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Using spiroarteriocardiorhythmography, 202 highly qualified male athletes aged 22.6 ± 2.8 years, who are representatives of acyclic sports were examined. According to HRV (hearth rate variability), the types of the athletes' cardiac rhythm regulation were determined. There are 4 types of autonomic regulation of cardiac rhythm: Type I – indicates moderate stress, Type II – indicates a decrease in the functional state of regulatory systems, the development of fatigue, Type III – indicates the optimal state of regulation, Type IV – indicates overstrain of autonomic regulation or high fitness. The athletes with a predominance of central (types I and II) and autonomous (types III and IV) effects on the cardiac rhythm regulation are differentiated by indicators of total respiration power (TPR, (l/min)2) and power in the high frequency range (HFR), (l/min)2). Athletes with the type IV cardiac rhythm regulation had a more significant contribution of the low-frequency component (LFRn, n.u.) in the regulation of spontaneous respiration than athletes with type I and II cardiac rhythm regulation. In the type II regulation of cardiac rhythm there is a significant decrease in expiratory duration (s), which is also manifested by a significant increase in the ratio of inspiratory and expiratory phases, which may characterize expiratory insufficiency for this type.

Variability and Pattern of Spontaneous Respiration in Different Types of Cardiac Rhythm Regulation of Highly Trained Athletes