2009
DOI: 10.1152/ajpregu.90979.2008
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The role of the neural sympathetic and parasympathetic systems in diurnal and sleep state-related cardiovascular rhythms in the late-gestation ovine fetus

Abstract: AJ. The role of the neural sympathetic and parasympathetic systems in diurnal and sleep state-related cardiovascular rhythms in the late-gestation ovine fetus. Am J Physiol Regul Integr Comp Physiol 297: R998 -R1008, 2009. First published July 29, 2009 doi:10.1152/ajpregu.90979.2008.-The efferent mechanisms mediating the well-known diurnal cardiovascular rhythms in the lategestation fetus are only partially understood. In the present study, we evaluated the contribution of the parasympathetic and sympathetic… Show more

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Cited by 35 publications
(44 citation statements)
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“…These changes may reflect circadian rhythms in fetal brain perfusion, similar to a fetal lamb circadian rhythm in carotid arterial blood flow (32). Although changes from morning to afternoon MCA Doppler indices represent circadian rhythms, this suggests that SSRIs do not affect fetal circadian rhythms, but rather affect links between the circadian rhythm generator and entrained physiologic variables, such as fHR variability.…”
Section: Discussionmentioning
confidence: 98%
“…These changes may reflect circadian rhythms in fetal brain perfusion, similar to a fetal lamb circadian rhythm in carotid arterial blood flow (32). Although changes from morning to afternoon MCA Doppler indices represent circadian rhythms, this suggests that SSRIs do not affect fetal circadian rhythms, but rather affect links between the circadian rhythm generator and entrained physiologic variables, such as fHR variability.…”
Section: Discussionmentioning
confidence: 98%
“…We have previously reported cardiovascular data from a subset (n = 5) of these fetuses (Jensen et al 2009). …”
Section: Autonomic Control Studymentioning
confidence: 99%
“…Moreover, the relative contribution of the SNS and PNS to the HRV power spectrum is controversial (Metsala et al 1995;Kimura et al 1996;Yu et al 1998;Yu & Lumbers, 2000). Both systems are active in late gestation, and influence both basal cardiovascular function and sleep state-related changes (Zhu & Szeto, 1987;Wakatsuki et al 1992;Jensen et al 2009). There is strong direct and indirect evidence for further maturation of the SNS (Segar et al 1992;Wakatsuki et al 1992;Booth et al 2011) and PNS in the last third of gestation (Nuwayhid et al 1975;Assali et al 1977;Walker et al 1978).…”
Section: Introductionmentioning
confidence: 99%
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“…Fetal body and breathing movements, baroreflex and circadian processes also influence HRV. (2,3,(4)(5)(6) There is also some evidence that intrinsic pacemaker rhythms of the sino-atrial node affect HRV in critically ill adults. (7) However, whether intrinsic HRV (iHRV) exists in the fetal period and whether this is affected by chronic fetal hypoxia has never been tested.…”
Section: Introductionmentioning
confidence: 99%