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RELATIONSHIPS OF ELECTROMYORGAM AND ELECTROCARDIOGRAM INDICATORS IN PEOPLE DOING GRADED PHYSICAL EXERCISE AND SPORTS

N. A. FUDIN, S. YA. KLASSINA, S. N. PIGAREVA P. K. ANOKHIN RESEARCH INSTITUTE OF NORMAL PHYSIOLOGY, MOSCOW, RUSSIA
The purpose of research – analysis of the relationship between electromyography (EMG) and electrocardiography (ECG) indicators by persons engaged in physical culture and sports, with step-dosed physical load on the cycle ergometer.
Materials and Methods: 16 male-volunteers took part in inspection. It was offers to everybody to fulfill the increasing intensity of phasing-dosed physical load on the cycle ergometer. The first step of load was 60 W, and powers of the subsequent steps of load were consistently increasing with a 20 W increments to a test became failure. The duration of any step loading was 2 minutes. The load testing was conducting with the constant pedaling rate. When the physical work on any proposed steps was finishing, the 6-minute recovery was following. EMG (muscle of the right hip) and ECG (I standard abduction and V5-abduction) were registering on all steps of load.
Results: The analysis of EMG- and ECG- indicator's dynamics was revealing that they are rise with increasing of load power. 100 W is the critical load power when cardiovascular and muscular systems are beginning to reorganization. If at low intensities of physical activity (60–100 W) the insurance of due muscular effort demands only increase of a heart rhythm, then at high intensity of physical activity (120 W and more) electrophysiological processes of a myocardium are involved for ensuring muscular effort, and it leads to compensatory changes in ECG.
Conclusions: Degree of interrelation of muscular and cardiovascular systems indicators is rising as the intensity of physical activity is increasing.
Keywords: 
sports, physical culture, the intensity of exercise, muscle force, electromyogram, electrocardiogram, teeth and segments of the electro-cardiogram, the relationship indicators muscular and cardiovascular systems.