Isokinetic Strength, Bilateral and Unilateral Strength Differences: Variation by Age and Laterality in Elite Youth Football Players /Fuerza Isocinética, Diferencias de Fuerza Bilaterales y Unilaterales: Variación por Edad y Lateralidad en Futbolistas Juveniles de Élite

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...

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Published inInternational journal of morphology Vol. 39; no. 1; p. 260
Main Authors Maly, Tomas, Ford, Kevin R, Sugimoto, Dai, Izovska, Jana, Bujnovsky, David, Hank, Mikulas, Cabell, Lee, Zahalka, Frantisek
Format Journal Article
LanguageEnglish
Published Universidad de La Frontera, Facultad de Medicina 01.01.2021
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República Checa
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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. KEY WORDS: Soccer; Performance; Strength asymmetries; Injury prevention.
ISSN:0717-9367
0717-9502