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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...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Public Library of Science
2021
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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 |
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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 |
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