Predictors of dropout in the school-based multi-component intervention, 'Mexa-se'.

To identify the predictors of dropout in the 'Mexa-se' intervention according to the body mass index (BMI) category. This was a controlled, non-randomized study. The intervention included: (i) increase in the intensity of physical activities (PA) in physical education (PE) classes; (ii) active recess; (iii) educational sessions on PA, nutrition and body image; and (iv) educational materials. Dropout was considered when students dropped out of intervention, or did not reach 75% attendance in PE classes. The independent variables were gender, age, study period, socioeconomic status, BMI, PA, screen time, food consumption, health perception, attitudes toward PA, self-efficacy for PA, perception of the school environment, body image and self-esteem. Binary logistic regression analysis was used. The dropout rate was 26.8%. In the total sample and among students with an adequate BMI, there was a greater probability of dropout with an increase in age. For overweight students, increased age and socioeconomic status, and studying in the afternoon period were predictors of dropout from the intervention. Socio-demographic factors were predictors of dropout from the 'Mexa-se' intervention; the associated factors differed based on the BMI category.

Aptidão cardiorrespiratória em adolescentes / Aptitud cardiorrespiratoria en adolescentes / Cardiorespiratory fitness in adolescents

Objetivo. O presente estudo tem como objetivo verificar as prevalências de aptidão cardiorrespiratória e a sua associação com aspectos sociodemográficos e composição corporal em adolescentes. Método. Estudo transversal realizado com 601 escolares (14‐17 anos de idade) da rede de ensino pública do Meio‐Oeste catarinense. A aptidão cardiorrespiratória foi mensurada pelo teste de vai‐e‐vem de 20 metros. Foram coletadas informações referentes ao sexo, idade e nível econômico, massa corporal, estatura, perímetro da cintura e dobras cutâneas. As análises estatísticas (U de Mann‐Whitney, qui‐quadrado e regressão logística) foram realizadas, com nível de significância de 5%. Resultados. A prevalência de aptidão cardiorrespiratória inadequada foi de 61.1%, sendo maior nos rapazes e naqueles com composição corporal inadequada. A composição corporal inadequada esteve associada à aptidão cardiorrespiratória inadequada, mesmo após ajustada pelo sexo, idade e nível econômico. Conclusão. Conclui‐se que a maioria dos adolescentes apresentam níveis inadequados de aptidão cardiorrespiratória, e a associação entre composição corporal e aptidão cardiorrespiratória inadequadas independe dos aspectos sociodemográficos dos adolescentes (AU)

Objetivo. El presente estudio tuvo como objetivo verificar las prevalencias de aptitud cardiorrespiratoria y su asociación con aspectos sociodemográficos y composición corporal en adolescentes. Método. Estudio transversal realizado con 601 escolares (14‐17 años) de la red de educación pública del Medio‐Oeste catarinense. La aptitud cardiorrespiratoria fue medida por el test de carrera de ida y vuelta de 20 metros. Fueron recogidas informaciones referentes al sexo, edad y nivel económico, masa corporal, estatura, perímetro de la cintura y pliegues cutáneos. Los análisis estadísticos (U de Mann‐Whitney, Chi cuadrado y regresión logística) fueron realizados, con nivel de significación del 5%. Resultados. La prevalencia de aptitud cardiorrespiratoria inadecuada fue de 61.1%, siendo mayor en los muchachos y en aquellos con composición corporal inadecuada. La composición corporal inadecuada estuvo asociada a la aptitud cardiorrespiratoria inadecuada, incluso después de ajustarla por el sexo, edad y nivel económico. Conclusión. Se concluye que la mayoría de los adolescentes presentan niveles inadecuados de aptitud cardiorrespiratoria y la asociación entre composición corporal y aptitud cardiorrespiratoria inadecuadas no depende de los aspectos sociodemográficos de los adolescentes (AU)

Objective. The aim of this study was to determine the prevalence of cardiorespiratory fitness and its association with sociodemographic characteristics and body composition in adolescents. Method. This is a cross‐sectional study with 601 students (14‐17 years) of the public school system in the Mid‐western state of Santa Catarina. Cardiorespiratory fitness was measured by the 20‐meter back‐and‐forth test. Information on gender, age and economic status, body weight, height, waist circumference and skinfold thickness were collected. Statistical analysis (Mann‐Whitney U, chi‐square and logistic regression tests) was performed, with 5% significance level. Results. The prevalence of inadequate cardiorespiratory fitness was 61.1%, being higher in boys and in those with inadequate body composition. Inadequate body composition was associated with poor cardiorespiratory fitness even after adjusted by sex, age and economic status. Conclusion. It was concluded that most adolescents showed inadequate levels of cardiorespiratory fitness and the association between body composition and inadequate cardiorespiratory fitness is independent of sociodemographic characteristics of adolescents (AU)

Health-related physical fitness in Brazilian adolescents from a small town of German colonization / Aptidão física relacionada à saúde de adolescentes Brasileiros de uma cidade de pequeno porte e colonização germânica / Aptitud física relacionada con la salud en adolescentes brasileños de una pequeña ciudad de colonización germánica

Objective. To identify the health-related physical fitness profile of Brazilian adolescents (10-17 years) living in a small town of German colonization and to describe the prevalence of those with low levels of physical fitness according to sex and age. Method. This is a school-based cross-sectional epidemiological study conducted with all adolescents (10-17 years) enrolled in five public schools of São Bonifácio, Brazil. The study included 277 adolescents (145 boys and 132 girls). The FITNESSGRAM® test battery was applied for the assessment of percent body fat, flexibility, muscle strength/endurance and cardiorespiratory fitness. Results. Higher mean values of percent body fat and flexibility (p < 0.01) were found in girls; boys showed higher means (p < 0.01) for pull-up and cardiorespiratory fitness tests. The prevalence of adolescents with low levels of physical fitness was high for percent body fat (boys: 29.3%, girls: 31.8%, p = 0.75), flexibility (boys: 26.9%, girls: 54.5%, p < 0.01), muscle strength/endurance (curl-up: 37.9% of boys and 45.5% of girls, p = 0.25; modified pull-up: 47.6% of boys and 54.5% of girls, p = 0.30) and cardiorespiratory fitness (boys: 28.0%, girls: 36.9%, p = 0.15). As for the overall physical fitness, 75.7% of boys and 88.9% of girls did not meet the minimum recommended values (p = 0.01). Conclusion. Effective intervention programs are necessary to promote changes in the health-related physical fitness profile of adolescents from São Bonifácio, Brazil (AU)

Objetivo. Identificar o perfil da aptidão física relacionada à saúde de adolescentes brasileiros (10-17 anos), de origem étnica germânica e descrever a prevalência daqueles com baixa aptidão física, de acordo com o sexo e idade. Método. Estudo epidemiológico transversal de base escolar realizado com todos os adolescentes (10-17 anos) de 5 escolas públicas de São Bonifácio (Brasil). O estudo incluiu 277 adolescentes (145 rapazes e 132 moças). Aplicou-se a bateria de testes FITNESSGRAM® para avaliar o percentual de gordura corporal, flexibilidade, força/resistência muscular e aptidão cardiorrespiratória. Resultados. As moças apresentaram maiores valores médios de percentual de gordura e de flexibilidade (p < 0.01). Os rapazes apresentaram melhor desempenho nos testes de flexão de braços e aptidão cardiorrespiratória (p < 0.01). A prevalência dos adolescentes que não atingiram a zona saudável de aptidão física foi elevada para a gordura corporal (rapazes: 29.3%; moças: 31.8%; p = 0.75) flexibilidade (rapazes: 26.9%; moças: 54.5%; p < 0.01), força/resistência muscular (teste abdominais: 37.9% dos rapazes e 45.5% das moças, p = 0.25; teste de flexão de braços: 47.6% dos rapazes e 54.5% das moças; p = 0.30) e aptidão cardiorrespiratória (rapazes: 28.0%; moças: 36.9%; p = 0.15). Na aptidão física geral, 75.7% dos rapazes e 88.5% das moças não atingiram o mínimo proposto para a saúde (p = 0.01). Conclusão. Programas efetivos de intervenção são necessários para a promoção de mudanças no perfil da aptidão física relacionada à saúde dos adolescentes de São Bonifácio (Brasil) (AU)

Objetivo. Identificar el perfil de aptitud física y salud de adolescentes brasileños (10 a 17 años) de una pequeña ciudad de colonización germánica, así como describir la prevalencia de aquellos con baja aptitud física de acuerdo al sexo y la edad. Método. Estudio epidemiológico transversal de base escolar realizado con todos los adolescentes (10 a 17 años) de cinco escuelas públicas de San Bonifacio, SC (n = 277; 145 niños), en 2010. Se utilizó la batería de tests FITNESSGRAM® para evaluar la porcentaje de grasa corporal, la flexibilidad, la fuerza/resistencia muscular y la aptitud cardiorrespiratoria. Resultados. Se encontró un mayor porcentaje medio de grasa corporal y de flexibilidad (p < 0.01) en las niñas; en los niños se obtuvieron mayores porcentajes medios en dominadas y en los test de aptitud cardiorrespiratoria (p < 0.01). La prevalencia de adolescentes con baja aptitud física fue elevada para la grasa corporal (niños: 29.3%; niñas: 31.8%; p = 0.75), para la flexibilidad (niños: 26.9%; niñas: 54.5%; p < 0.01), para la fuerza/resistencia muscular (test de abdominales: 37.9% de los niños y 45.5% de las niñas, p = 0.30) y para la aptitud física cardiorrespiratoria (niños: 28.0%; niñas: 36.9%; p = 0.15). En cuanto a la aptitud física general, 75.7% de los niños y 88.9% de las niñas no alcanzaron los valores mínimos recomendados (p = 0.01). Conclusión. Son necesarios programas efectivos de intervención para la promoción de cambios en el perfil de aptitud física relacionada con la salud de adolescentes de San Bonifacio, SC (AU)

Body image dissatisfaction and anthropometric indicators in male children and adolescents.

BACKGROUND/OBJECTIVES: The aim of this study was to investigate the association between body image dissatisfaction and body mass index (BMI) and body fat percentage (BF%) and to identify which of these anthropometric indicators are more strongly associated, and finally to estimate the prevalence of overweight and high body adiposity in male children and adolescents, according to maturational stages. SUBJECTS/METHODS: Overall, 1499 students aged from 7 to 17 years from Cascavel, PR, Brazil, were evaluated. Body image was self-rated through the body silhouette scale. Body weight, height and triceps and subscapular skinfolds were measured and BMI and BF% were calculated. Sexual maturity was self-assessed by the development of pubic hair. Data analysis used the Fisher exact test, the χ(2)-test and multinomial logistic regression. RESULTS: Body image dissatisfaction because of excess weight was associated with BMI and BF%, whereas in prepubertal students, this association did not remain in the adjusted analysis. In pubescent students, both BMI (odds ratio (OR)=5.25, confidence interval (CI) 95%=3.06-9.01) and BF% (OR=2.42, CI 95%=1.60-3.66), and in post-pubescent students for BMI (OR=3.77, CI 95%=1.33-10.70), the association remained. Body image dissatisfaction because of thinness was associated only with BF% in pubescent (OR=0.50, CI 95%= 0.33-0.75) and post-pubescent students (OR=0.38, CI 95%= 0.16-0.94). CONCLUSIONS: Body image dissatisfaction was associated with BMI and BF%, especially in pubescent and post-pubescent students.