Cargando…

Are isokinetic leg torques and kick velocity reliable predictors of competitive level in taekwondo athletes?

The aim of this study is to analyze how isokinetic knee and hip peak torques and roundhouse kick velocities are related to expertise level (elite vs. sub-elite) in taekwondo athletes. Seven elite and seven sub-elite athletes were tested for kick-specific variables (KSV, composed of kinematic variabl...

Descripción completa

Detalles Bibliográficos
Autores principales: Moreira, Pedro Vieira Sarmet, Falco, Coral, Menegaldo, Luciano Luporini, Goethel, Márcio Fagundes, de Paula, Leandro Vinhas, Gonçalves, Mauro
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8189470/
https://www.ncbi.nlm.nih.gov/pubmed/34106936
http://dx.doi.org/10.1371/journal.pone.0235582
_version_ 1783705502238113792
author Moreira, Pedro Vieira Sarmet
Falco, Coral
Menegaldo, Luciano Luporini
Goethel, Márcio Fagundes
de Paula, Leandro Vinhas
Gonçalves, Mauro
author_facet Moreira, Pedro Vieira Sarmet
Falco, Coral
Menegaldo, Luciano Luporini
Goethel, Márcio Fagundes
de Paula, Leandro Vinhas
Gonçalves, Mauro
author_sort Moreira, Pedro Vieira Sarmet
collection PubMed
description The aim of this study is to analyze how isokinetic knee and hip peak torques and roundhouse kick velocities are related to expertise level (elite vs. sub-elite) in taekwondo athletes. Seven elite and seven sub-elite athletes were tested for kick-specific variables (KSV, composed of kinematic variables and power of impact) and for concentric isokinetic peak torque (PT) at 60°/s and 240°/s. First, KSVs and PTs were compared between groups, then PTs were correlated with KSVs. Parametric variables with larger effect sizes (Cohen’s d) were entered in a stepwise linear discriminant analysis (LDA), generating an equation to estimate competitive level. Between-group differences were found in hip flexors (p = 0.04, d = 0.92) and extensors (p = 0.04, d = 0.96) with PT at 240°/s. Hip flexion PT at 60°/s and 240°/s correlated negatively with kick time (R = –0.46, p = 0.0499 and R = –0.62, p = 0.01 respectively). Hip flexion torque at 60°/s correlated positively (R = 0.52, p = 0.03) with peak linear velocity of the foot (LVF) and power of impact (R = 0.51, p = 0.03). Peak torque of hip extension at 60°/s and hip abduction at 240°/s also correlated with LVF (R = 0.56, p = 0.02 and R = 0.46, p = 0.0499). Hip extension at 60°/s correlated positively with peak linear velocity of the knee (R = 0.48, p = 0.04). The LDA showed an accuracy of 85.7% (p = 0.003) in predicting expertise level based on hip flexion and extension torques at 240°/s and on knee extension velocity during the kick. The study demonstrates that hip muscle strength is probably the dominant muscular factor for determining kick performance. Knee angular velocity combined with hip torques is the best discriminator for competitive level in taekwondo athletes.
format Online
Article
Text
id pubmed-8189470
institution National Center for Biotechnology Information
language English
publishDate 2021
publisher Public Library of Science
record_format MEDLINE/PubMed
spelling pubmed-81894702021-06-16 Are isokinetic leg torques and kick velocity reliable predictors of competitive level in taekwondo athletes? Moreira, Pedro Vieira Sarmet Falco, Coral Menegaldo, Luciano Luporini Goethel, Márcio Fagundes de Paula, Leandro Vinhas Gonçalves, Mauro PLoS One Research Article The aim of this study is to analyze how isokinetic knee and hip peak torques and roundhouse kick velocities are related to expertise level (elite vs. sub-elite) in taekwondo athletes. Seven elite and seven sub-elite athletes were tested for kick-specific variables (KSV, composed of kinematic variables and power of impact) and for concentric isokinetic peak torque (PT) at 60°/s and 240°/s. First, KSVs and PTs were compared between groups, then PTs were correlated with KSVs. Parametric variables with larger effect sizes (Cohen’s d) were entered in a stepwise linear discriminant analysis (LDA), generating an equation to estimate competitive level. Between-group differences were found in hip flexors (p = 0.04, d = 0.92) and extensors (p = 0.04, d = 0.96) with PT at 240°/s. Hip flexion PT at 60°/s and 240°/s correlated negatively with kick time (R = –0.46, p = 0.0499 and R = –0.62, p = 0.01 respectively). Hip flexion torque at 60°/s correlated positively (R = 0.52, p = 0.03) with peak linear velocity of the foot (LVF) and power of impact (R = 0.51, p = 0.03). Peak torque of hip extension at 60°/s and hip abduction at 240°/s also correlated with LVF (R = 0.56, p = 0.02 and R = 0.46, p = 0.0499). Hip extension at 60°/s correlated positively with peak linear velocity of the knee (R = 0.48, p = 0.04). The LDA showed an accuracy of 85.7% (p = 0.003) in predicting expertise level based on hip flexion and extension torques at 240°/s and on knee extension velocity during the kick. The study demonstrates that hip muscle strength is probably the dominant muscular factor for determining kick performance. Knee angular velocity combined with hip torques is the best discriminator for competitive level in taekwondo athletes. Public Library of Science 2021-06-09 /pmc/articles/PMC8189470/ /pubmed/34106936 http://dx.doi.org/10.1371/journal.pone.0235582 Text en © 2021 Moreira et al https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Moreira, Pedro Vieira Sarmet
Falco, Coral
Menegaldo, Luciano Luporini
Goethel, Márcio Fagundes
de Paula, Leandro Vinhas
Gonçalves, Mauro
Are isokinetic leg torques and kick velocity reliable predictors of competitive level in taekwondo athletes?
title Are isokinetic leg torques and kick velocity reliable predictors of competitive level in taekwondo athletes?
title_full Are isokinetic leg torques and kick velocity reliable predictors of competitive level in taekwondo athletes?
title_fullStr Are isokinetic leg torques and kick velocity reliable predictors of competitive level in taekwondo athletes?
title_full_unstemmed Are isokinetic leg torques and kick velocity reliable predictors of competitive level in taekwondo athletes?
title_short Are isokinetic leg torques and kick velocity reliable predictors of competitive level in taekwondo athletes?
title_sort are isokinetic leg torques and kick velocity reliable predictors of competitive level in taekwondo athletes?
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8189470/
https://www.ncbi.nlm.nih.gov/pubmed/34106936
http://dx.doi.org/10.1371/journal.pone.0235582
work_keys_str_mv AT moreirapedrovieirasarmet areisokineticlegtorquesandkickvelocityreliablepredictorsofcompetitivelevelintaekwondoathletes
AT falcocoral areisokineticlegtorquesandkickvelocityreliablepredictorsofcompetitivelevelintaekwondoathletes
AT menegaldolucianoluporini areisokineticlegtorquesandkickvelocityreliablepredictorsofcompetitivelevelintaekwondoathletes
AT goethelmarciofagundes areisokineticlegtorquesandkickvelocityreliablepredictorsofcompetitivelevelintaekwondoathletes
AT depaulaleandrovinhas areisokineticlegtorquesandkickvelocityreliablepredictorsofcompetitivelevelintaekwondoathletes
AT goncalvesmauro areisokineticlegtorquesandkickvelocityreliablepredictorsofcompetitivelevelintaekwondoathletes