Cargando…

Differences in onset timing between the vastus medialis and lateralis during concentric knee contraction in individuals with genu varum or valgum

[Purpose] The purpose of this study was to investigate the difference in onset timing between the vastus medialis and lateralis among the different knee alignments, as well as the best isokinetic angular velocity for an isokinetic concentric contraction. [Subjects] Fifty-two adults (20 with genu var...

Descripción completa

Detalles Bibliográficos
Autores principales: Park, Seol, Kong, Yong-Soo, Ko, Yu-Min, Jang, Gwon-Uk, Park, Ji-Won
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Society of Physical Therapy Science 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4434011/
https://www.ncbi.nlm.nih.gov/pubmed/25995590
http://dx.doi.org/10.1589/jpts.27.1207
_version_ 1782371707463401472
author Park, Seol
Kong, Yong-Soo
Ko, Yu-Min
Jang, Gwon-Uk
Park, Ji-Won
author_facet Park, Seol
Kong, Yong-Soo
Ko, Yu-Min
Jang, Gwon-Uk
Park, Ji-Won
author_sort Park, Seol
collection PubMed
description [Purpose] The purpose of this study was to investigate the difference in onset timing between the vastus medialis and lateralis among the different knee alignments, as well as the best isokinetic angular velocity for an isokinetic concentric contraction. [Subjects] Fifty-two adults (20 with genu varum, 12 genu valgum, and 20 controls) were enrolled in this study. Subjects with > 4 cm between the medial epicondyles of the knee were placed in the genu varum group, whereas subjects with > 4 cm between the medial malleolus of the ankle were placed in the genu valgum group. [Methods] Surface electromyography was used to measure the onset times of the vastus medialis and vastus lateralis during concentric contractions at 30, 60, and 90°/sec. [Results] The vastus lateralis showed more delayed firing than the vastus medialis in the genu varum group, whereas vastus medialis firing was delayed more than that of the vastus lateralis in the genu valgum group. No differences in onset timing were observed between the vastus medialis and lateralis according the different angular velocities during concentric contractions in all three groups. [Conclusion] Genu varum and valgum affect quadriceps firing. Therefore, selective rehabilitation training of the quadriceps femoris should be considered to prevent pain or knee malalignment deformities.
format Online
Article
Text
id pubmed-4434011
institution National Center for Biotechnology Information
language English
publishDate 2015
publisher The Society of Physical Therapy Science
record_format MEDLINE/PubMed
spelling pubmed-44340112015-05-20 Differences in onset timing between the vastus medialis and lateralis during concentric knee contraction in individuals with genu varum or valgum Park, Seol Kong, Yong-Soo Ko, Yu-Min Jang, Gwon-Uk Park, Ji-Won J Phys Ther Sci Original Article [Purpose] The purpose of this study was to investigate the difference in onset timing between the vastus medialis and lateralis among the different knee alignments, as well as the best isokinetic angular velocity for an isokinetic concentric contraction. [Subjects] Fifty-two adults (20 with genu varum, 12 genu valgum, and 20 controls) were enrolled in this study. Subjects with > 4 cm between the medial epicondyles of the knee were placed in the genu varum group, whereas subjects with > 4 cm between the medial malleolus of the ankle were placed in the genu valgum group. [Methods] Surface electromyography was used to measure the onset times of the vastus medialis and vastus lateralis during concentric contractions at 30, 60, and 90°/sec. [Results] The vastus lateralis showed more delayed firing than the vastus medialis in the genu varum group, whereas vastus medialis firing was delayed more than that of the vastus lateralis in the genu valgum group. No differences in onset timing were observed between the vastus medialis and lateralis according the different angular velocities during concentric contractions in all three groups. [Conclusion] Genu varum and valgum affect quadriceps firing. Therefore, selective rehabilitation training of the quadriceps femoris should be considered to prevent pain or knee malalignment deformities. The Society of Physical Therapy Science 2015-04-30 2015-04 /pmc/articles/PMC4434011/ /pubmed/25995590 http://dx.doi.org/10.1589/jpts.27.1207 Text en 2015©by the Society of Physical Therapy Science. Published by IPEC Inc. http://creativecommons.org/licenses/by-nc-nd/3.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives (by-nc-nd) License.
spellingShingle Original Article
Park, Seol
Kong, Yong-Soo
Ko, Yu-Min
Jang, Gwon-Uk
Park, Ji-Won
Differences in onset timing between the vastus medialis and lateralis during concentric knee contraction in individuals with genu varum or valgum
title Differences in onset timing between the vastus medialis and lateralis during concentric knee contraction in individuals with genu varum or valgum
title_full Differences in onset timing between the vastus medialis and lateralis during concentric knee contraction in individuals with genu varum or valgum
title_fullStr Differences in onset timing between the vastus medialis and lateralis during concentric knee contraction in individuals with genu varum or valgum
title_full_unstemmed Differences in onset timing between the vastus medialis and lateralis during concentric knee contraction in individuals with genu varum or valgum
title_short Differences in onset timing between the vastus medialis and lateralis during concentric knee contraction in individuals with genu varum or valgum
title_sort differences in onset timing between the vastus medialis and lateralis during concentric knee contraction in individuals with genu varum or valgum
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4434011/
https://www.ncbi.nlm.nih.gov/pubmed/25995590
http://dx.doi.org/10.1589/jpts.27.1207
work_keys_str_mv AT parkseol differencesinonsettimingbetweenthevastusmedialisandlateralisduringconcentrickneecontractioninindividualswithgenuvarumorvalgum
AT kongyongsoo differencesinonsettimingbetweenthevastusmedialisandlateralisduringconcentrickneecontractioninindividualswithgenuvarumorvalgum
AT koyumin differencesinonsettimingbetweenthevastusmedialisandlateralisduringconcentrickneecontractioninindividualswithgenuvarumorvalgum
AT janggwonuk differencesinonsettimingbetweenthevastusmedialisandlateralisduringconcentrickneecontractioninindividualswithgenuvarumorvalgum
AT parkjiwon differencesinonsettimingbetweenthevastusmedialisandlateralisduringconcentrickneecontractioninindividualswithgenuvarumorvalgum