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We aimed to examine the association between <jats:styled-content style=\"fixed-case\">LTPA<\/jats:styled-content> during early and late pregnancy and newborn anthropometric outcomes.<\/jats:p><\/jats:sec><jats:sec><jats:title>Design<\/jats:title><jats:p>Individual level meta\u2010analysis, which reduces heterogeneity across studies.<\/jats:p><\/jats:sec><jats:sec><jats:title>Setting<\/jats:title><jats:p>A consortium of eight population\u2010based studies (seven European and one <jats:styled-content style=\"fixed-case\">US<\/jats:styled-content>) comprising 72\u00a0694 participants.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Generalised linear models with consistent inclusion of confounders (gestational age, sex, parity, maternal age, education, ethnicity, <jats:styled-content style=\"fixed-case\">BMI<\/jats:styled-content>, smoking, and alcohol intake) were used to test associations between self\u2010reported <jats:styled-content style=\"fixed-case\">LTPA<\/jats:styled-content> at either early (8\u201318\u00a0weeks gestation) or late pregnancy (30+\u00a0weeks) and the outcomes. Results were pooled using random effects meta\u2010analyses.<\/jats:p><\/jats:sec><jats:sec><jats:title>Main outcome measures<\/jats:title><jats:p>Birth weight, large\u2010for\u2010gestational age (<jats:styled-content style=\"fixed-case\">LGA<\/jats:styled-content>), macrosomia, small\u2010for\u2010gestational age (<jats:styled-content style=\"fixed-case\">SGA<\/jats:styled-content>), % body fat, and ponderal index at birth.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Late, but not early, gestation maternal moderate to vigorous physical activity (<jats:styled-content style=\"fixed-case\">MVPA<\/jats:styled-content>), vigorous activity, and <jats:styled-content style=\"fixed-case\">LTPA<\/jats:styled-content> energy expenditure were modestly inversely associated with <jats:styled-content style=\"fixed-case\">BW<\/jats:styled-content>,<jats:styled-content style=\"fixed-case\"> LGA<\/jats:styled-content>, macrosomia, and ponderal index, without heterogeneity (all: <jats:italic>I<\/jats:italic><jats:sup>2<\/jats:sup>\u00a0=\u00a00%). For each extra hour\/week of <jats:styled-content style=\"fixed-case\">MVPA<\/jats:styled-content>,<jats:styled-content style=\"fixed-case\"> RR<\/jats:styled-content> for <jats:styled-content style=\"fixed-case\">LGA<\/jats:styled-content> and macrosomia were 0.97 (95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content>: 0.96, 0.98) and 0.96 (95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content>: 0.94, 0.98), respectively. Associations were only modestly reduced\u00a0after additional adjustments for maternal <jats:styled-content style=\"fixed-case\">BMI<\/jats:styled-content> and gestational diabetes. No measure of <jats:styled-content style=\"fixed-case\">LTPA<\/jats:styled-content> was associated with risk for <jats:styled-content style=\"fixed-case\">SGA<\/jats:styled-content>.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Physical activity in late, but not early, pregnancy is consistently associated with modestly lower risk of <jats:styled-content style=\"fixed-case\">LGA<\/jats:styled-content> and macrosomia, but not <jats:styled-content style=\"fixed-case\">SGA<\/jats:styled-content>.<\/jats:p><\/jats:sec><jats:sec><jats:title>Tweetable abstract<\/jats:title><jats:p>In an individual participant meta\u2010analysis, late pregnancy moderate to vigorous physical activity modestly reduced birth size outcomes.<\/jats:p><\/jats:sec>","DOI":"10.1111\/1471-0528.15476","type":"journal-article","created":{"date-parts":[[2018,9,19]],"date-time":"2018-09-19T10:41:31Z","timestamp":1537353691000},"page":"459-470","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":61,"title":["Associations between maternal physical activity in early and late pregnancy and offspring birth size: remote federated individual level meta\u2010analysis from eight cohort studies"],"prefix":"10.1111","volume":"126","author":[{"given":"S","family":"Pastorino","sequence":"first","affiliation":[{"name":"MRC Epidemiology Unit University of Cambridge Cambridge UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"T","family":"Bishop","sequence":"additional","affiliation":[{"name":"MRC Epidemiology Unit University of Cambridge Cambridge UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"SR","family":"Crozier","sequence":"additional","affiliation":[{"name":"MRC Lifecourse Epidemiology Unit (University of Southampton) Southampton General Hospital Southampton UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"C","family":"Granstr\u00f6m","sequence":"additional","affiliation":[{"name":"Department of Epidemiology Research Centre for Fetal Programming State Serum Institute Copenhagen Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"K","family":"Kordas","sequence":"additional","affiliation":[{"name":"Epidemiology and Environmental Health School of Public Health and Health Professions University at Buffalo Buffalo NY USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"LK","family":"K\u00fcpers","sequence":"additional","affiliation":[{"name":"Department of Epidemiology University Medical Center Groningen University of Groningen Groningen the Netherlands"},{"name":"MRC Integrative Epidemiology Unit School of Social and Community Medicine University of Bristol Bristol UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"EC","family":"O'Brien","sequence":"additional","affiliation":[{"name":"Obstetrics &amp; 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