Comput Methods Programs Biomed - Increasing sensitivity in the measurement of heart rate variability: the method of non-stationary RR time-frequency analysis.

Tópicos

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Resumo

A novel method of the time-frequency analysis of non-stationary heart rate variability (HRV) is developed which introduces the fragmentary spectrum as a measure that brings together the frequency content, timing and duration of HRV segments. The fragmentary spectrum is calculated by the similar basis function algorithm. This numerical tool of the time to frequency and frequency to time Fourier transformations accepts both uniform and non-uniform sampling intervals, and is applicable to signal segments of arbitrary length. Once the fragmentary spectrum is calculated, the inverse transform recovers the original signal and reveals accuracy of spectral estimates. Numerical experiments show that discontinuities at the boundaries of the succession of inter-beat intervals can cause unacceptable distortions of the spectral estimates. We have developed a measure that we call the "RR deltagram" as a form of the HRV data that minimises spectral errors. The analysis of the experimental HRV data from real-life and controlled breathing conditions suggests transient oscillatory components as functionally meaningful elements of highly complex and irregular patterns of HRV.

Resumo Limpo

novel method timefrequ analysi nonstationari heart rate variabl hrv develop introduc fragmentari spectrum measur bring togeth frequenc content time durat hrv segment fragmentari spectrum calcul similar basi function algorithm numer tool time frequenc frequenc time fourier transform accept uniform nonuniform sampl interv applic signal segment arbitrari length fragmentari spectrum calcul invers transform recov origin signal reveal accuraci spectral estim numer experi show discontinu boundari success interbeat interv can caus unaccept distort spectral estim develop measur call rr deltagram form hrv data minimis spectral error analysi experiment hrv data reallif control breath condit suggest transient oscillatori compon function meaning element high complex irregular pattern hrv

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