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In normally breathing subjects, periodicities in blood pressure (BP) and heart rate (HR) often occur in three main frequency bands: high-frequency (0.20-0.45 Hz), mid-frequency (0.08-0.12 Hz), and low-frequency regions (0.02-0.06 Hz). While the high-frequency oscillations occur in synchrony with respiratory movements and mid-frequency oscillations are probably due to sympathetic baroreflex-feedback, the sources of low-frequency oscillations are less well known. A possible explanation for low-frequency oscillations in the circulation ensues from periodicities in the breathing pattern, of which sleep apnoea syndrome (SAS) is an extreme example. We applied spectral analysis to the pronounced low-frequency BP- and HR-variations that occur during sleep in this syndrome. The obtained power and cross spectra could be explained by a simple model that assumes peripheral chemoreceptor reflexes to be the main link between low-frequency variations in the respiratory and circulatory systems in SAS.
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