This cross-sectional observational study aims to test the original conceptual diagram of the Youth Physical Activity Promotion Model (YPAP) in Brazilian adolescents. The study evaluates the relationships among predisposing, enabling, and reinforcing correlates described in the YPAP framework and investigates how these correlates interact with one another according to the pathways proposed by the model. A convenience sample of adolescents aged 10 to 13 years will be recruited through broad public dissemination as part of a larger experimental intervention project. Data will be collected at a single time point. Instead of traditional linear analytical strategies, the study will adopt complex, flexible, and non-linear methods such as network analysis to examine how correlates interconnect and influence physical activity behavior. Secondary analyses will explore whether the structure and strength of associations differ across demographic subgroups such as sex and socioeconomic level.
age 10-13 years;
medical clearance for physical activity.
presence of any clinical diagnosis that may interfere the performance of assessments (including musculoskeletal, neurological, vascular, pulmonary, or cardiac disorders).
Brazilian adolescents aged 10 to 13 years, recruited through broad public dissemination as part of a larger intervention project.
Other
Cross-sectional
Not listed
Accelerometer-Measured Physical Activity (MVPA)
Minutes per day spent in sedentary, light, moderate, and vigorous intensity, measured using ActiGraph GT3X accelerometers and classified according to Evenson cut-points.
Total Body Mass
Total body mass will be measured using a digital electronic scale Filizola (model ID 1500; capacity: 150 kg; accuracy: 100 g). Measurements will be recorded in kilograms (kg).
Standing and Sitting Height
Standing height will be measured using a vertical stadiometer Sanny (model ES2020; millimetric scale; range up to 2.20 m), with the participant standing barefoot in the orthostatic position and the head aligned in the Frankfurt plane. Values will be recorded in centimeters (cm).
Body Mass Index (BMI)
Body Mass Index (BMI) will be calculated using measured total body mass and standing height, following World Health Organization (WHO) criteria (2007). Participants will be classified according to age- and sex-specific BMI nutritional status categories. Values will be expressed in kg/m².
Stratified network structure by sex
Examination of whether networks of YPAP correlates differ between boys and girls.
Stratified network structure by socioeconomic level
Analysis of networks across socioeconomic categories to determine whether demographic moderators influence YPAP pathways. Socioeconomic status will be classified using the Critério Brasil, developed by the Associação Brasileira de Empresas de Pesquisa (ABEP). The instrument assesses household assets, access to services, and the educational level of the head of household, categorizing participants into economic strata ranging from A to E.
Maturational Status (Maturity Offset / PHV)
Maturational status will be estimated using the Peak Height Velocity (PHV) prediction equation (Maturity Offset), which uses anthropometric variables including standing height, body mass, sitting height, leg length, chronological age, and sex. The method provides an estimate, in years, of the time before or after the individual's PHV.
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Hospital Universitario Pedro Ernesto
Lead sponsor
Rio de Janeiro State Research Supporting Foundation (FAPERJ)
Collaborator
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