{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,20]],"date-time":"2026-05-20T05:07:41Z","timestamp":1779253661350,"version":"3.51.4"},"reference-count":84,"publisher":"Oxford University Press (OUP)","issue":"2","license":[{"start":{"date-parts":[[2026,3,13]],"date-time":"2026-03-13T00:00:00Z","timestamp":1773360000000},"content-version":"vor","delay-in-days":71,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,4,24]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Study Objectives<\/jats:title>\n                    <jats:p>Appropriate duration and high-quality sleep is essential for overall well-being and may be improved through engaging in daytime physical activity (PA). Yet the postpartum period is a particularly challenging time for these health behaviors, and sleep in this population has received little attention in scientific literature. This study examined the associations of daily PA and sedentary behavior (SED) with postpartum sleep measures, both obtained from wrist-worn ActiGraph devices.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Data come from the Pregnancy Environment and Lifestyle Study-2 cohort, a racially and ethnically diverse longitudinal cohort of postpartum mothers who delivered at Kaiser Permanente Northern California in 2018\u20132019. Participants (N\u00a0=\u2009136) wore ActiGraph wGT3X-BT devices on their non-dominant wrists for 7\u00a0days at 6\u00a0months postpartum. ActiGraph data were processed in RStudio using validated algorithms for device wear time, PA metrics (i.e. minutes of moderate-to-vigorous physical activity [MVPA], light physical activity [LPA], and SED, bedrest), and sleep quality metrics (i.e. nightly sleep duration; frequency of sleep interruptions; sleep efficiency [defined total nocturnal sleep\/total sleep period\u2009\u00d7\u2009100%]; and average duration of sleep interruptions). We estimated associations using mixed-effects models in SAS, adjusted for participant characteristics and daytime bedrest.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Participants engaged in a median of 66\u00a0min\/day (Q1\u2013Q3: 36.0\u2013101.0) of MVPA and 340.0\u00a0min\/day (Q1\u2013Q3: 272.0\u2013422.0) of SED; neither were associated with sleep duration. In the adjusted model, for every additional 10\u00a0min of daily LPA, there was 0.12 per cent higher sleep efficiency; in contrast, every additional 10\u00a0min of SED was associated with 0.10 per cent lower sleep efficiency (both p\u00a0&amp;lt;\u2009.05). For each additional 10\u00a0min of daily MVPA, LPA, and SED, the average length of sleep interruptions was 0.65\u00a0min shorter, 0.52\u00a0min shorter, and 0.36\u00a0min longer, respectively (all p\u00a0&amp;lt;\u2009.05).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>More daytime PA, regardless of intensity, may modestly improve sleep quality, while more daytime SED may diminish sleep quality at 6\u00a0months postpartum.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1093\/sleepadvances\/zpag033","type":"journal-article","created":{"date-parts":[[2026,3,13]],"date-time":"2026-03-13T12:15:58Z","timestamp":1773404158000},"source":"Crossref","is-referenced-by-count":0,"title":["Repeated device-based measures of daily movement, sedentary behavior, and sleep at 6\u00a0months postpartum: the Pregnancy Environment and Lifestyle Study-2 cohort"],"prefix":"10.1093","volume":"7","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9413-8638","authenticated-orcid":false,"given":"Bethany R","family":"Hallenbeck","sequence":"first","affiliation":[{"name":"Division of Research, Kaiser Permanente Northern California , Pleasanton, CA ,","place":["United States"]},{"name":"Department of Kinesiology, Recreation, and Sports Studies, University of Tennessee Knoxville , Knoxville, TN ,","place":["United States"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3920-0945","authenticated-orcid":false,"given":"Susan D","family":"Brown","sequence":"additional","affiliation":[{"name":"Department of Internal Medicine, University of California Davis , Sacramento, CA ,","place":["United States"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Scott E","family":"Crouter","sequence":"additional","affiliation":[{"name":"Department of Kinesiology, Recreation, and Sports Studies, University of Tennessee Knoxville , Knoxville, TN ,","place":["United States"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Assiamira","family":"Ferrara","sequence":"additional","affiliation":[{"name":"Division of Research, Kaiser Permanente Northern California , Pleasanton, CA ,","place":["United States"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hillary","family":"Serrato-Bandera","sequence":"additional","affiliation":[{"name":"Division of Research, Kaiser Permanente Northern California , Pleasanton, CA ,","place":["United States"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jun","family":"Shan","sequence":"additional","affiliation":[{"name":"Division of Research, Kaiser Permanente Northern California , Pleasanton, CA ,","place":["United States"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Matthew P","family":"Buman","sequence":"additional","affiliation":[{"name":"College of Health Solution, Arizona State University , Phoenix, AZ ,","place":["United States"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Samantha F","family":"Ehrlich","sequence":"additional","affiliation":[{"name":"Division of Research, Kaiser Permanente Northern California , Pleasanton, CA ,","place":["United States"]},{"name":"Department of Kinesiology, Recreation, and Sports Studies, University of Tennessee Knoxville , Knoxville, TN ,","place":["United States"]},{"name":"Department of Obstetrics & Gynecology, College of Medicine, University of Tennessee Health Science Center , Knoxville, TN ,","place":["United States"]}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"286","published-online":{"date-parts":[[2026,3,13]]},"reference":[{"key":"2026052000163541700_ref1","doi-asserted-by":"publisher","volume-title":"Sleep","author":"","DOI":"10.5665\/sleep.4716"},{"key":"2026052000163541700_ref2","volume-title":"1 in 3 Adults Don\u2019t Get Enough Sleep","author":"Centers for Disease 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