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Summary   Objective  Investigate associations of  TV  viewing time and accelerometry‐derived sedentary time with inflammatory and endothelial function biomarkers in children.    Methods  Cross‐sectional analysis of 164 7–10‐year‐old children.  TV  viewing time was assessed by parental proxy report and total and patterns of sedentary time accumulation (e.g. prolonged bouts) were assessed by accelerometry.  C ‐reactive protein ( CRP ), homeostasis model assessment of insulin resistance, interleukin‐2, ‐6, ‐8, ‐10, tumour necrosis factor alpha, adiponectin, resistin, brain‐derived neurotrophic factor, soluble intercellular and vascular adhesion molecule 1, plasminogen activator inhibitor 1 and soluble E‐selectin were assessed. Generalised linear models assessed the associations of  TV  viewing and sedentary time with biomarkers, adjusting for sex, waist circumference, moderate‐ to vigorous‐intensity physical activity and diet density.    Results  Each additional h week −1  of  TV  viewing was associated with 4.4% (95%  CI : 2.1, 6.7) greater  CRP  and 0.6% (0.2, 1.0) greater  sVCAM ‐1 in the fully adjusted model. The association between frequency and duration of 5–10 min bouts of sedentary time and  CRP  was positive after adjustment for sex and waist circumference but attenuated after adjustment for diet density.    Conclusions  This study suggests that  TV  viewing was unfavourably associated with several markers of inflammation and endothelial dysfunction. The detrimental association between 5 and 10 min bouts of sedentary time and  CRP  approached significance, suggesting that further research with a stronger study design (longitudinal and/or experimental) is needed to better understand how the accumulation of sedentary time early in life may influence short and longer term health.

Associations of sedentary time patterns and TV viewing time with inflammatory and endothelial function biomarkers in children