| Autor: |
Silva BGCD; Postgraduate Program in Epidemiology, Federal University of Pelotas, 96020-220, Pelotas, Brazil. brugcs@hotmail.com., Silva ICMD; Postgraduate Program in Epidemiology, Federal University of Pelotas, 96020-220, Pelotas, Brazil.; Postgraduate Program in Physical Education, Federal University of Pelotas, 96055-630, Pelotas, Brazil., Ekelund U; Department of Sports Medicine, Norwegian School of Sports Sciences, Oslo, 0863, Norway., Brage S; Medical Research Council Epidemiology Unit, University of Cambridge, Cambridge, CB20QQ, United Kingdom., Ong KK; Medical Research Council Epidemiology Unit, University of Cambridge, Cambridge, CB20QQ, United Kingdom., De Lucia Rolfe E; Medical Research Council Epidemiology Unit, University of Cambridge, Cambridge, CB20QQ, United Kingdom., Lima NP; Postgraduate Program in Epidemiology, Federal University of Pelotas, 96020-220, Pelotas, Brazil., Silva SGD; Postgraduate Program in Epidemiology, Federal University of Pelotas, 96020-220, Pelotas, Brazil., França GVA; Secretariat of Health Surveillance, Brazilian Ministry of Health, Brasília, 70719-040, Brazil., Horta BL; Postgraduate Program in Epidemiology, Federal University of Pelotas, 96020-220, Pelotas, Brazil. |
| Abstrakt: |
The findings of studies on the association between physical activity and adiposity are not consistent, and most are cross-sectional and used only self-reported measures. The aims of this study were to evaluate: 1) independent and combined cross-sectional associations of objectively-measured physical activity and sedentary time with body composition outcomes at 30 years, and 2) prospective associations of changes in self-reported physical activity from 23 to 30 years with the same outcomes in participants from the 1982 Pelotas (Brazil) Birth Cohort. Body mass index, waist circumference, visceral abdominal fat, fat mass index, and android/gynoid fat ratio were the outcomes. 3,206 participants were analysed. In cross-sectional analyses, higher objectively-measured moderate-to-vigorous physical activity was associated with lower body mass index (β = 0.017, 95%CI: -0.026; -0.009), waist circumference (β = -0.043, 95%CI: -0.061; -0.025), visceral abdominal fat (β = -0.006, 95%CI: -0.009; -0.003), and fat mass index (β = -0.015, 95%CI: -0.021; -0.009), independent of sedentary time. Sedentary time was independently associated only with higher fat mass index (β = 0.003, 95%CI: 0.001; 0.005). In longitudinal analyses, using self-reported measure, adiposity was lower among those who were consistently active or who became active. Adiposity was similar among the "became inactive" and "consistently inactive" subjects. Our findings suggest metabolic benefits from engagement in physical activity throughout young adulthood, with stronger associations on concurrent levels. |
