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HEART RATE VARIABILITY IN ATHLETES OF ENDURANCE SPORTS

S. M. RAZINKIN (1), A. S. SAMOYLOV (1), P. A. FOMKIN (1), V. V. PETROVA (1), I. A. ARTAMONOVA (2), A. I. KRYNTSILOV (3), YU. N. SEMENOV (4), R. R. KLENKOV (5) 1 -BURNASYAN FEDERAL MEDICAL BIOPHYSICAL CENTER OF FEDERAL MEDICAL BIOLOGICAL AGENCY, MOSCOW, RUSSIA 2 -RUSSIAN STATE UNIVERSITY OF PHYSICAL EDUCATION, SPORT, YOUTH AND TOURISM (SCOLIPE), MOSCOW, RUSSIA 3 -FEDERAL RESEARCH AND CLINICAL CENTER OF SPORTS MEDICINE AND REHABILITATION OF FEDERAL MEDICAL BIOLOGICAL AGENCY, MOSCOW, RUSSIA 4 -INSTITUTE OF INTRODUCTION OF NEW MEDICAL TECHNOLOGIES «RAMENA» OPEN COMPANY, RYAZAN, RUSSIA 5 -STATE RESEARCH TEST INSTITUTE OF MILITARY MEDICINE, MOSCOW, RUSSIA

Objective: to clarify the quantitative evaluation of the heart rate variability (HRV) parameters, and to develop an approach, which will allow team physicians to determine athlete’s condition.
Materials and Methods: 83 professional athletes (team sports and endurance sports), 24 first class flight instructors, and 20 health individuals (control group). Evaluation of HRV parameters was performed with the electrocardiographic system «Varikard 2.51».
Results: the basic HRV parameters in the athletes group were significantly different from those in other groups: resting heart rate 68 BPM versus 78 BPM in flight instructors and 80 BPM in the control group; stress index of 84 c.u. versus 170 c.u. in flight instructors, and 471 c.u. in healthy people; centralization index of 2.92 c.u. versus 0.82 c.u. in flight instructors and 1.64 c.u. in the control group. Also there were significant differences in all basic HRV parameters between groups of athletes of different sports, and normative values for group of endurance sports.
Conclusions: the developed normative values of HRV parameters in the athletes of endurance sports could be used during interseasonal training period. The assessment of athletes’ peak performance before important competitions is necessary as it indicates their special functional state.
Keywords: 
athlete; heart rate variability; estimation scale; normative data; stress index; endurance sports.