachii muscle with IEDs of 20, 40, and 60 mm. Absolute and normalized EMG amplitude (μVrms and %max) increased linearly with torque during the isokinetic and isometric muscle actions (r 2 range = 0.988-0.998), but there were no significant changes for absolute or normalized EMG MPF (Hz or %max) from 10% to 100% PT and MVC. In some cases, there were significant (p < 0.05) differences among the three IED arrangements for absolute EMG amplitude and MPF values, but not for the normalized values. These findings suggested that for the biceps brachii muscle, IEDs between 20 and 60 mm resulted in similar patterns for the EMG amplitude or MPF versus dynamic and isometric torque relationships. Furthermore, unlike the absolute EMG amplitude and MPF values, the normalized EMG data were not influenced by changes in IED between 20 and 60 mm. Thus, normalized EMG data can be compared among previous studies that have utilized different IED arrangements.

Original languageEnglish (US)
Pages (from-to)482-495
Number of pages14
JournalJournal of Electromyography and Kinesiology
Volume15
Issue number5
DOIs
StatePublished - Oct 1 2005

Fingerprint

Torque
Muscles
Forearm
Electrodes

Keywords

  • Electromyography
  • Interelectrode distance
  • Isokinetic torque
  • Isometric torque
  • Normalization

ASJC Scopus subject areas

  • Neuroscience (miscellaneous)
  • Biophysics
  • Clinical Neurology

Cite this

The effects of interelectrode distance on electromyographic amplitude and mean power frequency during isokinetic and isometric muscle actions of the biceps brachii. / Beck, Travis W.; Housh, Terry J.; Johnson, Glen O.; Weir, Joseph P.; Cramer, Joel T; Coburn, Jared W.; Malek, Moh H.

In: Journal of Electromyography and Kinesiology, Vol. 15, No. 5, 01.10.2005, p. 482-495.

Research output: Contribution to journalArticle

Beck, Travis W. ; Housh, Terry J. ; Johnson, Glen O. ; Weir, Joseph P. ; Cramer, Joel T ; Coburn, Jared W. ; Malek, Moh H. / The effects of interelectrode distance on electromyographic amplitude and mean power frequency during isokinetic and isometric muscle actions of the biceps brachii. In: Journal of Electromyography and Kinesiology. 2005 ; Vol. 15, No. 5. pp. 482-495.
@article{4e2d054d35d64576ba5ede92c366d50d,
title = "The effects of interelectrode distance on electromyographic amplitude and mean power frequency during isokinetic and isometric muscle actions of the biceps brachii",
abstract = "The purpose of this study was to examine the effects of interelectrode distance (IED) on the absolute and normalized electromyographic (EMG) amplitude and mean power frequency (MPF) versus isokinetic and isometric torque relationships for the biceps brachii muscle. Ten adults [mean ± SD age = 22.0 ± 3.4 years] performed submaximal to maximal, isokinetic and isometric muscle actions of the dominant forearm flexors. Following determination of isokinetic peak torque (PT) and the isometric maximum voluntary contraction (MVC), the subjects performed randomly ordered, submaximal step muscle actions in 10{\%} increments from 10{\%} to 90{\%} PT and MVC. Surface EMG signals were recorded simultaneously from bipolar electrode arrangements placed over the biceps brachii muscle with IEDs of 20, 40, and 60 mm. Absolute and normalized EMG amplitude (μVrms and {\%}max) increased linearly with torque during the isokinetic and isometric muscle actions (r 2 range = 0.988-0.998), but there were no significant changes for absolute or normalized EMG MPF (Hz or {\%}max) from 10{\%} to 100{\%} PT and MVC. In some cases, there were significant (p < 0.05) differences among the three IED arrangements for absolute EMG amplitude and MPF values, but not for the normalized values. These findings suggested that for the biceps brachii muscle, IEDs between 20 and 60 mm resulted in similar patterns for the EMG amplitude or MPF versus dynamic and isometric torque relationships. Furthermore, unlike the absolute EMG amplitude and MPF values, the normalized EMG data were not influenced by changes in IED between 20 and 60 mm. Thus, normalized EMG data can be compared among previous studies that have utilized different IED arrangements.",
keywords = "Electromyography, Interelectrode distance, Isokinetic torque, Isometric torque, Normalization",
author = "Beck, {Travis W.} and Housh, {Terry J.} and Johnson, {Glen O.} and Weir, {Joseph P.} and Cramer, {Joel T} and Coburn, {Jared W.} and Malek, {Moh H.}",
year = "2005",
month = "10",
day = "1",
doi = "10.1016/j.jelekin.2004.12.001",
language = "English (US)",
volume = "15",
pages = "482--495",
journal = "Journal of Electromyography and Kinesiology",
issn = "1050-6411",
publisher = "Elsevier Limited",
number = "5",

}

TY - JOUR

T1 - The effects of interelectrode distance on electromyographic amplitude and mean power frequency during isokinetic and isometric muscle actions of the biceps brachii

AU - Beck, Travis W.

AU - Housh, Terry J.

AU - Johnson, Glen O.

AU - Weir, Joseph P.

AU - Cramer, Joel T

AU - Coburn, Jared W.

AU - Malek, Moh H.

PY - 2005/10/1

Y1 - 2005/10/1

N2 - The purpose of this study was to examine the effects of interelectrode distance (IED) on the absolute and normalized electromyographic (EMG) amplitude and mean power frequency (MPF) versus isokinetic and isometric torque relationships for the biceps brachii muscle. Ten adults [mean ± SD age = 22.0 ± 3.4 years] performed submaximal to maximal, isokinetic and isometric muscle actions of the dominant forearm flexors. Following determination of isokinetic peak torque (PT) and the isometric maximum voluntary contraction (MVC), the subjects performed randomly ordered, submaximal step muscle actions in 10% increments from 10% to 90% PT and MVC. Surface EMG signals were recorded simultaneously from bipolar electrode arrangements placed over the biceps brachii muscle with IEDs of 20, 40, and 60 mm. Absolute and normalized EMG amplitude (μVrms and %max) increased linearly with torque during the isokinetic and isometric muscle actions (r 2 range = 0.988-0.998), but there were no significant changes for absolute or normalized EMG MPF (Hz or %max) from 10% to 100% PT and MVC. In some cases, there were significant (p < 0.05) differences among the three IED arrangements for absolute EMG amplitude and MPF values, but not for the normalized values. These findings suggested that for the biceps brachii muscle, IEDs between 20 and 60 mm resulted in similar patterns for the EMG amplitude or MPF versus dynamic and isometric torque relationships. Furthermore, unlike the absolute EMG amplitude and MPF values, the normalized EMG data were not influenced by changes in IED between 20 and 60 mm. Thus, normalized EMG data can be compared among previous studies that have utilized different IED arrangements.

AB - The purpose of this study was to examine the effects of interelectrode distance (IED) on the absolute and normalized electromyographic (EMG) amplitude and mean power frequency (MPF) versus isokinetic and isometric torque relationships for the biceps brachii muscle. Ten adults [mean ± SD age = 22.0 ± 3.4 years] performed submaximal to maximal, isokinetic and isometric muscle actions of the dominant forearm flexors. Following determination of isokinetic peak torque (PT) and the isometric maximum voluntary contraction (MVC), the subjects performed randomly ordered, submaximal step muscle actions in 10% increments from 10% to 90% PT and MVC. Surface EMG signals were recorded simultaneously from bipolar electrode arrangements placed over the biceps brachii muscle with IEDs of 20, 40, and 60 mm. Absolute and normalized EMG amplitude (μVrms and %max) increased linearly with torque during the isokinetic and isometric muscle actions (r 2 range = 0.988-0.998), but there were no significant changes for absolute or normalized EMG MPF (Hz or %max) from 10% to 100% PT and MVC. In some cases, there were significant (p < 0.05) differences among the three IED arrangements for absolute EMG amplitude and MPF values, but not for the normalized values. These findings suggested that for the biceps brachii muscle, IEDs between 20 and 60 mm resulted in similar patterns for the EMG amplitude or MPF versus dynamic and isometric torque relationships. Furthermore, unlike the absolute EMG amplitude and MPF values, the normalized EMG data were not influenced by changes in IED between 20 and 60 mm. Thus, normalized EMG data can be compared among previous studies that have utilized different IED arrangements.

KW - Electromyography

KW - Interelectrode distance

KW - Isokinetic torque

KW - Isometric torque

KW - Normalization

UR - http://www.scopus.com/inward/record.url?scp=20444391057&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=20444391057&partnerID=8YFLogxK

U2 - 10.1016/j.jelekin.2004.12.001

DO - 10.1016/j.jelekin.2004.12.001

M3 - Article

VL - 15

SP - 482

EP - 495

JO - Journal of Electromyography and Kinesiology

JF - Journal of Electromyography and Kinesiology

SN - 1050-6411

IS - 5

ER -