| Literature DB >> 8476974 |
M Meesmann1, F Grüneis, P Flachenecker, K D Kniffki.
Abstract
1/f fluctuations in heart rate are usually measured spectral analysis using Fast Fourier Transform. Here, we introduce a new method based on counting the number of QRS complexes in time intervals delta t of various length. For a 1/fb spectrum the variance of counts in delta t follows a power-law as delta t1+b. This method is applied to analyze long term fluctuations in heart rate variability in 10 healthy men. The results show periods of 1/f fluctuations with interpolated periods of white noise during night hours.Entities:
Mesh:
Year: 1993 PMID: 8476974 DOI: 10.1007/bf00201855
Source DB: PubMed Journal: Biol Cybern ISSN: 0340-1200 Impact factor: 2.086