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Klimova O. A., Semenova M. A., Anishchenko T. G., Igosheva N. B. Normalized entropy in the evaluation of cardiovascular responses to different perturbations in male and female rats. Izvestiya VUZ. Applied Nonlinear Dynamics, 2003, vol. 11, iss. 2, pp. 108-115. DOI: 10.18500/0869-6632-2003-11-2-108-115
Normalized entropy in the evaluation of cardiovascular responses to different perturbations in male and female rats
In this research we studied the cardiovascular sensitivity to parasympathetic blockade in normal and castrated male and female rats under usual and stress conditions using the traditional physiological measures and a new measure of complexity of blood pressure dynamics - normalized entropy Е/Н. The results showed that changes in E/H were more pronounced and prolonged in comparison with heart rate and blood pressure. Also, unlike the latter, Е/Н increased in one part оf rats аn decreased in another part оf ones. These quantitative аnd qualitative particularities in Е/Н changes give evidence that using a new measure of complexity degree of blood pressure signal one can receive an additional information about the changes in cardiovascular system evoked by different perturbations.
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