Prevalence of abnormal and borderline electrocardiogram changes in 13, 079 Chinese amateur marathon runners

Abstract Background The 12-lead electrocardiogram (ECG) has been adopted as an important component of preparticipation cardiovascular screening. However, there are still controversies in the screening and few studies with a large sample size have reported results ECGs marathon runners. Therefore, purpose this study was to assess prevalence normal, borderline, abnormal ECG changes Methods data 13,079 amateur runners between ages 18 35 years were included for analysis. abnormalities among different gender groups compared chi-square tests. Results In terms training-related changes, sinus bradycardia, arrhythmia, left ventricular high voltage found approximately 15, 5, 3.28% participants, respectively. incidence right axis deviation 1.78%, which slightly higher than (0.88%). No more 0.1% exhibited ST-segment depression, T wave inversion (TWI), premature contraction, pathologic Q waves, prolonged QT interval. Conclusions Training-related including voltage, common Most TWI, interval, infrequently also suggested Chinese may relatively lower black white