Isokinetic Strength, Bilateral and Unilateral Strength Differences: Variation by Age and Laterality in Elite Youth Football Players

SUMMARY: The purpose of this study was to investigate the effect of age on peak torque (PT) relative strength measures of knee extensors (KE) and knee flexors (KF), bilateral strength ratio (Q:Q, H:H), and ipsilateral strength ratio (H:Q) in youth elite male football players.Elite male players (n =...

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Autores principales:	Maly,Tomas, Ford,Kevin R, Sugimoto,Dai, Izovska,Jana, Bujnovsky,David, Hank,Mikulas, Cabell,Lee, Zahalka,Frantisek
Lenguaje:	English
Publicado:	Sociedad Chilena de Anatomía 2021
Materias:	Soccer Performance Strength asymmetries Injury prevention
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022021000100260
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spelling	oai:scielo:S0717-950220210001002602021-03-01Isokinetic Strength, Bilateral and Unilateral Strength Differences: Variation by Age and Laterality in Elite Youth Football PlayersMaly,TomasFord,Kevin RSugimoto,DaiIzovska,JanaBujnovsky,DavidHank,MikulasCabell,LeeZahalka,Frantisek Soccer Performance Strength asymmetries Injury prevention SUMMARY: The purpose of this study was to investigate the effect of age on peak torque (PT) relative strength measures of knee extensors (KE) and knee flexors (KF), bilateral strength ratio (Q:Q, H:H), and ipsilateral strength ratio (H:Q) in youth elite male football players.Elite male players (n = 70) from four age categories (U16: n = 20, U17: n = 20, U19: n = 15, U21: n = 15) performed isokinetic strength tests using a Cybex dynamometer. Results show a significant effect of age on PTKE (F3,142 = 4.54, p = 0.005, = 0.09) and PTKF (age: F3,142 = 3.07, p = 0.030, = 0.06). No significant effect of age on unilateral (F3,142 = 1.05, p = 0.375, = 0.02) or ipsilateral strength ratio (F3,142 = 2.63, p = 0.053, = 0.06) was found. Results revealed significant differences in PTKE for nondominant limbs between U16 and U21. Higher bilateral differences were detected for flexors (H:H = 7.94-11.47 %, Q:Q = 7.97-9.29 %) compared to extensors. Our study showed that 17-year-old players have levels of strength similar to U19 players. A higher bilateral difference of knee flexors than extensors was found, suggesting that more attention should be paid to knee flexors. No effect of laterality was found for strength and strength asymmetries. Future research should also focus on ipsilateral strength ratio in late stage of maturation.info:eu-repo/semantics/openAccessSociedad Chilena de AnatomíaInternational Journal of Morphology v.39 n.1 20212021-02-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022021000100260en10.4067/S0717-95022021000100260
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Soccer Performance Strength asymmetries Injury prevention
spellingShingle	Soccer Performance Strength asymmetries Injury prevention Maly,Tomas Ford,Kevin R Sugimoto,Dai Izovska,Jana Bujnovsky,David Hank,Mikulas Cabell,Lee Zahalka,Frantisek Isokinetic Strength, Bilateral and Unilateral Strength Differences: Variation by Age and Laterality in Elite Youth Football Players
description	SUMMARY: The purpose of this study was to investigate the effect of age on peak torque (PT) relative strength measures of knee extensors (KE) and knee flexors (KF), bilateral strength ratio (Q:Q, H:H), and ipsilateral strength ratio (H:Q) in youth elite male football players.Elite male players (n = 70) from four age categories (U16: n = 20, U17: n = 20, U19: n = 15, U21: n = 15) performed isokinetic strength tests using a Cybex dynamometer. Results show a significant effect of age on PTKE (F3,142 = 4.54, p = 0.005, = 0.09) and PTKF (age: F3,142 = 3.07, p = 0.030, = 0.06). No significant effect of age on unilateral (F3,142 = 1.05, p = 0.375, = 0.02) or ipsilateral strength ratio (F3,142 = 2.63, p = 0.053, = 0.06) was found. Results revealed significant differences in PTKE for nondominant limbs between U16 and U21. Higher bilateral differences were detected for flexors (H:H = 7.94-11.47 %, Q:Q = 7.97-9.29 %) compared to extensors. Our study showed that 17-year-old players have levels of strength similar to U19 players. A higher bilateral difference of knee flexors than extensors was found, suggesting that more attention should be paid to knee flexors. No effect of laterality was found for strength and strength asymmetries. Future research should also focus on ipsilateral strength ratio in late stage of maturation.
author	Maly,Tomas Ford,Kevin R Sugimoto,Dai Izovska,Jana Bujnovsky,David Hank,Mikulas Cabell,Lee Zahalka,Frantisek
author_facet	Maly,Tomas Ford,Kevin R Sugimoto,Dai Izovska,Jana Bujnovsky,David Hank,Mikulas Cabell,Lee Zahalka,Frantisek
author_sort	Maly,Tomas
title	Isokinetic Strength, Bilateral and Unilateral Strength Differences: Variation by Age and Laterality in Elite Youth Football Players
title_short	Isokinetic Strength, Bilateral and Unilateral Strength Differences: Variation by Age and Laterality in Elite Youth Football Players
title_full	Isokinetic Strength, Bilateral and Unilateral Strength Differences: Variation by Age and Laterality in Elite Youth Football Players
title_fullStr	Isokinetic Strength, Bilateral and Unilateral Strength Differences: Variation by Age and Laterality in Elite Youth Football Players
title_full_unstemmed	Isokinetic Strength, Bilateral and Unilateral Strength Differences: Variation by Age and Laterality in Elite Youth Football Players
title_sort	isokinetic strength, bilateral and unilateral strength differences: variation by age and laterality in elite youth football players
publisher	Sociedad Chilena de Anatomía
publishDate	2021
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022021000100260
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Isokinetic Strength, Bilateral and Unilateral Strength Differences: Variation by Age and Laterality in Elite Youth Football Players

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