title: Physical activity throughout adolescence and body composition at 18 years: 1993 Pelotas (Brazil) birth cohort study.
abstract: Adolescence is a period of accelerated development and increases in body composition. Physical activity (PA) practice has been associated with the development of major components of body composition (bone, muscle and fat). However, the longitudinal effects of PA of different intensities during adolescence are still not well understood. Thus, the main goal this study has investigate the association between practice of moderate- and vigorous-intensity physical activity throughout adolescence and body composition, specifically lean mass (LM) and fat mass (FM), at age 18.
  
  
  
  In this cohort study, physical activity was measured at 11, 15 and 18 years, using questionnaires. Thresholds of 300, 150 and 75 min per week, were used for MVPA, moderate- and vigorous-intensity physical activity, respectively. Consistent physical activity was defined as reaching the thresholds at the three follow-ups. FM and LM at age 18 were assessed by DXA and expressed as fat mass (FMI) and lean mass (LMI) indexes. To verify the association between the trajectories of MVPA, moderate- and vigorous-intensity physical activity in adolescence and FM and LM at 18, multivariate analyses were performed through multiple linear regressions adjusted for co-variables.
  
  
  
  A total of 3,176 adolescents were evaluated. The consistent practice of moderate- and vigorous-intensity physical activity according to thresholds during adolescence were directly related to the LMI in boys (moderate-intensity - β = 0.40 and CI95 % 0.13; 0.68 and vigorous-intensity - β = 0.95 and CI95 % 0.69; 1.21) and girls (Moderate-intensity - β = 0.23 and CI95 % 0.02; 0.45 and vigorous-intensity - β = 0.80 and CI95 % 0.29; 1.32). Practice of vigorous-intensity physical activity alone showed to be inversely associated with the FMI in boys (β = -0.53 and CI95 % -0.96;-0.10).
  
  
  
  Consistent physical activity practice during adolescence was associated with greater lean mass in both sexes. In boys, vigorous-intensity physical activity was associated with less fat mass.
authors.affiliation: Graduate Program in Epidemiology, Federal University of Pelotas, Marechal Deodoro, 1160 - 3 Piso, 96020-220, Pelotas, Rio Grande do Sul, Brazil. virgilioramires@hotmail.com.
authors.forename: Virgílio Viana
authors.initials: VV
authors.lastname: Ramires
authors.affiliation: Graduate Program in Public Health, Federal University of Rio Grande, Rio Grande, Brazil.
authors.forename: Samuel Carvalho
authors.initials: SC
authors.lastname: Dumith
authors.affiliation: Graduate Program in Epidemiology, Federal University of Pelotas, Marechal Deodoro, 1160 - 3 Piso, 96020-220, Pelotas, Rio Grande do Sul, Brazil.
authors.forename: Fernando Cesar
authors.initials: FC
authors.lastname: Wehrmeister
authors.affiliation: Graduate Program in Epidemiology, Federal University of Pelotas, Marechal Deodoro, 1160 - 3 Piso, 96020-220, Pelotas, Rio Grande do Sul, Brazil.
authors.forename: Pedro Curi
authors.initials: PC
authors.lastname: Hallal
authors.affiliation: Graduate Program in Epidemiology, Federal University of Pelotas, Marechal Deodoro, 1160 - 3 Piso, 96020-220, Pelotas, Rio Grande do Sul, Brazil.
authors.forename: Ana Maria Baptista
authors.initials: AM
authors.lastname: Menezes
authors.affiliation: Graduate Program in Epidemiology, Federal University of Pelotas, Marechal Deodoro, 1160 - 3 Piso, 96020-220, Pelotas, Rio Grande do Sul, Brazil.
authors.forename: Helen
authors.initials: H
authors.lastname: Gonçalves
mesh_terms: D015502:Absorptiometry, Photon; D000273:Adipose Tissue / Q000378:metabolism*; D000293:Adolescent; D001823:Body Composition / Q000502:physiology*; D001825:Body Fluid Compartments / Q000378:metabolism*; D015992:Body Mass Index; D001938:Brazil; D015331:Cohort Studies; D015444:Exercise / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D009043:Motor Activity / Q000502:physiology; D011795:Surveys and Questionnaires
keywords: Adolescents; Fat mass; Lean mass; Longitudinal studies; Motor activity