Maternal exercise, season and sex modify the daily fetal heart rate rhythm

Acta Physiologica
J SlettenJ Kessler

Abstract

The knowledge on biological rhythms is rapidly expanding. We aimed to define the longitudinal development of the daily (24-hour) fetal heart rate rhythm in an unrestricted, out-of-hospital setting and to examine the effects of maternal physical activity, season and fetal sex. We recruited 48 women with low-risk singleton pregnancies. Using a portable monitor for continuous fetal electrocardiography, fetal heart rate recordings were obtained around gestational weeks 24, 28, 32 and 36. Daily rhythms in fetal heart rate and fetal heart rate variation were detected by cosinor analysis; developmental trends were calculated by population-mean cosinor and multilevel analysis. For the fetal heart rate and fetal heart rate variation, a significant daily rhythm was present in 122/123 (99.2%) and 116/121 (95.9%) of the individual recordings respectively. The rhythms were best described by combining cosine waves with periods of 24 and 8 hours. With increasing gestational age, the magnitude of the fetal heart rate rhythm increased, and the peak of the fetal heart rate variation rhythm shifted from a mean of 14:25 (24 weeks) to 20:52 (36 weeks). With advancing gestation, the rhythm-adjusted mean value of the fetal heart rate decreased linear...Continue Reading

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Citations

Nov 21, 2018·Acta Physiologica·Pontus B Persson, Anja Bondke Persson
Aug 28, 2020·Acta Physiologica·Anna-Marie Finger, Achim Kramer
Oct 15, 2019·Acta Physiologica·Pontus B Persson, Anja Bondke Persson
Mar 26, 2021·Developmental Psychobiology·Janet A DiPietroGrace W Pien

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