The effect of physical activity on electrophysiological processes in the ventricular myocardium in child-athletes

Abstract

Maladaptation processes in the cardiovascular system in child athletes are associated with changes in electrophysiological processes in the myocardium. To identify risk groups for the development of the cardiovascular system pathology among this contingent, it is possible to use a non-invasive technique: ECG dispersion mapping.Purpose. To identify changes in electrophysiological processes in the myocardium of the left and right ventricles in child athletes in response to physical activity.Material and methods. 279 healthy children without chronic disease aged from 12 to 18 years were under observation. A group of 209 children involved in sports has been identified. The gender distribution is as follows: 153 boys (73%) and 56 girls (27%). The reference group included 70 children not involved in sports. All child athletes had access to the training and competition process. Within the study group, 4 subgroups were allocated in accordance with sports: A subgroup — children attending the football section (51 boys); B — basketball (37 boys and 22 girls); C — volleyball (29 boys and 27 girls); D — martial arts (36 boys and 7 girls). All children underwent dispersion mapping of the electrocardiogram using the Cardiovisor software and hardware complex before and after the exercise test. The processes of depolarization and repolarization in the myocardium of the left and right ventricles were analyzed on the basis of G3–G6 indices. Statistical processing of the results was carried out using MS Excel, Stata.Results. The analysis of electrophysiological processes in the myocardium of the left and right ventricles in child athletes showed statistically significant differences in comparison with the reference group. In all G3-G6 indicators in the main group, a moderate deviation was noted, while all values in the reference group were within normal limits in more than 92%. Moderate physical exertion led to the registration of both moderate and pronounced electrophysiological disturbances in the myocardium, especially in children engaged in highly dynamic sports, namely basketball.