Journal ArticleDOI
THe relationship between myometrial activity and sleep state and breathing in fetal sheep throughout the last third of gestation.
TLDR
Between 106 and 144 days' gestation, periods of uterine electromyographic activity and associated increases in uterine tone (contractures) were accompanied by a change in fetal ocular activity in 294 (63%) of 467 cases, and the change from breathing activity to quiescence was statistically significant.About:
This article is published in American Journal of Obstetrics and Gynecology.The article was published on 1980-11-15. It has received 143 citations till now.read more
Citations
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Journal ArticleDOI
Uterine electromyography: A critical review
TL;DR: This work summarizes uterine animal and human electromyographic information obtained at cellular, myometrial, and abdominal levels during gestation and parturition to show that both internal and external electromyograms occur in phase with intrauterine pressure increase and exhibit similar spectra.
Journal ArticleDOI
Dynamics of fetal circulatory responses to hypoxia and asphyxia.
TL;DR: This review will focus on the dynamic changes of the fetal circulation, the distribution of organ blood flow during normoxemia, and that during hypoxia and asphyxia caused by various experimental perturbations.
Journal ArticleDOI
A comparative study of cardiovascular, endocrine and behavioural effects of betamethasone and dexamethasone administration to fetal sheep.
Jan B. Derks,Dino A. Giussani,Susan L. Jenkins,Richard A. Wentworth,Gerard H. A. Visser,James F. Padbury,Peter W. Nathanielsz +6 more
TL;DR: Preliminary results indicate that prenatal betamethasone and dexameth asone treatment of late‐gestation fetal sheep, in doses similar to those employed clinically, is associated with fetal cardiovascular, endocrine and behavioural effects.
Journal ArticleDOI
Circadian Rhythms During Pregnancy
TL;DR: Circadian rhythms are predictive adaptations to the daily periods of light and dark induced by rotation of the earth around its axis loosely defined as changes in a physiological function with a period of approximately 24 h.
Journal ArticleDOI
Electromyographic activity of the nonpregnant and pregnant sheep uterus
R. Harding,R. Harding,E.R. Poore,E.R. Poore,A. Bailey,A. Bailey,G.D. Thorburn,G.D. Thorburn,C.A.M. Jansen,C.A.M. Jansen,P.W. Nathanielsz,P.W. Nathanielsz +11 more
TL;DR: It is demonstrated that the recording of uterine electromyograms provides a precise and sensitive method for the study of the early changes that lead to labor and delivery.
References
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Journal ArticleDOI
Respiratory movements and rapid eye movement sleep in the foetal lamb
TL;DR: In foetal lambs from 40 days gestation (0·27 of term) onwards delivered into a warm saline bath, apparently spontaneous breathing movements were present intermittently and became deeper and more rapid with increasing age.
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Respiratory function of the larynx in developing sheep and the influence of sleep state.
TL;DR: Adduction of the larynx is dependent on behavioural state and appears to be the principal means of regulating TE in sheep, particularly during early post-natal development.
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Continuous variability of fetal Po2 in the chronically catheterized fetal sheep
C.A.M. Jansen,Elliot J. Krane,A.L. Thomas,N. F.G. Beck,K.C. Lowe,P. L. Joyce,M. Parr,P. W. Nathanielsz +7 more
TL;DR: A method of continuous monitoring of fetal intravascular PO2 at various sites in the circulation in the chronically catheterized fetal sheep for up to 41 days has been compared with values obtained in blood samples measured extracorporeally in a standard blood gas analyzer.
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Development of sleep and wakefulness in the foetal lamb.
TL;DR: The evolution of cortical activity was studied from 0.6 of term in utero in eleven foetal lambs, and through most of parturition and the early post-partum period in two newborn lambs.
Journal ArticleDOI
Sleep cycles and kinesis in the foetal lamb
TL;DR: Continuous recording of foetal ECoG, eye and body movements and heart rate were carried in the same animal during late pregnancy and perinatal period and the main criterion for distinguishing alert wakefulness from NREM sleep was oculomotor activity.