Bilateral Strength Asymmetry in Elite Youth Soccer Players: Differences between Age Categories

The strength asymmetry of athletes as a negative health and performance factor is increasingly being researched in sports with a high load on the dominant limb when some specific unilateral movements, such as passing, jumping, and tackling, are required. This study aimed to determine the level of is...

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Autores principales:	Maros Kalata, Mikulas Hank, David Bujnovsky, Jakub Michalek, Matej Varjan, Egon Kunzmann, Frantisek Zahalka, Tomas Maly
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	isokinetic asymmetry knee extensors knee flexors maturation youth soccer Mathematics QA1-939
Acceso en línea:	https://doaj.org/article/7feafa299c7e4e9584e514c6782f5bf7
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spelling	oai:doaj.org-article:7feafa299c7e4e9584e514c6782f5bf72021-11-25T19:05:45ZBilateral Strength Asymmetry in Elite Youth Soccer Players: Differences between Age Categories10.3390/sym131119822073-8994https://doaj.org/article/7feafa299c7e4e9584e514c6782f5bf72021-10-01T00:00:00Zhttps://www.mdpi.com/2073-8994/13/11/1982https://doaj.org/toc/2073-8994The strength asymmetry of athletes as a negative health and performance factor is increasingly being researched in sports with a high load on the dominant limb when some specific unilateral movements, such as passing, jumping, and tackling, are required. This study aimed to determine the level of isokinetic strength bilateral asymmetry (BA) among knee extensors (KEs) and knee flexors (KFs) of elite youth soccer players. The sample (<i>n</i> = 87) consisted of three age categories of under 13 (U13), under 15 (U15), and under 17 (U17) years old. Isokinetic dynamometry was used to obtain the maximum peak torque of the KEs and KFs in the dominant and non-dominant lower limbs during concentric muscle contraction. The analysis revealed significantly lower values (<i>p</i> < 0.05) of BA in KEs in U17 than in younger categories, U13 and U15, and higher values (<i>p</i> < 0.05) of BA in KFs in the U15 category than in the U17category. The majority of the players in the U15 category (68%) reached KFs BA higher than 10% in comparison with U13 players (50%) and U17 players (28% of players) (<i>p</i> < 0.05). Our results showed a significant effect of age category on BA levels in young soccer players. High incidences of increased BA in the lower limbs occurred in the younger categories (U13, U15) and subsequently decreased in the later adolescent stages.Maros KalataMikulas HankDavid BujnovskyJakub MichalekMatej VarjanEgon KunzmannFrantisek ZahalkaTomas MalyMDPI AGarticleisokinetic asymmetryknee extensorsknee flexorsmaturationyouth soccerMathematicsQA1-939ENSymmetry, Vol 13, Iss 1982, p 1982 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	isokinetic asymmetry knee extensors knee flexors maturation youth soccer Mathematics QA1-939
spellingShingle	isokinetic asymmetry knee extensors knee flexors maturation youth soccer Mathematics QA1-939 Maros Kalata Mikulas Hank David Bujnovsky Jakub Michalek Matej Varjan Egon Kunzmann Frantisek Zahalka Tomas Maly Bilateral Strength Asymmetry in Elite Youth Soccer Players: Differences between Age Categories
description	The strength asymmetry of athletes as a negative health and performance factor is increasingly being researched in sports with a high load on the dominant limb when some specific unilateral movements, such as passing, jumping, and tackling, are required. This study aimed to determine the level of isokinetic strength bilateral asymmetry (BA) among knee extensors (KEs) and knee flexors (KFs) of elite youth soccer players. The sample (<i>n</i> = 87) consisted of three age categories of under 13 (U13), under 15 (U15), and under 17 (U17) years old. Isokinetic dynamometry was used to obtain the maximum peak torque of the KEs and KFs in the dominant and non-dominant lower limbs during concentric muscle contraction. The analysis revealed significantly lower values (<i>p</i> < 0.05) of BA in KEs in U17 than in younger categories, U13 and U15, and higher values (<i>p</i> < 0.05) of BA in KFs in the U15 category than in the U17category. The majority of the players in the U15 category (68%) reached KFs BA higher than 10% in comparison with U13 players (50%) and U17 players (28% of players) (<i>p</i> < 0.05). Our results showed a significant effect of age category on BA levels in young soccer players. High incidences of increased BA in the lower limbs occurred in the younger categories (U13, U15) and subsequently decreased in the later adolescent stages.
format	article
author	Maros Kalata Mikulas Hank David Bujnovsky Jakub Michalek Matej Varjan Egon Kunzmann Frantisek Zahalka Tomas Maly
author_facet	Maros Kalata Mikulas Hank David Bujnovsky Jakub Michalek Matej Varjan Egon Kunzmann Frantisek Zahalka Tomas Maly
author_sort	Maros Kalata
title	Bilateral Strength Asymmetry in Elite Youth Soccer Players: Differences between Age Categories
title_short	Bilateral Strength Asymmetry in Elite Youth Soccer Players: Differences between Age Categories
title_full	Bilateral Strength Asymmetry in Elite Youth Soccer Players: Differences between Age Categories
title_fullStr	Bilateral Strength Asymmetry in Elite Youth Soccer Players: Differences between Age Categories
title_full_unstemmed	Bilateral Strength Asymmetry in Elite Youth Soccer Players: Differences between Age Categories
title_sort	bilateral strength asymmetry in elite youth soccer players: differences between age categories
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/7feafa299c7e4e9584e514c6782f5bf7
work_keys_str_mv	AT maroskalata bilateralstrengthasymmetryineliteyouthsoccerplayersdifferencesbetweenagecategories AT mikulashank bilateralstrengthasymmetryineliteyouthsoccerplayersdifferencesbetweenagecategories AT davidbujnovsky bilateralstrengthasymmetryineliteyouthsoccerplayersdifferencesbetweenagecategories AT jakubmichalek bilateralstrengthasymmetryineliteyouthsoccerplayersdifferencesbetweenagecategories AT matejvarjan bilateralstrengthasymmetryineliteyouthsoccerplayersdifferencesbetweenagecategories AT egonkunzmann bilateralstrengthasymmetryineliteyouthsoccerplayersdifferencesbetweenagecategories AT frantisekzahalka bilateralstrengthasymmetryineliteyouthsoccerplayersdifferencesbetweenagecategories AT tomasmaly bilateralstrengthasymmetryineliteyouthsoccerplayersdifferencesbetweenagecategories
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Bilateral Strength Asymmetry in Elite Youth Soccer Players: Differences between Age Categories

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