Abstract
Continuous wavelet analysis can be used to quantitatively describe local changes in cardiac rhythm oscillations. The following new indices of the wave structure of the cardiac rhythm were suggested: the rate of changes in the frequency of the oscillatory component within a given time interval, the lengths of the fading periods for specific frequency oscillations detected on the cardiointervalogram, and the changes in the instantaneous frequency-amplitude ratios during the observation period. These indices allow a deeper insight into sympathetic and parasympathetic oscillators that affect the cardiac rhythm.
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