An increased systolic blood pressure (SBP) in adolescents is associated with overweight, increase os systolic blood pressure variability in frequency range 0.1 Hz and decrease of baroreflex sensitivity (BRS). In group vith low BRS, dampening effect of BRS on SBP variability is insuficient in both, hypertensives and control. In group with medium level of BRS hypertensives had significantly higher SBP variability. This could be a sign of increased sympathtic vasomotoric activity.