摘要：The purpose was to compare knee extensors and flexors’ strength in sedentary children and detect itsdifferences with respect to gender and lower limb dominancy. It was hypothesized that the non-preferred legwould have lower knee extensors and flexors’ strength and there will be a higher incidence of bilateral andunilateral strength deficit. The group of untrained children (boys: n = 20, age = 14.5±0.2 years, height=171.1±5.3cm, weight = 60.4±20.3 cm, girls: n = 18, age = 11.6±0.4 years, height =163.5±5.0 cm,weight = 55.2±8.9 cm) was tested on the Cybex isokinetic dynamometer at 60 °.s-1 for the dominant (DL)and non-dominant leg (NL) in concentric contraction. Univariate ANOVA (2x2) with two between subjecteffects (gender (G), laterality (L)) was used for evaluation of peak torque (PT) differences between thefactors for extensors or flexors. Strength of knee extensors (PTE) and flexors (PTF) was significantly differentdepending on gender (PTE: F1,76 = 23.92, p<.01, ηp2 = .25; PTF: F1,76 = 17.81 p<.01, ηp2 = .20). Limbdominance had an insignificant effect on the level of both PTE (F1,76 = 0.94, p>.05, ηp2= .01) and PTF (F1,76= 0.48, p>.05, ηp2 = .01). The interaction effect between velocity and gender was insignificant (p>.05).Bilateral strength deficit between the limbs (Q:Q) was 7.27 % in boys and 1.78 % in girls. Concerning kneeflexors, the bilateral deficit in boys was 5.39 % while in girls it was 3.41 %. The unilateral ratio (H:Q) in boyswas 50.28 % (DL) and 51.31 % (NL). The girls achieved a lower unilateral ratio in comparison to the boys(49.74 % - DL and 48.92 % - NL). The PTE and PTFwas significantly different depending on G in 15-year-oldparticipants. Limb dominancy did not significantly influence isokinetic strength of knee extensors and flexors.The bilateral strength deficit between the limbs was < 10%in both groups.The unilateral ratio (H:Q) ratio washigher in boys than in girls. Early identification of muscle imbalances and their compensation using verifiedintervention procedures should be a part of movement intervention at schools, sports clubs and free timeactivities in youth age with the aim of early elimination of the detected maladaptive effects.
