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The mechanisms underlying systolic (SBP) and diastolic (DBP) blood pressure and heart rate (HR) beat-to-beat variability were investigated using spectral analysis in conscious genetically normotensive (LN) adult rats from the Lyon strain. Basal SBP, DBP and HR spectra exhibited peaks in low- (LF : 0.38 to 0.45 Hz) and high- (HF : 1.04 to 1.13 Hz) frequencies. The LF peak of SBP, and even more of DBP, could be attributed to the sympathetic nervous system influence as it disappeared after destruction of the sympathetic nerves or a combined alpha- and beta-adrenoceptor blockade whereas it was higher after blockade of the parasympathetic system. The HF peak of HR, linked to the respiratory rate, was abolished by the parasympathetic system blockade whereas those of SBP and DBP were enhanced. We conclude that the LF peak of DBP and the HF peak of HR are likely to represent useful estimates respectively of the sympathetic vascular control and of the parasympathetic cardiac control.
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