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Spectral analysis of resting variability of some circulatory parameters in man

, : Spectral analysis of resting variability of some circulatory parameters in man. Physiologia Bohemoslovaca 27(4): 349-357

The blood pressure and finger blood flow were recorded by indirect photoelectric methods, with heart rate and respiration, in 13 experimental subjects. The systolic pressure (SP), diastolic pressure (DP) and pulse pressure (PP), heart rate (HR), acral (finger) blood flow (BF) and spirogram (R) were read from 5 and 20 min segments at 1 s intervals. Autocorrelation functions were calculated from these values and power spectral densities, cross correlation functions, cross-spectral densities and coherence of the individual pairs of parameters were studied. Several maxima were found in the power spectra: at 0-3 cycles/min frequency in DP, BF and sometimes SP and PP, at 5-8 cycles/min in HR and sometimes in SP, PP and DP and occasionally BF. Respiratory rhythm (8-18 cycles/min) was marked in HR, less marked in SP, PP and DP and absent in BF. Cross-correlation and cross-spectral analysis showed that DP changes lagged 2-4 s behind HR changes, but were ahead of BF changes by 1-4 s, of SP changes by 1-2 s and of PP changes, at slow frequencies, by 1-5 s. Respiratory rhythm PP changes preceded DP changes by 0.5-2 s. HR changes usually lagged 1 s behind R changes. Spectrograms obtained from repeated recording in the same subject were similar, although there was great interindividual variability in autospectra, and in reciprocal relationships of various circulatory parameters.

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Accession: 006459436

PMID: 151293

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