Randomized controlled trial assessing the effects of a 12-week recreational football program on behavioral, psychosocial, environmental, and physical determinants of physical activity in male adolescents aged 10-13 years.
male adolescents;
age 10-13 years;
medical clearance for physical activity;
availability for 12-week intervention.
presence of any clinical diagnosis that may interfere the performance of assessments or the intervention (including musculoskeletal, neurological, vascular, pulmonary, or cardiac disorders);
attendance < 85% of sessions (intervention group).
Parallel
Recreational Football Program
BehavioralThe intervention consists of a 12-week recreational football program delivered twice per week at the university's outdoor soccer field. Each 60-minute session includes a 10-minute warm-up followed by 50 minutes of small-sided, game-based football activities. Sessions are led by two trained coaches and an assistant under the supervision of the principal investigator. Heart rate is monitored using Polar H10 sensors, and a subsample of participants is tracked with GPS devices (GPEXE System) to quantify total distance and intensity zones. At the end of each session, participants report ratings of perceived exertion (Borg CR-10 Scale) and exercise enjoyment, providing immediate physiological and psychological response markers.
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). Sitting height will be measured with the participant seated on a rigid bench of known height, hips and knees flexed at 90°, buttocks and posterior thighs supported, and 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.
Waist Circumference
Waist circumference will be measured using a metal measuring tape. Values will be recorded in centimeters (cm).
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.
Socioeconomic Level (Critério Brasil)
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.
School Physical Education Participation and Sports History
Information on school physical education participation and sports history will be collected using structured questions. Items will assess the number and duration of weekly physical education classes, the adolescent's level of active participation, and their sports history over the past five years, including type of activity, frequency, duration, and length of practice.
Sleep Characteristics (Structured Questions)
Sleep characteristics will be assessed using structured questions addressing typical sleep behaviors. Items will include usual bedtime, wake-up time, total sleep duration, sleep quality, difficulties initiating or maintaining sleep, and daytime tiredness. Responses will be used to characterize changes in sleep patterns before and after the intervention.
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Hospital Universitario Pedro Ernesto
Lead sponsor
Rio de Janeiro State Research Supporting Foundation (FAPERJ)
Collaborator
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