Relationships between short-term blood-pressure fluctuations and heart-rate variability in resting subjects I: a spectral analysis approach |
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Authors: | R. W. de Boer J. M. Karemaker J. Strackee |
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Affiliation: | (1) Department of Physiology, University of Amsterdam, M-01 Mejbergdreef 15, 1105 AZ Amsterdam, The Netherlands;(2) Laboratory of Medical Physics, University of Amsterdam, L-0 Meibergdreef 15, 1105 AZ Amsterdam, The Netherlands |
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Abstract: | A method to attribute the short-term variability of blood pressure and heart rate of resting subjects to their various causes, using spectral techniques, is presented. Power spectra and cross-spectra are calculated for beat-to-beat values of R-R interval and blood pressure from subjects who were seated in a comfortable chair. Interval values as well as systolic, mean and pulse pressures show variations linked to respiration and to the so-called 10 s rhythm. The diastolic pressure values are scarcely influenced by respiration in the normal respiratory range (0·20–0·35 Hz), but do show 10 s variability. Relationships between pressure and interval variability which indicate that the 10 s variability in systolic pressure leads the interval variation by two to three beats become manifest in cross-spectra; however, no such lag is found between the respiration-linked variations in systolic pressure and intervals. It is argued that the technique presented provides a critical test for models of the fast regulation of the cardiovascular system. |
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Keywords: | Blood pressure Blood-pressure fluctuations Cross spectrum Heart rate Heart-rate variability Power spectrum Spectral analysis |
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