Abstract
Biological rhythms, describing the temporal variation of biological processes, are a characteristic feature of complex systems. The analysis of biological rhythms can provide important insights into the pathophysiology of different diseases, especially, in cardiovascular medicine. In the field of the autonomic nervous system, heart rate variability (HRV) and baroreflex sensitivity (BRS) describe important fluctuations of blood pressure and heart rate which are often analyzed by Fourier transformation. However, these parameters are stochastic with overlaying rhythmical structures. R–R intervals as independent variables of time are not equidistant. That is why the trigonometric regressive spectral (TRS) analysis—reviewed in this paper—was introduced, considering both the statistical and rhythmical features of such time series. The data segments required for TRS analysis can be as short as 20 s allowing for dynamic evaluation of heart rate and blood pressure interaction over longer periods. Beyond HRV, TRS also estimates BRS based on linear regression analyses of coherent heart rate and blood pressure oscillations. An additional advantage is that all oscillations are analyzed by the same (maximal) number of R–R intervals thereby providing a high number of individual BRS values. This ensures a high confidence level of BRS determination which, along with short recording periods, may be of profound clinical relevance. The dynamic assessment of heart rate and blood pressure spectra by TRS allows a more precise evaluation of cardiovascular modulation under different settings as has already been demonstrated in different clinical studies.
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Ziemssen, T., Reimann, M., Gasch, J. et al. Trigonometric regressive spectral analysis: an innovative tool for evaluating the autonomic nervous system. J Neural Transm 120 (Suppl 1), 27–33 (2013). https://doi.org/10.1007/s00702-013-1054-5
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DOI: https://doi.org/10.1007/s00702-013-1054-5