The study makes an attempt at assessing changes of bone density and somatic traits in soccer players who had been training for a period of 5 or 6 years. The examination was repeated one year later. The analysed somatic structure indexes indicated mean values increase of body mass by 3.24 kg, height by 2.62 cm and adipose tissue by 0.88%. The following changes were observed: Stiffness index increased from 109.7±18.1 to 113.2±16.9%, BUA parameter from 117.9±14.6 to 123.6±14.2 dB/MHz; while SOS index remained the same 1612 m/s. Reports show that athletes involved in highly competitive sports and individuals who exercise regularly manifest higher bone mass density than those who are inactive (Jergas et al. 1992, Nordstrom et al. 1998). Body weight and pubertal status and activity were significantly correlated with bone stiffness (Cvijetic et al. 2003). The development rate of somatic traits and bone mass density in the examined soccer players was not identical. The greatest increase was observed in the following parameters: Stiffness index, trabecular bone structure (BUA) and LBM. We can assume that boys with the increased bone mass density (Stiffness = 130-150%) achieved it in the first years of training.
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