The results let us suppose that there are at least four periodical phenomena of HRV. Two of them have not been discovered and physiologically explained yet. It has also been confirmed that heart rate oscillations are quasiperiodic and their frequencies vary widely over the main frequencies. Despite of difference of the peak frequencies the waves of factor loadings are overlapped. Therefore, power of spectral density within any frequency range could not measure activity or it’s changing of a modulating physiological mechanism
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