Pennation angle of vastus laterallis during isometric contractions performed at two knee angles
Abstract Introduction: The pennation angle (PA) of a muscle is not static value, but it adapts to the conditions imposed by the contraction intensity required. Objective: This study investigates the effect of knee angle (KA) and intensity of contraction (IC) on PA of vastus lateralis (VL). Meth...
Main Authors: | , , |
---|---|
Format: | Article |
Language: | English |
Published: |
Editora Champagnat
|
Series: | Fisioterapia em Movimento |
Subjects: | |
Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-51502017000500075&lng=en&tlng=en |
id |
doaj-8aab535007d0428da8651df0b31f4332 |
---|---|
record_format |
Article |
spelling |
doaj-8aab535007d0428da8651df0b31f43322020-11-25T02:38:15ZengEditora Champagnat Fisioterapia em Movimento1980-591830suppl 1758310.1590/1980-5918.030.s01.ao07S0103-51502017000500075Pennation angle of vastus laterallis during isometric contractions performed at two knee anglesFelipe Torres Miranda de OliveiraCarlos Gomes de OliveiraPaulo FarinattiAbstract Introduction: The pennation angle (PA) of a muscle is not static value, but it adapts to the conditions imposed by the contraction intensity required. Objective: This study investigates the effect of knee angle (KA) and intensity of contraction (IC) on PA of vastus lateralis (VL). Methods: Eight women and nine men executed isometric torques lasting 5s at the maximal voluntary contraction (MVC), 25%, 50% and 75% of MVC, on an isokinetic dynamometer with the KA at 90° and 120° (full extension = 180°). The PA was measured in each test, and with the subject relaxed. The effect of IC on PA was tested by means of repeated measures ANOVA and effect size (ES), and of the KA on PA by paired t test, employed on each IC, together with the statistics: intraclass correlation (ICC), standard error of measurement (SEM) and ES, all calculated with the PAs measured at both KAs. Results: The PA increased significantly and successively with the IC (p < 0.05; ES between 1.11 and 3.04), but was not influenced by KA (p > 0.05; ICC between 0.70 and 0.81; SEM between 0.7° and 1.4°; ES between 0.02 and 0.2). Conclusion: The successive increase of PA with the IC supports the existence of relation between these variables. While studies advocate the effect of PA on joint angle this was not observed in this study, probable because the 30o of between KA difference employed was not enough to provide change in PA.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-51502017000500075&lng=en&tlng=enÂnguloArticulação do JoelhoTorqueVasto Lateral. |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Felipe Torres Miranda de Oliveira Carlos Gomes de Oliveira Paulo Farinatti |
spellingShingle |
Felipe Torres Miranda de Oliveira Carlos Gomes de Oliveira Paulo Farinatti Pennation angle of vastus laterallis during isometric contractions performed at two knee angles Fisioterapia em Movimento Ângulo Articulação do Joelho Torque Vasto Lateral. |
author_facet |
Felipe Torres Miranda de Oliveira Carlos Gomes de Oliveira Paulo Farinatti |
author_sort |
Felipe Torres Miranda de Oliveira |
title |
Pennation angle of vastus laterallis during isometric contractions performed at two knee angles |
title_short |
Pennation angle of vastus laterallis during isometric contractions performed at two knee angles |
title_full |
Pennation angle of vastus laterallis during isometric contractions performed at two knee angles |
title_fullStr |
Pennation angle of vastus laterallis during isometric contractions performed at two knee angles |
title_full_unstemmed |
Pennation angle of vastus laterallis during isometric contractions performed at two knee angles |
title_sort |
pennation angle of vastus laterallis during isometric contractions performed at two knee angles |
publisher |
Editora Champagnat |
series |
Fisioterapia em Movimento |
issn |
1980-5918 |
description |
Abstract Introduction: The pennation angle (PA) of a muscle is not static value, but it adapts to the conditions imposed by the contraction intensity required. Objective: This study investigates the effect of knee angle (KA) and intensity of contraction (IC) on PA of vastus lateralis (VL). Methods: Eight women and nine men executed isometric torques lasting 5s at the maximal voluntary contraction (MVC), 25%, 50% and 75% of MVC, on an isokinetic dynamometer with the KA at 90° and 120° (full extension = 180°). The PA was measured in each test, and with the subject relaxed. The effect of IC on PA was tested by means of repeated measures ANOVA and effect size (ES), and of the KA on PA by paired t test, employed on each IC, together with the statistics: intraclass correlation (ICC), standard error of measurement (SEM) and ES, all calculated with the PAs measured at both KAs. Results: The PA increased significantly and successively with the IC (p < 0.05; ES between 1.11 and 3.04), but was not influenced by KA (p > 0.05; ICC between 0.70 and 0.81; SEM between 0.7° and 1.4°; ES between 0.02 and 0.2). Conclusion: The successive increase of PA with the IC supports the existence of relation between these variables. While studies advocate the effect of PA on joint angle this was not observed in this study, probable because the 30o of between KA difference employed was not enough to provide change in PA. |
topic |
Ângulo Articulação do Joelho Torque Vasto Lateral. |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-51502017000500075&lng=en&tlng=en |
work_keys_str_mv |
AT felipetorresmirandadeoliveira pennationangleofvastuslaterallisduringisometriccontractionsperformedattwokneeangles AT carlosgomesdeoliveira pennationangleofvastuslaterallisduringisometriccontractionsperformedattwokneeangles AT paulofarinatti pennationangleofvastuslaterallisduringisometriccontractionsperformedattwokneeangles |
_version_ |
1724791913209397248 |