Abstract

CONTEXT AND OBJECTIVE: Physical education classes aim to promote health but it is unknown whether benefits occur independently of sports practice. The purpose of this study was to examine associations between engagement in physical education classes and physical fitness and obesity according to sports practice among Brazilian students. DESIGN AND SETTING: Cross-sectional school-based study involving 737 students aged 10-17 years in southern Brazil. METHODS: Engagement in physical education classes and sports practice were analyzed using a self-report questionnaire. The health indicators analyzed were cardiorespiratory fitness, muscle strength, obesity and combinations thereof. The covariates were sex, age, socioeconomic status, physical activity and sedentary behavior. Prevalence ratios (PR) adjusted for confounding variables were estimated using Poisson regression. Analyses were stratified according to sports practice. RESULTS: Engagement in physical education classes was associated with achievement of health-related criteria for cardiorespiratory fitness (PR = 1.52), muscle strength (PR = 1.55), obesity + cardiorespiratory fitness (PR = 1.51), obesity + muscle strength (PR = 1.70), cardiorespiratory fitness + muscle strength (PR = 2.60) and the three outcomes combined (PR = 2.43), only among non-sports practitioners, all P < 0.05. Engagement in physical education classes was not associated with obesity (PR = 1.00, P > 0.05). No associations were found for sports practitioners (P > 0.05).

Objective: To analyze the association between participation and physical activity during Physical Education classes with health outcomes in Brazilian students.Methods: 681 Brazilian students (50.5% female) aged 10 to 17 years participated in this cross-sectional study. Independent variables analyzed were participation and physical activity during Physical Education classes, both assessed using a self-report questionnaire. The outcomes were: cardiorespiratory fitness (20-meter Shuttle Run test), muscle strength (Push-up test), overweight and obesity (body mass index) and high blood pressure. Statistical analysis was conducted by Poisson regression to estimate the prevalence ratio (PR) and 95% confidence intervals (95%CI) adjusted for confounding variables (age, sex, parental education, physical activity and sedentary behavior), considering the complex sample design.Results: Participation in Physical Education classes was not associated with any of the studied variables. Being active during Physical Education classes was associated with achieving health related criteria for cardiorespiratory fitness (PR=1.34, 95%CI 1.16-1.55) and muscle strength (PR=1.36, 95%CI 1.09-1.71). The same did not occur for overweight (PR=1.04, 95%CI 0.95-1.14), obesity (PR=1.02, 95%CI 0.91-1.05), or high blood pressure (PR=0.98, 95%CI 0.90-1.06).Conclusions: Students who reported being active during classes presented a higher likelihood to achieve the health criteria for cardiorespiratory fitness and muscle strength. However, classes traditionally offered in Brazil do not protect students from overweight, obesity, or high blood pressure.

RESUMOIntrodução: Há alta prevalência de jovens que não atendem ao critério de saúde para aptidão cardiorrespiratória, o que os expõe a riscos relacionados à saúde metabólica, cardiovascular e mental. Dessa forma, é relevante investigar quais aspectos estão associados à aptidão cardiorrespiratória de jovens. Objetivo: Analisar os fatores associados à aptidão cardiorrespiratória em escolares. Métodos: Estudo transversal que envolveu 736 escolares (50,1% do sexo feminino) com idade entre 10 a 18 anos. Foram analisadas a condição socioeconômica, escolaridade paterna, número de irmãos, percepção de atividade física, atividade física moderada a vigorosa, participação nas aulas de educação física, prática esportiva, local para prática, transporte ativo e comportamento sedentário. Foram coletadas medidas de estatura, massa corporal e realizado um teste de aptidão cardiorrespiratória. Para estimar a razão de prevalência (RP) e os intervalos de confiança de 95% foi utilizada a regressão Descritores: aptidão física; atividade motora; educação física e treinamento; sobrepeso; adolescente. (PR = 0.79, overweight (PR = 0.73,, physical activity perception equal to persons of the same age (PR = 1.26,, weekly physical activity , participation in physical education classes (PR = 1.35,, and sedentary behavior ≥ 2h (RP = 0.82,. With respect to students aged 14 years or more, female sex (PR = 0.35, overweight (PR = 0.25,, practicing sports a few times (PR = 1.96,) and frequently (PR =2.09, ABSTRACT

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(PR = 1,60,1,52 and 1,93,1,25) and on non sport practitioners (RP = 1,80,1,14 and 2,15,1,16). For young people sports practitioners were not found associations between overweight and obesity with HBP (PR = 1,01, 0,82 and 1,09, 0,48

The purpose of the present study was to analyze if the association between sex with cardiorespiratory and muscular fitness is independent of physical activity, sports practice and sedentary behavior in young people. A cross-sectional study involving 729 participants aged 10 to 17 years. Physical activity, sports practice and sedentary behavior were assessed through a questionnaire. Cardiorespiratory fitness was measured using 20m shuttle run test and were analyzed: VO2max, number of laps and health-related criteria. Muscular fitness was assessed with 90o push-up test and number of repetition and health-related criteria was analyzed. Multiple linear regression was used to estimate β coeficients and Poisson regression estimated prevalence ratios (PR). Male sex was associated to higher cardiorespiratory fitness (VO2max β = 9.04 to 9.77, Laps PR=1.67 to 1.80, health-related criteria PR=2.03 to 2.09) and the same occurred with muscular fitness (repetitions PR=2.81 to 3.01, health-related criteria PR=1.91 to 2.09). Similarly, the stratification of the sample according to physical activity, sports practice and sedentary behavior did not change the associations between sex with cardiorespiratory (VO2max β=8.07 to 10.00, Laps PR=1.49 to 1.85, health-related criteria PR=1.64 to 2.27) and muscular fitness (repetitions PR=2.24 to 3.22, health-related criteria PR=1.76 to 2.06). These data suggest that higher cardiorespiratory and muscular fitness in males could not be attributed to physical activity, sports practice or sedentary behavior in young people.

Objective:To analyze the agreement between two cutoff points for physical activity (300 and 420 minutes/week) and associated factors in youth.Methods:The study enrolled 738 adolescents of Londrina city, Paraná, Southern Brazil. The following variables were collected by a self report questionnaire: presence of moderate to vigorous physical activity, gender, age, father and mother education level, with whom the adolescent lives, number of siblings, physical activity perception, participation in Physical Education classes, facilities available to physical activity practice and sedentary behavior. Prevalence of physical activity between criterions were compared using McNemar test and the agreement was analysed by Kappa index. Multivariate analysis was performed using Poisson regression with robust variance adjustment was applied.Results:The prevalence for physical activity was significantly different: 22,3% for 300 minutes/week and 12,8% for 420 minutes/week (p<0,05), but the agreement was strong (k=0,82, p<0,001). The variables gender, father education, physical activity perception and sedentary behavior were associated to physical activity in both analyzed criteria. Participation in Physical Education class and facilities available to physical activity practice were associated to physical activity only with 300 minutes/week cutoff point.Conclusion:Caution is suggested regarding cutoffs use for physical activity in epidemiological studies, considering they can result in differences in prevalence of physical activity and its associated factors.