Abstract
Application of discrete wavelet transform to the temporal location of the frequency structure of the cardiac rhythm is considered. A method for analysis of tachograms (TGs) consisting of signal preparation, discrete wavelet transform, and a variant of estimation of the relative contributions of the rhythm frequency components is suggested. The use of the method is exemplified by analysis of a TG containing recordings of transitional processes, including the moments of a fixed respiration rate test, Valsalva test, and orthostatic test. The detected characteristics of changes in the frequency components are demonstrated by comparing them with the changes in the integral index of the total regulatory effect on the sinus node, which forms the response to these functional tests.
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