Abstract
Parameters of heart rate variability, pulmonary ventilation, and gas exchange in the VLF range were studied in 11 healthy subjects (5 men, 6 women) aged from 22 to 59 years. Data on oxygen consumption, carbon dioxide production, breathing rate, tidal volume, R-R intervals of electrocardiogram were recorded in the first half of the day in the sitting position in a state of relative rest. To process the frequency properties, the fast Fourier transform method was used (window of 2048 samples, weighting function - Hamming). It is shown that during the 60-minute monitoring there is a functionally significant dynamics of all measured parameters in the VLF-range with the coincidence of the integral maxima of the spectral power of the heart rate, the parameters of gas exchange and ventilation in the range from 0.003 to 0.02 Hz. The coincidence of frequency characteristics with periodic dynamics within 1-5 minutes allows us to conclude that the quasi-periodic oscillations are stable and formed as a result of the interaction of the controlling mechanisms of cardiorespiratory rhythmogenesis.
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