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...

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Autores principales:	Pedro Vieira Sarmet Moreira, Coral Falco, Luciano Luporini Menegaldo, Márcio Fagundes Goethel, Leandro Vinhas de Paula, Mauro Gonçalves
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/58b840852ff3439ca283e7e2ae247ac6
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spelling	oai:doaj.org-article:58b840852ff3439ca283e7e2ae247ac62021-12-02T20:10:56ZAre isokinetic leg torques and kick velocity reliable predictors of competitive level in taekwondo athletes?1932-620310.1371/journal.pone.0235582https://doaj.org/article/58b840852ff3439ca283e7e2ae247ac62021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0235582https://doaj.org/toc/1932-6203The 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.Pedro Vieira Sarmet MoreiraCoral FalcoLuciano Luporini MenegaldoMárcio Fagundes GoethelLeandro Vinhas de PaulaMauro GonçalvesPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 6, p e0235582 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Pedro Vieira Sarmet Moreira Coral Falco Luciano Luporini Menegaldo Márcio Fagundes Goethel Leandro Vinhas de Paula Mauro Gonçalves Are isokinetic leg torques and kick velocity reliable predictors of competitive level in taekwondo athletes?
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	article
author	Pedro Vieira Sarmet Moreira Coral Falco Luciano Luporini Menegaldo Márcio Fagundes Goethel Leandro Vinhas de Paula Mauro Gonçalves
author_facet	Pedro Vieira Sarmet Moreira Coral Falco Luciano Luporini Menegaldo Márcio Fagundes Goethel Leandro Vinhas de Paula Mauro Gonçalves
author_sort	Pedro Vieira Sarmet Moreira
title	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_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_sort	are isokinetic leg torques and kick velocity reliable predictors of competitive level in taekwondo athletes?
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/58b840852ff3439ca283e7e2ae247ac6
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Are isokinetic leg torques and kick velocity reliable predictors of competitive level in taekwondo athletes?

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