Neuromuscular Compartmentalization of the Vastus Medialis Muscle: Comparison of the Activity of the Vastus Medialis Obliquus and the Vastus Medialis Longus by High Density Electromyography

SUMMARY: Anatomical studies describe the vastus medialis (VM) as being subdivided into two morphologically distinct components, the vastus medialis obliquus (VMO) and the vastus medialis longus (VML). However, there are discrepancies regarding the functional differentiation of these components. The...

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Autores principales:	Guzmán-Venegas,Rodrigo, Valencia,Oscar, Cadore,Eduardo L, izquierdo,Mikel
Lenguaje:	English
Publicado:	Sociedad Chilena de Anatomía 2021
Materias:	Heterogeneous recruitment Muscle activation pattern Functional compartmentalization Vastus medialis muscle
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022021000100205
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spelling	oai:scielo:S0717-950220210001002052021-03-01Neuromuscular Compartmentalization of the Vastus Medialis Muscle: Comparison of the Activity of the Vastus Medialis Obliquus and the Vastus Medialis Longus by High Density ElectromyographyGuzmán-Venegas,RodrigoValencia,OscarCadore,Eduardo Lizquierdo,Mikel Heterogeneous recruitment Muscle activation pattern Functional compartmentalization Vastus medialis muscle SUMMARY: Anatomical studies describe the vastus medialis (VM) as being subdivided into two morphologically distinct components, the vastus medialis obliquus (VMO) and the vastus medialis longus (VML). However, there are discrepancies regarding the functional differentiation of these components. The aim of this study was to compare the levels of activation of the VMO and the VML by high density surface electromyography. Twelve healthy young women (age: 21.4 ± 2.0 years; weight: 58.1 ± 7.5 kg; height: 1.6 ± 0.1 m), performed an open kinetic chain knee exercise during which the EMG activity of the VMO and the VML was recorded with two- dimensional matrices of 32 surface electrodes. The exercises were performed with three levels of resistance (5, 10 and 15 % of the body weight (BW)), considering three phases: concentric, isometric and excentric. In the isometric phase the VMO had greater activation than the VML with the three levels of resistance (p<0.05). In the excentric phase, the VMO also showed greater activation than the VML with the 10 and 15 % BW resistance levels, while in the concentric phase, the VMO showed greater activity than the VML with only the 15 % BW resistance. The results indicated significant differences in the activation level of the two components of the VM. This bears importance in the development of exercises intended to achieve a greater or more selective activation of the VMO. In the sample subjected to evaluation, the EMG recordings describe a greater activation of the VMO in comparison to the VML, which is more important in the isometric and excentric phases of the flexion/extension of the knee in an open kinetic chain. These findings suggest a functional compartmentalization of the VM.info:eu-repo/semantics/openAccessSociedad Chilena de AnatomíaInternational Journal of Morphology v.39 n.1 20212021-02-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022021000100205en10.4067/S0717-95022021000100205
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Heterogeneous recruitment Muscle activation pattern Functional compartmentalization Vastus medialis muscle
spellingShingle	Heterogeneous recruitment Muscle activation pattern Functional compartmentalization Vastus medialis muscle Guzmán-Venegas,Rodrigo Valencia,Oscar Cadore,Eduardo L izquierdo,Mikel Neuromuscular Compartmentalization of the Vastus Medialis Muscle: Comparison of the Activity of the Vastus Medialis Obliquus and the Vastus Medialis Longus by High Density Electromyography
description	SUMMARY: Anatomical studies describe the vastus medialis (VM) as being subdivided into two morphologically distinct components, the vastus medialis obliquus (VMO) and the vastus medialis longus (VML). However, there are discrepancies regarding the functional differentiation of these components. The aim of this study was to compare the levels of activation of the VMO and the VML by high density surface electromyography. Twelve healthy young women (age: 21.4 ± 2.0 years; weight: 58.1 ± 7.5 kg; height: 1.6 ± 0.1 m), performed an open kinetic chain knee exercise during which the EMG activity of the VMO and the VML was recorded with two- dimensional matrices of 32 surface electrodes. The exercises were performed with three levels of resistance (5, 10 and 15 % of the body weight (BW)), considering three phases: concentric, isometric and excentric. In the isometric phase the VMO had greater activation than the VML with the three levels of resistance (p<0.05). In the excentric phase, the VMO also showed greater activation than the VML with the 10 and 15 % BW resistance levels, while in the concentric phase, the VMO showed greater activity than the VML with only the 15 % BW resistance. The results indicated significant differences in the activation level of the two components of the VM. This bears importance in the development of exercises intended to achieve a greater or more selective activation of the VMO. In the sample subjected to evaluation, the EMG recordings describe a greater activation of the VMO in comparison to the VML, which is more important in the isometric and excentric phases of the flexion/extension of the knee in an open kinetic chain. These findings suggest a functional compartmentalization of the VM.
author	Guzmán-Venegas,Rodrigo Valencia,Oscar Cadore,Eduardo L izquierdo,Mikel
author_facet	Guzmán-Venegas,Rodrigo Valencia,Oscar Cadore,Eduardo L izquierdo,Mikel
author_sort	Guzmán-Venegas,Rodrigo
title	Neuromuscular Compartmentalization of the Vastus Medialis Muscle: Comparison of the Activity of the Vastus Medialis Obliquus and the Vastus Medialis Longus by High Density Electromyography
title_short	Neuromuscular Compartmentalization of the Vastus Medialis Muscle: Comparison of the Activity of the Vastus Medialis Obliquus and the Vastus Medialis Longus by High Density Electromyography
title_full	Neuromuscular Compartmentalization of the Vastus Medialis Muscle: Comparison of the Activity of the Vastus Medialis Obliquus and the Vastus Medialis Longus by High Density Electromyography
title_fullStr	Neuromuscular Compartmentalization of the Vastus Medialis Muscle: Comparison of the Activity of the Vastus Medialis Obliquus and the Vastus Medialis Longus by High Density Electromyography
title_full_unstemmed	Neuromuscular Compartmentalization of the Vastus Medialis Muscle: Comparison of the Activity of the Vastus Medialis Obliquus and the Vastus Medialis Longus by High Density Electromyography
title_sort	neuromuscular compartmentalization of the vastus medialis muscle: comparison of the activity of the vastus medialis obliquus and the vastus medialis longus by high density electromyography
publisher	Sociedad Chilena de Anatomía
publishDate	2021
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022021000100205
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Neuromuscular Compartmentalization of the Vastus Medialis Muscle: Comparison of the Activity of the Vastus Medialis Obliquus and the Vastus Medialis Longus by High Density Electromyography

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