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      Sleep duration and obesity in children: is the association dependent on age and choice of the outcome parameter?

      Sleep

      metabolism, Age Factors, Body Mass Index, Causality, Child, Child, Preschool, Comorbidity, Confounding Factors (Epidemiology), Female, Germany, epidemiology, Health Surveys, Humans, Male, Time Factors, Obesity, physiopathology, Parents, Questionnaires, Sex Distribution, Skinfold Thickness, Sleep, physiology, Sleep Disorders, Adipose Tissue

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          Abstract

          To assess the association between sleep duration in children and different markers of body fat by age and weight status. Nation-wide health survey. Measurement of BMI and body fat percentage (KFA) calculated from weight, height, skin fold thickness, age, and sex. Sleep duration and potential confounding variables were assessed in a parent questionnaire. N/A. 7767 German resident children from 3 to 10 years of age. N/A. Prolongation of sleep duration from the lowest to the highest percentile accounted for a similar mean decrease founding variables and did not show a systematic age dependency. The greatest effects of sleep duration were seen for the upper tails of the BMI and KFA distributions, which were about four as high as the lower tails. The association between sleep duration and weight status is of similar size through ages 3 to 10 years. The sleep-associated changes in BMI are likely to be a consequence of higher body fat and primarily affect children whose BMI or KFA is already elevated. These findings favor hormonal pathways nurturing adipose tissue playing a key role in the underlying physiological mechanisms.

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          19750923
          2737576

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