Secondary rhythms of automatically functioning systems

• Published in: Journal of evolutionary biochemistry and physiology Vol. 45; no. 6; pp. 670 - 677
• Main Authors: Bursian, A. V, Dmitrieva, L. E, Sizonov, V. A
• Format: Journal Article
• Language: English
• Published: Dordrecht Dordrecht : SP MAIK Nauka/Interperiodica 01.12.2009; SP MAIK Nauka/Interperiodica; Springer Nature B.V
• Subjects: Animal Physiology; Biochemistry; Biology; Biomedical and Life Sciences; Comparative and Ontogenic Physiology; Evolutionary Biology; Heart rate; Life Sciences; Newborn babies; Physiology; synchronization of autorhythmic functions; endogenous rhythms; ontogenesis
• ISSN: 0022-0930; 1608-3202
• DOI: 10.1134/S0022093009060040

In wakeful rats at the age from newborn to 3 weeks there were studied interrelations of rhythmical oscillations of heart rate, respiration rate, and periodic spontaneous motor activity. In all studied systems, these oscillations are coordinated and occur in several frequency diapasons. Frequencies in the near-minute diapason (the period from 30 to 90 s) are the most constant and do not change with age. Regular oscillations are the most stable in newborns. Bursts of motor activity usually are irregular, but episodically the distinct near-minute rhythm is traced. Studies of the character of interaction of the heart activity, respiration, and periodic somatomotor excitation allow stating that the main coordination pathway of spontaneous autorhythmic functions in early postnatal ontogenesis is formation of secondary rhythms. Possible ways of formation of the secondary rhythms are considered.