Background. Competitive sport Resting electrocardiogram may allow to select subjects with increased risk for sudden cardiac death. Aim of the study. 1. to analyze resting 12-leads electrocardiogram (ECG) according to Corrado criteria and features of left ventricle hypertrophy defined by Soko³ow-Lyon criterion in competitive athletes of different sports disciplines, 2. to assess whether athletes age and sex are related to the ECG abnormalities. Material and methodology. 48 competitive athletes were enrolled into the study (14 women, 27 men and 7 boys) - resting 12-leads ECG was analyzed. Results. Simultaneous appearance of 1 or 2 Corrado criteria was more frequent in young athletes [W-21,4%, M-25,9%, B-57,1%) vs (W-21,4%, M-14,8%, B-28,6%)]; the lack of criteria has more often been observed among adults (F-57,2%, M-59,3%, B-14,3%). The early repolarization syndrome has more often appeared at young athletes (85,7%); features of left ventricle hypertrophy according to the Soko³ow-Lyon criterion have more often been observed in men than in women (51,8% vs 6%). Changes in the electrocardiography have most often been observed at teenage footballers. Conclusions. ECG abnormalities in competitive athletes are quite often what seems to correlate with age and sex examined subjects.