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DYNAMIC RESEARCH OF HEART RATE VARIABILITY AND ELECTROCARDIOGRAM DISPERSION MAPPING IN WEIGHTLIFTERS OF VARIOUS FITNESS LEVELS

YU. A. MATVEEV, D. N. CHERNO GOROV MOSCOW CITY TEACHER TRAINING UNIVERSITY, MOSCOW, RUSSIA

Objective: monitoring of variability of the ECG T-wave in weightlifters under the influence of physical exercises.
Materials and Methods: ECG in weightlifters (n=48) was assessed in the beginners, the advanced, and the elite groups with the diagnostic Kardiovizor-06C system.
Results: the statistically significant decrease in the heart rate variability was registered: «the average duration of RR interval» decreased by 16,1% in the advanced group, and by 19,5% in the elite group (р<0,01); «the average standard deviation of RR interval» decreased by 18,6% in the beginners group and by 49,4% in the advanced and the elite groups (р<0,01); «the variation parameter»: decreased by 21,87% in the beginners group, by 35,0% in the advanced group, and 39,27% in the elite group (р<0,01).
Conclusions: the observed decrease in the heart rate variability and other deviations of dispersion characteristics showed a rigidity of adaptation mechanisms and the functional reserves of myocardium mainly in the group of the elite weightlifters. That could increase a probable risk of development of arrhythmias in this poupation.
Keywords: 
weightlifters; cardiovascular system; heart rate variability; myocardium; sports heart.