Tempo total e bouts de comportamento sedentário e atores de risco para síndrome matabólica em adolescentes

Abstract

Excessive sedentary behavior has been associated with poor health, and may increase the risk of an unfavorable profile in metabolic syndrome risk factors and score. Investigations with adolescents are scarce with respect to the relationship between total time and bouts of sedentary behavior and metabolic syndrome risk factors and score. OBJECTIVE: The objective of this study was to analyze the associations between total time and bouts of sedentary behavior and metabolic syndrome risk factors and score in adolescents from João Pessoa, Paraiba (PB) state, Brazil. METHODS: This is a school-based cross-sectional epidemiological study that analyzed data collected in the first year (2014) of the Longitudinal Study on Sedentary Behavior, Physical Activity, Food Habits and Health of Adolescents – LONCAAFS study. We analyzed data from a subsample of 572 adolescents (53.3% female) aged between 10 and 14 years, enrolled in Fundamental II (grades 6-9) of the public school system in João Pessoa (PB). Sedentary behavior was measured using an Actigraph GT3X accelerometer, mean time was estimated in hours and mean number of bouts per day of sedentary behavior was recorded. The metabolic syndrome risk factors analyzed were: glucose, HDL-c, triglycerides and systolic and diastolic pressure. The metabolic syndrome risk score was determined from the sum of z-scores of these factors. Crude and adjusted linear regression was used to analyze the relationship between total time and the mean number of bouts per day of sedentary behavior and metabolic syndrome risk factors and score. RESULTS: Adjusted analysis demonstrated that total time spent in sedentary behavior was not associated (p>0.05) with metabolic syndrome risk factors and score. In males, the mean number of 1 to-4-minute bouts was inversely associated with glucose (ß = -0.215; 95%CI: -0.376; - 0.054), systolic blood pressure (ß = -0.202; 95%CI: -0.341; - 0.063), diastolic blood pressure (ß = -0.131; 95%CI: -0.247; - 0.015) and metabolic syndrome risk score (ß = -0.074; 95%CI: -0.124; - 0.025). In females, the mean number of 15 to-30-minute bouts was positively associated with diastolic blood pressure (ß = 0.591; 95%CI: 0.018; 1.165) and the mean number of 5 to-9-minute bouts was inversely associated with the metabolic syndrome risk score (ß = -0.096; 95%CI: -0.180; -0.012). CONCLUSION: Total sedentary behavior time showed no relationship with metabolic syndrome factors and score. Short-duration bouts are inversely associated with metabolic syndrome factors and score, but long-duration bouts seem to promote unfavorable alterations in metabolic syndrome risk factors.