Abstrakt
The aim of the study was to determine the profile of isokinetic strength of elite young soccer players and to determine the ratio of muscle strength between knee extensors, flexors and their unilateral strength imbalances.Twenty five soccer players of U16 national team (mean age 15.6+-0.2 years, body height 177.4+-6.8 cm and body weight 67.0+-7.7 kg) participated in this study. Assessment was performed on the isokinetic dynamometer Cybex Humac Norm.Significant differences were found between PT of extensors at 240 and 300 o/s and flexors at the lowest velocity (p{0.05).
H:Q ratio between legs at 240 o/s was significantly different (p{0.05). With increasing angular velocity, statistical differences in QD:QN (F4,96 = 0.310; p}0.05) respectively HD:HN ratio (F4,96 = 0.133; p}0.05) were not revealed.
However HD:QD or HN:QN, respectively, significantly changed during increasing velocity (F4,96 = 7.588; p{0.05 or F4,96 = 4.991; p{0.05). HD:HQ at the lowest velocity was significant when compared to each other velocity (p{0.05).
HN:QN at 60o/s was different in comparison to HN:HQ at 120 or 300o/s, respectively.The level of muscle strength declined with increasing velocity in both preferred and non-preferred lower extremities.