{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,19]],"date-time":"2026-01-19T09:09:43Z","timestamp":1768813783120,"version":"3.49.0"},"reference-count":36,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2013,4,16]],"date-time":"2013-04-16T00:00:00Z","timestamp":1366070400000},"content-version":"vor","delay-in-days":46,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"name":"Spanish Ministry of Education","award":["EX-2009-0899"],"award-info":[{"award-number":["EX-2009-0899"]}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Obesity"],"published-print":{"date-parts":[[2013,3]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Objective:<\/jats:title><jats:p>The purpose of this study is to determine whether time spent in objectively measured physical activity is associated with change in body mass index (BMI) from ages 9 to 15.<\/jats:p><\/jats:sec><jats:sec><jats:title>Design and Methods:<\/jats:title><jats:p>The participants were enrolled in the National Institute of Child Health and Human Development Study of Early Child Care and Youth Development (<jats:italic>n<\/jats:italic> = 938). At ages 9, 11, 12, and 15 the time spent in moderate\u2010to\u2010vigorous physical activity (MVPA) was objectively measured, and BMI was calculated (kg\/m<jats:sup>2<\/jats:sup>). Longitudinal quantile regression was used to analyze the data. The 10th, 25th, 50th, 75th, and 90th BMI percentiles were modeled as the dependent variables with age and MVPA (h\/day) modeled as predictors. Adjustment was also made for gender, race, sleep, healthy eating score, maternal education, and sedentary behavior.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results:<\/jats:title><jats:p>A negative association between MVPA and change in BMI was observed at the 90th BMI percentile (\u22123.57, 95% CI \u22125.15 to \u22121.99 kg\/m<jats:sup>2<\/jats:sup> per hour of MVPA). The negative association between time spent in MVPA and change in BMI was progressively weaker toward the 10th BMI percentile (\u22120.27, 95% CI \u22120.62 to 0.07 kg\/m<jats:sup>2<\/jats:sup> per hour of MVPA). The associations remained similar after adjusting for the covariates, and when the analyses were stratified by gender.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion:<\/jats:title><jats:p>Time spent in MVPA was negatively associated with change in BMI from age 9 to 15. The association was strongest at the upper tail of the BMI distribution, and increasing time spent in MVPA could help reduce the prevalence of childhood obesity.<\/jats:p><\/jats:sec>","DOI":"10.1002\/oby.20118","type":"journal-article","created":{"date-parts":[[2013,4,17]],"date-time":"2013-04-17T06:54:59Z","timestamp":1366181699000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":43,"title":["Moderate\u2010To\u2010vigorous physical activity is associated with decreases in body mass index from ages 9 to 15 years"],"prefix":"10.1002","volume":"21","author":[{"given":"J. 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