{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,8]],"date-time":"2026-10-08T19:24:03Z","timestamp":1791487443720,"version":"4.3.4"},"reference-count":45,"publisher":"Wiley","issue":"11","license":[{"start":{"date-parts":[[2021,11,4]],"date-time":"2021-11-04T00:00:00Z","timestamp":1635984000000},"content-version":"vor","delay-in-days":3,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"DOI":"10.13039\/100009633","name":"Eunice Kennedy Shriver National Institute of Child Health and Human Development","doi-asserted-by":"publisher","award":["1F32HD082982"],"award-info":[{"award-number":["1F32HD082982"]}],"id":[{"id":"10.13039\/100009633","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100009633","name":"Eunice Kennedy Shriver National Institute of Child Health and Human Development","doi-asserted-by":"publisher","award":["Z1A\u2010HD00641"],"award-info":[{"award-number":["Z1A\u2010HD00641"]}],"id":[{"id":"10.13039\/100009633","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Obesity"],"published-print":{"date-parts":[[2021,11]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Objective<\/jats:title><jats:p>Beyond sleep duration, other facets of sleep such as variability and timing may be associated with obesity risk in youth. However, data are limited. Using a longitudinal design, this study tested whether multiple facets of sleep were associated with fat mass gain over 1 year.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>A convenience sample of non\u2010treatment\u2010seeking youth (age 8\u201017 years) wore actigraphy monitors for 14 days. Average weekly sleep duration, within\u2010person sleep duration variability, weekend catch\u2010up sleep, bedtime and wake time shift, social jet lag, bedtime, wake time, and sleep midpoint were calculated. The association of each facet of baseline sleep with 1\u2010year fat mass, adjusting for baseline fat mass and height, was examined.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>A total of 137 youths (54.0% female; mean [SD], age 12.5 [2.6] years; 28.4% non\u2010Hispanic Black or African American; baseline fat mass = 15.3 [8.9] kg; 1\u2010year fat mass = 17.0 [10.0] kg; 28.5% with baseline overweight or obesity) were studied. Wake time (<jats:italic>p<\/jats:italic> = 0.03) and sleep midpoint (<jats:italic>p<\/jats:italic> = 0.02) were inversely associated with 1\u2010year fat mass, such that earlier wake time and midpoint were associated with higher 1\u2010year fat mass. No other facet of sleep was significantly associated with 1\u2010year fat mass (<jats:italic>p<\/jats:italic> &gt; 0.09).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Using objective measures, youth with earlier wake times and sleep midpoints had greater gains in fat mass. Additional research is needed to determine whether sleep timing may be a modifiable target to prevent pediatric obesity.<\/jats:p><\/jats:sec>","DOI":"10.1002\/oby.23281","type":"journal-article","created":{"date-parts":[[2021,11,4]],"date-time":"2021-11-04T07:09:05Z","timestamp":1636009745000},"page":"1760-1769","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":22,"title":["Longitudinal associations between facets of sleep and adiposity in youth"],"prefix":"10.1002","volume":"29","author":[{"given":"Sarah","family":"LeMay\u2010Russell","sequence":"first","affiliation":[{"name":"Department of Medical and Clinical Psychology Uniformed Services University of the Health Sciences Bethesda Maryland USA"},{"name":"Section on Growth and Obesity Division of Intramural Research Department of Health and Human Services Eunice Kennedy Shriver National Institute of Child Health and Human Development National Institutes of Health Bethesda 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N.","family":"Parker","sequence":"additional","affiliation":[{"name":"Department of Medical and Clinical Psychology Uniformed Services University of the Health Sciences Bethesda Maryland USA"},{"name":"Section on Growth and Obesity Division of Intramural Research Department of Health and Human Services Eunice Kennedy Shriver National Institute of Child Health and Human Development National Institutes of Health Bethesda Maryland USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eliana","family":"Ramirez","sequence":"additional","affiliation":[{"name":"Section on Growth and Obesity Division of Intramural Research Department of Health and Human Services Eunice Kennedy Shriver National Institute of Child Health and Human Development National Institutes of Health Bethesda Maryland USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lisa M.","family":"Shank","sequence":"additional","affiliation":[{"name":"Department of Medical and Clinical Psychology 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