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Using custom\u2010designed software, <jats:styled-content style=\"fixed-case\">MHR<\/jats:styled-content> and indicators of <jats:styled-content style=\"fixed-case\">HRV<\/jats:styled-content> were obtained from the recorded maternal electrocardiograms and compared with birthweight and z\u2010scores of birthweight adjusted for gestation and gender.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Data from 5655 women were included. <jats:styled-content style=\"fixed-case\">MHR<\/jats:styled-content> increased from 84.6\u00a0bpm at 20\u201324\u00a0weeks to 88.3\u00a0bpm at 34+\u00a0weeks. Increasing <jats:styled-content style=\"fixed-case\">MHR<\/jats:styled-content> from 70\u201380 to 80\u201390 and 90\u2013100\u00a0bpm at 20\u201324\u00a0weeks was associated with increasing birthweight from 2940 to 2998 and 3032\u00a0g, respectively (<jats:italic>P<\/jats:italic>&lt;0.05). <jats:styled-content style=\"fixed-case\">MHR<\/jats:styled-content> and <jats:styled-content style=\"fixed-case\">HRV<\/jats:styled-content> contributed 29% to the variability associated with birthweight, whereas maternal body mass index at recruitment contributed 44%. Similar associations were observed for <jats:styled-content style=\"fixed-case\">MHR<\/jats:styled-content> at 34+\u00a0weeks.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>The observed association of low maternal heart rate with birthweight might help to identify pregnancies at risk of poor fetal growth.<\/jats:p><\/jats:sec>","DOI":"10.1002\/ijgo.12873","type":"journal-article","created":{"date-parts":[[2019,5,27]],"date-time":"2019-05-27T09:42:11Z","timestamp":1558950131000},"page":"250-256","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["Effects of low maternal heart rate on fetal growth and\u00a0birthweight"],"prefix":"10.1002","volume":"146","author":[{"given":"Hein","family":"Odendaal","sequence":"first","affiliation":[{"name":"Department of Obstetrics and Gynaecology Faculty of Medicine and Health Sciences Stellenbosch University  Tygerberg South 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