Interrelations of the Autogenic Somatomotor Excitation of the Cardiac Activity in Developing Rats

• Published in: Journal of evolutionary biochemistry and physiology Vol. 40; no. 2; pp. 182 - 188
• Main Authors: Bursian, A. V., Dmitrieva, L. E., Polyakova, L. A., Sizonov, V. V.
• Format: Journal Article
• Language: English
• Published: New York Springer Nature B.V 01.03.2004
• Subjects: Nervous system
• ISSN: 0022-0930; 1608-3202
• DOI: 10.1023/B:JOEY.0000033810.19631.d0

In developing rats aged from newborns to 1.5 months, regularities were studied of the heart rate fluctuations associated with periodic bursts of the endogenous somatomotor excitation characteristic of early stages of postnatal ontogenesis of immature born animals. It has been established that decelerations predominate on the background of the motor bursts for the first week of life, whereas accelerations, since the beginning of the 3rd week. The heart rhythm changes can precede or lag behind the beginning of the motor excitation, which allows judging about the existence of two mechanisms of the interaction: about the heart reaction to motor activity and about the central drivers acting simultaneously on the both systems. Experiments with chronic desympathization and block of β-adrenoreceptors indicate a participation of the sympathetic nervous system in formation of the motor-cardiac interaction.[PUBLICATION ABSTRACT]