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FEATURES OF ELECTROCARDIOGRAM AND ELECTROMYOGRAM AT THE TIME OF TERMINATION OF INTENSE PHYSICAL WORK IN NON-ELITE RUNNERS

N. A. FUDIN (1), S. YA. KLASSINA (1), S. N. PIGAREVA (1), YU. YE. VAGUINЕ (2) 1 -ANOKHIN INSTITUTE OF NORMAL PHYSIOLOGY, MOSCOW, RUSSIA 2 -SECHENOV FIRST MOSCOW STATE MEDICAL UNIVERSITY, MOSCOW, RUSSIA

Objective: to investigate the features of electrocardiogram (ECG) and electromyogram (EMG) at the time of termination of intense physical work.
Materials and Methods: 25 volunteers performed an increasing physical work test to refusal on an ergocycle at a constant speed of pedals rotation. The initial power load was 60 W. The load increased every 1 min on 20 W up to 140 W. The performance time under the maximal load was not limited. The recovery was investigated during 6 min after termination of test. ECG was registered at standard lead I and thorax lead V5. EMG was recorded from the muscles of the right thigh.
Results: sympathetic influence on the heart rate and hemodynamic parameters increased at the moment of termination of physical activity. The value of the P, Q, T waves and the QRS segment on the ECG exceeded normal levels. EMG showed a trend of reducing number of turns and average amplitude, which indicated the development of muscle fatigue. All subjects had pulmonary dyspnea, increased heart rate and fatigue in the leg muscles. Investigated parameters returned to a normal level after 6 min of recovery.
Conclusions: the results of the study allowed to determine some predictors of the physical activity limit: the submaximal heart rate; the increase of the level of circulatory minute volume by 2-3 times, and increased amplitudes of the P, Q, T waves and the QRS segment on the ECG. Those ECG changes are functional and disappear after recovery.
Keywords: 
sports; physical exercise intensity; physical endurance.