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1 Institut National de la
Santé et de la Recherche Médicale (INSERM) U337,
Because the use of spectral powers of blood
pressure (BP) and R-R interval (RR) in the low (LF) and high
frequencies (HF) to quantify sympathetic and parasympathetic activities
is still under debate, we questioned whether nonlinear methods may give better results. The BP signal was recorded for 30 min before and after
intravenous injection of hexamethonium (20 mg/kg), atropine (0.5 mg/kg), atenolol (1 mg/kg), and prazosin (1 mg/kg) in conscious, normotensive Wistar-Kyoto rats. Three nonlinear indexes [percentage of
recurrence, percentage of determinism, and length index
(Lmax)] extracted from the recurrence plot method were used to analyze the BP
signal. Sympathetic but not parasympathetic blockade reduced BP level
and its LF component. RR increased and decreased after 
- and
-blockades, respectively. Hexamethonium increased HF, and atropine
reduced LF, of RR. Sympathetic blockade and, in particular, -sympathetic blockade increased nonlinear indexes of BP. In
contrast, parasympathetic blockade by atropine increased nonlinear
indexes of RR. These results suggest that, compared with spectral
indexes, nonlinear indexes may be more specific markers of sympathetic and parasympathetic tones.
autonomic nervous system; cardiovascular control; spectral analysis; recurrence plot
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