Bilateral asymmetries and the performance profile in isokinetic knee assessment in young soccer players according to peak height velocity

The aim of the study was to compare isokinetic performance (PT) of knee extensors (ext) and flexors (flex), H:Q ratio, and PT asymmetry in young soccer players based on somatic maturation. 80 soccer players (aged 12-17) were sampled, classified as pre-PHV (n=19) and post-PHV (n=61). Isokinetic dynamometry assessed knee extensors/flexors at 60º/s. Pre-PHV had lower body mass/height than post-PHV (P < 0.001). Pre-PHV exhibited lower PT for dominant and non-dominant leg in ext and flex (P < 0.001). No differences in asymmetry (ext: 31.6% vs 31.1%; flex: 31.6% vs 34.4%) and H:Q ratio (dominant: 42.1% vs 32.8%; non-dominant: 26.3% vs 39.3%) between PHV groups, where asymmetry was considered >15%, and cutoff points for each limb H:Q were set at ≥60%. Study showed increased isokinetic performance according to PHV, but no effect on asymmetries and H:Q ratio.