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Sedentary Behavior and Cardiometabolic Health Associations in Obese 11-13-Year Olds.

ABSTRACT: Improved understanding of sedentary time's impact on cardiometabolic health can help prioritize intervention targets.We investigated cross-sectional and longitudinal relations of reported screen time and objectively measured total percent of time spent sedentary with cardiometabolic health in obese youth.Participants were 106 obese adolescents age 11-13 (N?=?106, 51% girls, and 82% Hispanic) recruited from primary care clinics in southern California. Main predictor measures were child-reported screen time and objectively assessed sedentary time. Outcome measures were body mass index (BMI), waist and hip circumference, body fat, blood pressure, glucose, triglycerides, insulin, cholesterol, aspartate aminotransferase (AST), and serum alanine aminotransferase (ALT).Total percent sedentary time was not associated with the cardiometabolic health markers after adjusting for moderate-to-vigorous physical activity (MVPA). However, screen time was positively associated with BMI and diastolic blood pressure at baseline, and positive longitudinal associations were found with BMI, triglycerides, low-density lipoprotein, AST, and ALT.Reported screen time, but not total sedentary time, was related to multiple cardiometabolic health markers in obese adolescents, independent of MVPA. The findings suggest that limiting and replacing screen time, which was more than 3 hours per day on average in this sample, is likely an important behavior change strategy for interventions treating childhood obesity and comorbidities. The associations with screen time were strongest with AST and ALT, suggesting that this form of sedentary behavior may impact liver health.

SUBMITTER: Norman GJ

PROVIDER: S-EPMC5647486 | biostudies-literature | 2017 Oct

REPOSITORIES: biostudies-literature

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Sedentary Behavior and Cardiometabolic Health Associations in Obese 11-13-Year Olds.

Norman Gregory J GJ Carlson Jordan A JA Patrick Kevin K Kolodziejczyk Julia K JK Godino Job G JG Huang Jeannie J Thyfault John J

Childhood obesity (Print) 20170602 5

<h4>Background</h4>Improved understanding of sedentary time's impact on cardiometabolic health can help prioritize intervention targets.<h4>Objective</h4>We investigated cross-sectional and longitudinal relations of reported screen time and objectively measured total percent of time spent sedentary with cardiometabolic health in obese youth.<h4>Methods</h4>Participants were 106 obese adolescents age 11-13 (N = 106, 51% girls, and 82% Hispanic) recruited from primary care clinics in southern Cali ...[more]

PMID: 28574759

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Project description:ObjectiveTo examine the associations of sedentary time and physical activity with biomarkers of cardiometabolic health, including the potential collective impact of shifting mean time use from less- to more-active behaviours (cross-sectionally, using isotemporal substitution), in adults with type 2 diabetes.MethodsParticipants with overweight/obese body mass index (BMI; ≥25 kg/m2) (n = 279; 158 men, mean [SD] age = 58.2 [8.6] years) wore Actigraph GT1M accelerometers (waking hours; seven days) to assess moderate- to vigorous-intensity physical activity (MVPA), light-intensity activity, and sedentary time (segregated into non-prolonged [accumulated in bouts <30min] and prolonged [accumulated in bouts ≥30 min]). Cross-sectional associations with waist circumference, BMI, fasting blood (HbA1c, glucose, triacylglycerols, high-density lipoprotein cholesterol), and blood pressure of these activity variables (30 min/day increments) were examined adjusted for confounders and wear then, if significant, examined using isotemporal substitution modelling.ResultsWaist circumference and BMI were significantly (p<0.05) associated with more prolonged sedentary time and less light-intensity activity. Light intensity activity was also significantly associated with lower fasting plasma glucose (relative rate: 0.98, 95% CI: 0.97, 1.00; p<0.05). No biomarker was significantly associated with non-prolonged sedentary time or MVPA. Lower mean prolonged sedentary time (-30 min/day) with higher mean light intensity time (+30 min/day) was significantly associated with lower waist circumference (β = -0.77, 95% CI: -1.33, -0.22 cm). Lower mean prolonged sedentary time (-30 min/day) with either 30 min/day higher mean non-prolonged sedentary time (β = -0.35, 95%CI: -0.70, -0.01 kg/m2) or light-intensity time (β = -0.36, -0.61, -0.11 kg/m2) was associated with significantly lower average BMI.ConclusionsSignificantly improved mean levels of waist circumference and BMI were observed when shifting time from prolonged sedentary to non-prolonged sedentary or light-intensity activity (cross-sectionally). Lifestyle interventions in overweight/obese adults with type 2 diabetes might consider targeting shifts in these non-MVPA activities to more rigorously evaluate their potential cardiometabolic benefit in this population.

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Dataset Information

Sedentary Behavior and Cardiometabolic Health Associations in Obese 11-13-Year Olds.

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Sedentary Behavior and Cardiometabolic Health Associations in Obese 11-13-Year Olds.

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