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Physical Activity and Adiposity in a Racially Diverse Cohort of US Infants

OBJECTIVE: Early life physical activity may help prevent obesity, but objective quantification in infants is challenging. METHODS: A total of 506 infants were examined from 2013 to 2016. Infants wore accelerometers for 4 days at ages 3, 6, 9, and 12 months. Daily log‐transformed physical activity co...

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Detalles Bibliográficos
Autores principales: Benjamin‐Neelon, Sara E., Bai, Jiawei, Østbye, Truls, Neelon, Brian, Pate, Russell R., Crainiceanu, Ciprian
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7042075/
https://www.ncbi.nlm.nih.gov/pubmed/31944621
http://dx.doi.org/10.1002/oby.22738
Descripción
Sumario:OBJECTIVE: Early life physical activity may help prevent obesity, but objective quantification in infants is challenging. METHODS: A total of 506 infants were examined from 2013 to 2016. Infants wore accelerometers for 4 days at ages 3, 6, 9, and 12 months. Daily log‐transformed physical activity counts were computed, averaged, and standardized across assessments. A linear mixed model was used to examine trends in standardized physical activity counts as well as associations between physical activity and BMI z score, sum of subscapular and triceps skinfold thickness for overall adiposity (SS+TR), and their ratio for central adiposity (SS:TR). RESULTS: Among infants, 66% were black and 50% were female. For each additional visit, standardized physical activity counts increased by 0.23 (CI: 0.18 to 0.27; P < 0.0001). This translates to 126.3 unadjusted physical activity counts or a 4% increase for each visit beyond 3 months. In addition, a 1‐SD increase in standardized physical activity counts (550 unadjusted physical activity counts) was associated with a 0.01‐mm lower SS:TR (95% CI: −0.02 to −0.001; P = 0.03). However, standardized physical activity counts were not associated with BMI z score or SS+TR. CONCLUSIONS: Physical activity increased over infancy and was associated with central adiposity. Despite limitations, researchers should consider objective measurement in infants.