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A new method for analysis of heart rate variability: counting statistics of 1/f fluctuations |
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| Authors: | Malte Meesmann Ferdinand Grüneis Peter Flachenecker Klaus-Dietrich Kniffki |
| Affiliation: | (1) Medizinische Universitätsklinik Würzburg, Josef-Schneider-Strasse 2, W-8700 Würzburg, Germany;(2) Fachhochschule München, Lothstrasse 34, W-8000 München 2, Germany;(3) Neurologische Universitätsklinik Würzburg, Josef-Schneider-Strasse 11, W-8700 Würzburg, Germany;(4) Physiologisches Institut der Universität Würzburg, Röntgenring 9, W-8700 Würzburg, Germany |
| Abstract: | 1/f fluctuations in heart rate are usually measured by spectral analysis using Fast Fourier Transform. Here, we introduce a new method based on counting the number of QRS complexes in time intervals  t of various length. For a 1/fb spectrum the variance of counts in t follows a power-law as gDt1+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. |
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