NDLI: Study of cardiac, respiratory, and motor activities in rat fetuses

Content Provider	Springer Nature Link
Author	Timofeeva, O. P. Vdovichenko, N. D.
Copyright Year	2009
Abstract	Development of the cardiac, respiratory, and motor activities in rat fetuses with preserved placental circulation was studied at the 16th, 18th, and 20th gestation days. The presence of three main movement types has been found: complexes of generalized activity, local movements, and jerks. In development of respiratory function, there is observed a gradual transition from individual inspirations to series of breathing movements and then to formation of periodic breathing episodes. At the studied period, the heart rate has been found to increase. The existence of the slow-wave modulations of the heart rate with a period of 2040 s has been revealed. Analysis of interrelations between the respiratory and motor systems has shown that in the 16-day fetuses, each breathing movement is accompanied by extensor jerk. By the 20th days of embryonic development (E20), uncoupling of the respiratory and motor activities occurs. Comparison of the activity observed in the cardiac and somatomotor systems has shown that at E16, the cardiac rhythm fluctuations do not depend on the motor excitation jerks. In the 18-day fetuses, brief slowing down (decelerations) of the cardiac rhythm appeared during the motor activity jerks, whereas at E20, on the contrary, an increase of frequency (accelerations) of the cardiac rhythm occurred.
Starting Page	678
Ending Page	686
Page Count	9
File Format	PDF
ISSN	00220930
Journal	Journal of Evolutionary Biochemistry and Physiology
Volume Number	45
Issue Number	6
e-ISSN	16083202
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2010-02-26
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	rat fetuses motor activity fetal respiration cardiac rhythm modulations Animal Physiology Biochemistry Evolutionary Biology
Content Type	Text
Resource Type	Article
Subject	Physiology Biochemistry Ecology, Evolution, Behavior and Systematics

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