title: The Oporto mixed-longitudinal growth, health and performance study. Design, methods and baseline results.
abstract: BACKGROUND
  Studies concerning child and adolescent growth, development, performance and health aimed at the multiple interactions amongst this complex set of variables are not common in the Portuguese speaking countries.
  
  
  OBJECTIVE
  The aim of this paper is to address the key ideas, methodology and design of the Oporto Growth, Health and Performance Study (OGHPS).
  
  
  METHODS
  The OGHPS is a multidisciplinary mixed-longitudinal study whose main purpose is to examine the multiple interactions among biological, environmental and lifestyle indicators that affect growth, development, health and performance of Portuguese adolescents aged 10-18 years old.
  
  
  RESULTS
  This study briefly presents baseline results for growth, physical fitness and lifestyle behaviours for those participating in the cross-sectional sample (n ≈ 8000). Approximately 30% were over-fat or obese. On average, boys were more physically fit and active than girls. Few adolescents meet the guidelines for sleep duration (≈10%) and eating habits (16.2-24.8%), while 76-85% meet the recommended levels of moderate-to-vigorous physical activity.
  
  
  CONCLUSIONS
  The OGHPS has an innovative approach due to its mixed-longitudinal design and the broad array of variables. Furthermore, subsequent analyses of the longitudinal data will enable a detailed exploration of important factors affecting the growth trajectories of health and performance variables and will also help to identify some of the most opportune times for interventions in terms of health behaviours.
authors.affiliation: a Department of Physical Education , Center of Sports, Federal University of Santa Catarina, Campus Universitário, Trindade , Florianópolis , SC , Brazil.|b CAPES Foundation, Ministry of Education of Brazil, Setor Bancário Norte , Quadra 2, Bloco L , Brasília , DF , Brazil.
authors.forename: Michele Caroline de
authors.initials: MC
authors.lastname: Souza
authors.affiliation: c Federal University of Technology of Paraná, Avenida Sete de Setembro , Curitiba , Paraná , Brazil.
authors.forename: Raquel Nichele de
authors.initials: RN
authors.lastname: Chaves
authors.affiliation: d Department of Physical Education , Federal University of Viçosa, Campus Universitário , Viçosa , MG , Brazil.
authors.forename: Fernanda Karina
authors.initials: FK
authors.lastname: Dos Santos
authors.affiliation: e CIFI2D, Faculty of Sport, University of Porto , Rua Dr. Plácido Costa, 91 , Porto , Portugal.
authors.forename: Thayse Natacha Queiroz Ferreira
authors.initials: TN
authors.lastname: Gomes
authors.affiliation: e CIFI2D, Faculty of Sport, University of Porto , Rua Dr. Plácido Costa, 91 , Porto , Portugal.
authors.forename: Daniel Vilhena E
authors.initials: DV
authors.lastname: Santos
authors.affiliation: e CIFI2D, Faculty of Sport, University of Porto , Rua Dr. Plácido Costa, 91 , Porto , Portugal.
authors.forename: Alessandra Silva
authors.initials: AS
authors.lastname: Borges
authors.affiliation: e CIFI2D, Faculty of Sport, University of Porto , Rua Dr. Plácido Costa, 91 , Porto , Portugal.
authors.forename: Sara Isabel Sampaio
authors.initials: SI
authors.lastname: Pereira
authors.affiliation: f Exercise Hemodynamic Laboratory, School of Physical Education and Sport , University of São Paulo , Avenida Prof. Mello Moraes, 65 Cidade Universitária , São Paulo , Brazil.
authors.forename: Cláudia Lúcia de Moraes
authors.initials: CL
authors.lastname: Forjaz
authors.affiliation: g Department of Radiology , Michigan State University , East Lansing , MI , USA.
authors.forename: Joey
authors.initials: J
authors.lastname: Eisenmann
authors.affiliation: e CIFI2D, Faculty of Sport, University of Porto , Rua Dr. Plácido Costa, 91 , Porto , Portugal.
authors.forename: José António Ribeiro
authors.initials: JA
authors.lastname: Maia
mesh_terms: D050154:Adiposity; D000293:Adolescent; D000886:Anthropometry; D001835:Body Weight; D000072599:Cardiorespiratory Fitness; D002648:Child; D002657:Child Development / Q000502:physiology*; D015444:Exercise; D005260:Female; D006262:Health; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D010809:Physical Fitness / Q000502:physiology*; D011174:Portugal; D015995:Prevalence; D015203:Reproducibility of Results; D012107:Research Design; D018401:Sample Size
keywords: Auxology; epidemiology; longitudinal studies; sport science; youth