Electromyographic Responses from the Vastus Medialis during Isometric Muscle Actions

C M Smith; T J Housh; T Herda; J M Zuniga; C L Camic; H C Bergstrom; D B Smith; J P Weir; J T Cramer; E C Hill; K C Cochrane; N D M Jenkins; R J Schmidt; G Johnson

doi:10.1055/s-0035-1564174

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Electromyographic Responses from the Vastus Medialis during Isometric Muscle Actions

Journal article

Peer reviewed

Electromyographic Responses from the Vastus Medialis during Isometric Muscle Actions

C M Smith, T J Housh, T Herda, J M Zuniga, C L Camic, H C Bergstrom, D B Smith, J P Weir, J T Cramer, E C Hill, …

International journal of sports medicine, Vol.37(8), pp.647-652

07/2016

DOI: 10.1055/s-0035-1564174

PMID: 27176892

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Abstract

This study examined the electromyographic (EMG) responses from the vastus medialis (VM) for electrodes placed over and away from the innervation zone (IZ) during a maximal voluntary isometric contraction (MVIC) and sustained, submaximal isometric muscle action. A linear electrode array was placed on the VM to identify the IZ and muscle fiber pennation angle during an MVIC and sustained isometric muscle action at 50% MVIC. EMG amplitude and frequency parameters were determined from 7 bipolar channels of the electrode array, including over the IZ, as well as 10 mm, 20 mm and 30 mm proximal and distal to the IZ. There were no differences between the channels for the patterns of responses for EMG amplitude or mean power frequency during the sustained, submaximal isometric muscle action; however, there were differences between channels during the MVIC. The results of the present study supported the need to standardize the placement of electrodes on the VM for the assessment of EMG amplitude and mean power frequency. Based on the current findings, it is recommended that electrode placements be distal to the IZ and aligned with the muscle fiber pennation angle during MVICs, as well as sustained, submaximal isometric muscle actions.

Electrodes

Electromyography - methods

Female

Humans

Isometric Contraction

Male

Quadriceps Muscle - innervation

Quadriceps Muscle - physiology

Young Adult

Details

Title: Subtitle: Electromyographic Responses from the Vastus Medialis during Isometric Muscle Actions
Creators: C M Smith - University of Nebraska–Lincoln
T J Housh - University of Nebraska–Lincoln
T Herda - University of Kansas
J M Zuniga - Creighton University
C L Camic - University of Wisconsin–La Crosse
H C Bergstrom - University of Nebraska–Lincoln
D B Smith - Oklahoma State University
J P Weir - University of Kansas
J T Cramer - University of Nebraska–Lincoln
E C Hill - Nutrition and Health Sciences, Ethan Hill, Lincoln, United States
K C Cochrane - University of Nebraska–Lincoln
N D M Jenkins - University of Nebraska–Lincoln
R J Schmidt - University of Nebraska–Lincoln
G Johnson - University of Nebraska–Lincoln
Resource Type: Journal article
Publication Details: International journal of sports medicine, Vol.37(8), pp.647-652
DOI: 10.1055/s-0035-1564174
PMID: 27176892
NLM abbreviation: Int J Sports Med
ISSN: 0172-4622
eISSN: 1439-3964
Language: English
Date published: 07/2016
Academic Unit: Center for Social Science Innovation; Injury Prevention Research Center; Health, Sport, and Human Physiology
Record Identifier: 9984259390302771

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