Introduction: Bone strength is dependent on stimulation by skeletal muscles. To diagnose reduced bone strength and density in children and adolescents is therefore important not only to assess the physical and geometric parameters of bones using densitometric methods, but also to objectively assess parameters of muscle function. "Jumping mechanography" is one of the new techniques used for assessment of muscle force and power. The aim of the thesis was to create the gender-specific pediatric reference data on the main parameters of mechanography, muscle force (Fmax) and muscle power (Pmax). And to increase our knowledge of mechanography by defining relations between indicators mentioned above and basic anthropometrical parameters. Material and Methods: The study population included 796 healthy individuals (432 girls and 364 boys) aged 6-18 years. All probands were examined by a "single two-legged jump" and they were measured for their height and body mass. "Multiple one-legged hopping" was performed in a subgroup of 376 children. The participants were recruited from five primary schools and three high schools. Motoric tests were performed using a portable force platform ("Leonardo Mechanograph® GRFP", Novotec Medical GmbH, Pforzheim). LMS method was used to generate smooth centile curves for parameters...