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      Associations of TV Viewing Duration, Meals and Snacks Eaten When Watching TV, and a TV in the Bedroom with Child Adiposity

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          Abstract

          Objective

          This study aimed to examine the associations of TV parameters with adiposity in early life.

          Methods

          Data were collected as part of the Born in Bradford (BiB) longitudinal birth cohort study. Child TV viewing duration was parent reported, and BMI, the sum of triceps and subscapular skinfolds, and waist circumference were measured at ~12, 18, 24, and 36 months of age in 1,338 children. Mixed effects models were used to quantify adjusted associations of TV viewing duration with adiposity markers, incorporating data from all time points. Linear regression was used to investigate differences in adiposity levels across frequencies of eating meals and snacks while watching TV at age ~24 months and between children who did and did not have a TV in their bedroom at age ~36 months.

          Results

          Every 1 h/d of TV viewing was associated with a 0.075‐cm larger (95% CI: 0.0034‐0.15) waist circumference, independent of covariates including sleep duration, dietary factors, and physical activity level. There was no evidence for any other associations.

          Conclusions

          TV viewing duration is independently associated with abdominal adiposity in young children. Limiting TV viewing from an early age may be important for primary prevention of obesity.

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          Most cited references27

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          Sedentary behaviour and adiposity in youth: a systematic review of reviews and analysis of causality

          Background Sedentary behaviour (sitting time) has becoming a very popular topic for research and translation since early studies on TV viewing in children in the 1980s. The most studied area for sedentary behaviour health outcomes has been adiposity in young people. However, the literature is replete with inconsistencies. Methods We conducted a systematic review of systematic reviews and meta-analyses to provide a comprehensive analysis of evidence and state-of-the-art synthesis on whether sedentary behaviours are associated with adiposity in young people, and to what extent any association can be considered ‘causal’. Searches yielded 29 systematic reviews of over 450 separate papers. We analysed results by observational (cross-sectional and longitudinal) and intervention designs. Results Small associations were reported for screen time and adiposity from cross-sectional evidence, but associations were less consistent from longitudinal studies. Studies using objective accelerometer measures of sedentary behaviour yielded null associations. Most studies assessed BMI/BMI-z. Interventions to reduce sedentary behaviour produced modest effects for weight status and adiposity. Accounting for effects from sedentary behaviour reduction alone is difficult as many interventions included additional changes in behaviour, such as physical activity and dietary intake. Analysis of causality guided by the classic Bradford Hill criteria concluded that there is no evidence for a causal association between sedentary behaviour and adiposity in youth, although a small dose-response association exists. Conclusions Associations between sedentary behaviour and adiposity in children and adolescents are small to very small and there is little to no evidence that this association is causal. This remains a complex field with different exposure and outcome measures and research designs. But claims for ‘clear’ associations between sedentary behaviour and adiposity in youth, and certainly for causality, are premature or misguided.
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            A review of preschool children's physical activity and sedentary time using objective measures.

            Identifying current physical activity levels and sedentary time of preschool children is important for informing government policy and community initiatives. This paper reviewed studies reporting on physical activity and time spent sedentary among preschool-aged children (2-5 years) using objective measures.
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              Physical activity intensity, sedentary time, and body composition in preschoolers.

              Detailed associations between physical activity (PA) subcomponents, sedentary time, and body composition in preschoolers remain unclear. We examined the magnitude of associations between objectively measured PA subcomponents and sedentary time with body composition in 4-y-old children. We conducted a cross-sectional study in 398 preschool children recruited from the Southampton Women's Survey. PA was measured by using accelerometry, and body composition was measured by using dual-energy X-ray absorptiometry. Associations between light physical activity, moderate physical activity (MPA), vigorous physical activity (VPA), and moderate-to-vigorous physical activity (MVPA) intensity; sedentary time; and body composition were analyzed by using repeated-measures linear regression with adjustment for age, sex, birth weight, maternal education, maternal BMI, smoking during pregnancy, and sleep duration. Sedentary time and PA were also mutually adjusted for one another to determine whether they were independently related to adiposity. VPA was the only intensity of PA to exhibit strong inverse associations with both total adiposity [P < 0.001 for percentage of body fat and fat mass index (FMI)] and abdominal adiposity (P = 0.002 for trunk FMI). MVPA was inversely associated with total adiposity (P = 0.018 for percentage of body fat; P = 0.022 for FMI) but only because of the contribution of VPA, because MPA was unrelated to fatness (P ≥ 0.077). No associations were shown between the time spent sedentary and body composition (P ≥ 0.11). In preschoolers, the time spent in VPA is strongly and independently associated with lower adiposity. In contrast, the time spent sedentary and in low-to-moderate-intensity PA was unrelated to adiposity. These results indicate that efforts to challenge pediatric obesity may benefit from prioritizing VPA.
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                Author and article information

                Contributors
                paul.collings@bthft.nhs.uk
                Journal
                Obesity (Silver Spring)
                Obesity (Silver Spring)
                10.1002/(ISSN)1930-739X
                OBY
                Obesity (Silver Spring, Md.)
                John Wiley and Sons Inc. (Hoboken )
                1930-7381
                1930-739X
                30 September 2018
                October 2018
                : 26
                : 10 ( doiID: 10.1002/oby.2018.26.issue-10 )
                : 1619-1628
                Affiliations
                [ 1 ] Bradford Institute for Health Research, Bradford Teaching Hospitals NHS Foundation Trust Bradford UK
                [ 2 ] Department of Health Sciences University of York UK
                Author notes
                [*] [* ] Correspondence: Paul Collings ( paul.collings@ 123456bthft.nhs.uk )

                Author information
                http://orcid.org/0000-0003-2022-5453
                Article
                OBY22288
                10.1002/oby.22288
                6207926
                30269425
                f9b97a5e-52e6-49b4-9f0b-1849a6507be2
                © 2018 The Authors Obesity published by Wiley Periodicals, Inc. on behalf of The Obesity Society (TOS)

                This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

                History
                : 25 April 2018
                : 16 July 2018
                Page count
                Figures: 3, Tables: 4, Pages: 10, Words: 16906
                Funding
                Funded by: Medical Research Council
                Award ID: MR/K021656/1
                Award ID: MR/N024397/1
                Funded by: Economic and Social Research Council
                Award ID: MR/N024397/1
                Funded by: British Heart Foundation
                Award ID: CS/16/4/32482
                Award ID: FS/17/37/32937
                Funded by: NIHR Clinical Research Network
                Funded by: Programme Grants for Applied Research
                Funded by: Wellcome Trust
                Award ID: WT101597MA
                Funded by: National Institute for Health Research
                Categories
                Original Article
                Original Articles
                Pediatric Obesity
                Custom metadata
                2.0
                oby22288
                October 2018
                Converter:WILEY_ML3GV2_TO_NLMPMC version:version=5.5.1 mode:remove_FC converted:31.10.2018

                Medicine
                Medicine

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