SLEEP DURATION, DIETARY INTAKE AND SEDENTARY BEHAVIOUR IN BRAZILIAN TEENS: THE LONCAAFS STUDY

Background and objectives: Introduction. Studies suggest that the association between increased variability of hours of sleep and abdominal obesity can be explained by the energy intake, with special attention to carbohydrates and fats. Sedentary behavior linked to screen time has been strongly associated with sleep behavior disorders. Objective. To describe the relationship between sleep duration, sedentary behavior and macronutrients dietary intake in adolescents aged 10 to 14 years old from João Pessoa, Paraíba, Brazil. Methods: Design. Cross-sectional study developed with 1384. The data analyzed in this study are part of the first year (2014) collection of Longitudinal Study Sedentary Behavior, Physical Activity, Eating Habits and Health of Adolescents - The Loncaafs Study. Based on information of a whole week (week and weekend), sleep duration was measured as the mean difference between the time to sleep and wake up. The time spent sited in a week represented the sedentary behavior. More than 100 minutes sited/day was considered sedentary. The consumption of macronutrients was rated by two 24hours recalls. Linear regression models were used to assess the relationship between sleep duration with diet and sedentary behavior. Results: The sample comprised 54% of girls, with a mean age of 11.9 years old. The prevalence of sedentary behavior was 76.2%, being sited, in mean, for 243 minutes/day. The average calorie intake was 2226.90 kcal and the macronutrients were on average within the recommended for the age group studied. There was a negative association between sleep duration and the consumption of saturated fats only for girls and negative between sleep duration and sedentary behavior in both sexes. Conclusion: Sleep duration was negatively associated with the consumption of saturated fat in girls and sedentary behavior in both sexes.