ArticleBJOG : an international journal of obstetrics and gynaecology2026
Objectively Measured Maternal Supine Sleep and Fetal Growth: A Prospective Cohort Study.
Article in BJOG : an international journal of obstetrics and gynaecology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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1 citing paper in PubMed.
- Objectively Measured Maternal Supine Sleep and Fetal Growth: A Prospective Cohort Study.BJOG : an international journal of obstetrics and gynaecology · 2026Article
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Authors and funding
6 authors.
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Abstract
objectiveTo explore the relationship between different definitions of objectively measured supine sleep position during late pregnancy and customised birthweight centile, as a marker of fetal wellbeing.
designProspective cohort study.
settingAustralian public hospital antenatal clinic. POPULATION: Eighty-four pregnant women from 32-36 weeks of gestation.
methodsBody position was measured in degrees of roll using a tri-axial accelerometer worn around the abdomen for seven sequential nights. Supine was defined as 'broad supine' (0° = fully supine to 45° left/right tilt), and 'supine low-tilt' (0°-15°). Two additional Risk Indices capturing risk proportional to duration spent in each degree of supine-to-lateral tilt were developed. Birthweights were converted into customised centiles using GROW software.
main outcome measuresThe primary outcome was customised birthweight centile. Secondary outcomes included birthweight, gestational age at delivery, and fetal growth trajectory.
resultsAcross 556 nights of data, the median nightly duration of broad supine positioning was 65.9 [25.0, 125.7] minutes compared to only 9.1 [0.7, 24.4] minutes of supine low-tilt. There was no relationship between customised birthweight centile and time spent in broad supine (R
conclusionIn this cohort, there was no evidence of an association between objectively measured supine sleep and customised birthweight centile. Yet to be identified mechanisms unrelated to fetal growth may be responsible for supine going-to-sleep position being a risk factor for late stillbirth. Further prospective investigation is needed to untangle cause and effect; however, given the low rate of stillbirth, such a study may not be feasible.
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