The aim of this study is to determine the effect of regular and long term sports games and cyclical sports events exercises at the age of 11–14 for boys development in motor and sensomotor abilities and cardiovascular system adaptation peculiarities. The next methods were used: Tapping test, Roufier exercise test, vertical jump test, 30 s maximal jumping test, measurements of arterial blood pressure, electrocardiography (ECG), dynamometry, stabilography, measurements of body mass components, non linear ECG data analysis methods. Conclusions: 1. Motor and sensomotor abilities of non-athlete children develop in the age phase of 11–14: muscles’ power and capability, central nervous system (CNS) efficiency indices increase. The improvement of results is irregular: the rate of improvement decreases at the age of 13–14. 2. The increase in motor, sensomotor and cardiovascular system indices of cyclic sports events for children were indicated higher than in non-athlete contemporaries at the age of 11–13. Statistically significant differences of cardiovascular and most of CNS indices were not noticed at the age of 13–14 and muscles’ functional preparedness indices were significantly better than non-athletes. 3. The improvement of children, attending sports games trainings, functional preparedness indices are significantly greater than in non-athletes and cyclic sports events athletes at the age of 11–13. At the age of 13–14 the rate of indices reduce and except muscles preparedness... [to full text]