Complex-valued lomb-welch transform for the analysis of heart rate variability
|Complex-valued lomb-welch transform for the analysis of heart rate variability|
|Tạp chí Proceedings of the 20th Scientific Conference, Hanoi University of Technology 2006 Oct. 3; ():1-3|
|Tác giả||Tran Thong|
|Nơi thực hiện||Department of Biomedical Engineering, Oregon Health & Science University|
|DOI [ URL] [ PDF]|
Abstract Traditionally the frequency power spectrum of heart rate variability (HRV) has been derived by taking R-R intervals, interpolating them to a regular sampling grid, and then evaluating the Fourier transform power. A problem with this method has been the attenuation of high frequency components. The Lomb-Scargle transform has been proposed to evaluate the frequency power spectrum directly. For long data series, the Lomb-Welch power transform has been proposed to yield regularly timed sets of spectral components. In this paper, we derive the complex- valued Lomb-Welch transform. The phase information can be used to research phase relationships between various spectral components of HRV.