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Autonomic mediation of the interdependence between variability signals of heart rate and blood pressure in the lizard Gallotia galloti

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Abstract:

Autonomic nervous system (ANS) involvement in the mediation of the synchronization between beat-to-beat RR interval variability (RRIV) and systolic blood pressure variability (SBPV) signals of the lizard Gallotia galloti (Oudart, 1839) was investigated through linear and nonlinear time series analysis methods in a pharmacological blockade context. The ANS blockers used were atropine, prazosin, and propranolol. The interdependence between the signals was quantified by means of the magnitude-squared coherence (MSC), which measures amplitude and phase linear synchronization; the phase lag index (PLI), which evaluates the phase synchronization; and the index L, which quantifies the generalized linear and nonlinear synchronization. Atropine decreased the PLI in the low-frequency (LF: 0.01–0.05 Hz) range; prazosin decreased the MSC in the medium-frequency (MF: 0.06–0.15 Hz) range; and propranolol did not alter any of the interdependence measures. It is suggested that (i) the cholinoceptor activity mediates the phase cardiovascular synchronization in the LF range; (ii) the α1-adrenoceptor activity mediates the amplitude and phase linear cardiovascular synchronization in the MF range; and (iii) the β-adrenoceptor activity plays no role in mediating any dynamics of cardiovascular synchronization in the studied frequency range. When comparing these results with those in mammals, a lesser overall autonomic involvement in the mediation of the studied cardiovascular interdependences is seen in reptiles.

Keywords: Gallotia galloti; Gallot’s lizard; analyse spectrale; autonomic nervous system; cardiovascular variability; lézard de Gallot; méthodes non linéaires; nonlinear methods; spectral analysis; synchronisation; synchronization; système nerveux autonome; variabilité cardiovasculaire

Document Type: Research Article

DOI: http://dx.doi.org/10.1139/z2012-052

Affiliations: 1: Laboratory of Biophysics, Department of Physiology, University of La Laguna, 38071-La Laguna, Tenerife, Canary Islands, Spain. 2: Institut Universitari de Ciencies de la Salut, Universitat de les Illes Balears, 07071-Palma de Mallorca, Mallorca, Illes Balears, Spain. 3: Electrical Engineering and Bioengineering Group, Department of Basic Physics, University of La Laguna, 38206-La Laguna, Tenerife, Canary Islands, Spain.

Publication date: July 22, 2012

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  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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