Body mass index and sum of skinfolds: Which is the best predictor of body image dissatisfaction in adolescents? / Índice de masa corporal y suma de pliegues de la piel: ¿cuál es el mejor predictor de insatisfacción con la imagen corporal en los adolescentes? / Índice de massa corporal e somatório de dobras cutâneas: qual é o melhor preditor da insatisfação com a imagem corporal em adolescentes?

Objective: To assess the association of body image dissatisfaction with two anthropometric indicators (body mass index and sum of skinfolds) in female adolescents and to identify the best predictor of body image dissatisfaction in this population. Method: The study included 329 female students aged 11-14 years from Santa Maria/RS. Body image was evaluated by the scale of body silhouettes of Stunkard et al. Body weight, height and skinfold thickness were measured to calculate body mass index and sum of skinfolds. The chi-square test and logistic regression analyses were used in the SPSS(R) 15.0 software, adopting a significance level of 5.0%. Results: Body image dissatisfaction was associated with both anthropometric indicators; however, body mass index showed greater predictive power of this phenomenon, and overweight and obese students were three times more likely to be dissatisfied. Conclusion: This study suggests the use of body mass index as an anthropometric indicator in studies on body image in this population due to its strong relationship with body image dissatisfaction

Objetivo: Evaluar la asociación de la insatisfacción con la imagen corporal con dos indicadores antropométricos (índice de masa corporal y la suma de pliegues cutáneos) en adolescentes de sexo femenino e identificar el mejor predictor de la insatisfacción con la imagen corporal en esta población. Método: El estudio incluyó 329 mujeres estudiantes de edades entre 11-14 años de Santa Maria/RS. La imagen corporal fue evaluada por la escala de siluetas de Stunkard et al. Se midieron el peso corporal, la estatura y el espesor del pliegue cutáneo para calcular el índice de masa corporal y la suma de los pliegues cutáneos. El test chi-cuadrado y análisis de regresión logística se realizaron en el programa SPSS 15.0, adoptando un nivel de significación del 5.0%. Resultados: La insatisfacción con la imagen corporal se asoció con ambos indicadores antropométricos. Sin embargo, el índice de masa corporal mostró una mayor capacidad de predicción de este fenómeno, y estudiantes con sobrepeso y obesidad presentaron tres veces más probabilidades de estar insatisfechos. Conclusión: Este estudio sugiere el uso del índice de masa corporal como indicador antropométrico en los estudios de imagen corporal en esta población debido a su estrecha relación con la insatisfacción con la imagen corporal

Objetivo: avaliar a associação da insatisfação com a imagem corporal com dois indicadores antropométricos (índice de massa corporal e soma de dobras cutâneas) em adolescentes do sexo feminino e identificar o melhor preditor da insatisfação com a imagem corporal nesta população. Método: O estudo incluiu 329 estudantes do sexo feminino com idades entre 11-14 anos de Santa Maria/RS. A imagem corporal foi avaliada por meio da escala de silhuetas de Stunkard et al. Peso corporal, estatura e dobras cutâneas foram mensuradas para calcular o índice de massa corporal e o somatório de dobras cutâneas. O teste Qui-quadrado e análise de regressão logística foram utilizadas no software SPSS(R) 15.0, adotando um nível de significância de 5.0%. Resultados: A insatisfação com a imagem corporal esteve associada com ambos os indicadores antropométricos. No entanto, o índice de massa corporal mostrou maior poder de preditivo deste fenômeno e os estudantes com sobrepeso e obesidade apresentaram três vezes mais chance de estarem insatisfeitos. Conclusão: Este estudo sugere o uso do índice de massa corporal como um indicador antropométrico em estudos sobre a imagem corporal nesta população devido a sua forte relação com a insatisfação com a imagem corporal

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)

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.

Morphological and physical fitness characteristics of under-16 Portuguese male handball players with different levels of practice.

AIM: The aim of this study was to compare the morphology and physical fitness of 104 under-16 male handball athletes with different competitive levels in function of their bone maturation. METHODS: Athletes were divided into two groups, 59 competed in the NL-national league, with higher competitive level (14.06±0.66 years) and 45 competed in the RL-regional league (14.24±0.60 years). The morphology was evaluated by measuring body mass, height, sitting height, arm span, four lengths, four breadths, five girths and eleven skinfolds. The physical fitness assessment used eight tests (20-m shuttle run; 30-m sprint; sit-and-reach; horizontal and vertical jump with counter movement; overhead medicine ball throw-3 kg; handgrip; handball specific agility test). Bone age was determined using the TW3 method. RESULTS: In morphological terms, NL athletes showed greater dimensions for all anthropometric variables except for hand length (transversal and longitudinal), biepicondylar femur breadth, mid-thigh girth and skinfolds. In physical fitness terms, these athletes have better results for VO2max, velocity, agility, arm strength and handgrip than athletes competing in the RL. Maturational differences explain the morphological profile superiority of NL athletes in terms of arm span, lower limb length, biacromial breadth and physical fitness profile for VO2max and arm strength. CONCLUSION: Maturation should be considered as a covariate when one intends to distinguish the morphological characteristics and physical fitness of under-16 athletes with different levels of practice.