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Isokinetic strength of lower limbs and its differences depending on gender, muscle group and angular velocity in children

Publication at First Faculty of Medicine, Faculty of Physical Education and Sport |
2014

Abstract

The goal of this chapter was to identify muscle strength of knee extensors (KE) and flexors (KF) in non-sporting primary school population and compare results in terms of intersexual differences, muscle group and speed of muscle contraction.The monitoring was carried out with fifty-seven 13 years old children without regular sport activity (Boys: n = 31, height = 158.5+-8.0 cm, weight = 53.0+-12.6 kg, Girls: n=26, height = 158.6+-6.3 cm, weight = 50.7+-11.5 kg. Peak torque (PT) of knee flexors and extensors on the dominant leg was measured on the isokinetic dynamometer Cybex Humac Norm.Gender did not influence the PT of thigh muscles (p>0.05, ηp2 = 0.002).

KE produced significantly higher PT in comparison to KF (p<0.01, ηp2 = 0.644). At the lowest velocity, boys produced lower PT than girls (Boys: 2.13+-0.48 N.m.kg-1; Girls: 2.31+-0.42 N.m.kg-1).

On the other hand, at the highest velocity, boys achieved better performance than girls by 5.1% (Boys: 1.17+-0.29 N.m.kg-1; Girls: 1.11+-0.26 N.m.kg-1).he study did not show significant differences in the level of PT in KE and KF between boys and girls in 13 year old non-sporting population normalized to participant's body weight. Girls achieved higher values of PT at lower velocities while boys at higher velocities.

Speed of muscle contraction had a significant effect on the level of strength.