RESUMO
Physical inactivity is considered a major cause of morbidity and mortality worldwide. The aim of this study was to analyze the association of socio demographic factors, weight status, body adiposity and sedentary behavior with the practice of walking and moderate and vigorous physical activity in adolescents. This cross-sectional study included 631 adolescents (413 girls) aged 14-17 years. A self-administered questionnaire was used to collect data. Boys showed longer time of practice of walking and vigorous activity than girls. Adolescents of high economic level were more involved in vigorous activities. Overweight girls and adolescents showed, respectively, 98 and 138 minutes/week less of practice of walking when compared to boys and normal-weight adolescents. Adolescents with high body adiposity had 100 minutes/week more of practice of walking in relation to adolescents with normal adiposity. In relation to vigorous activity, girls showed 198 minutes/week less when compared to boys. The association of factors investigated in this study with the practice of physical activity in adolescents varies according to the type and intensity of the activity performed.
A inatividade física é considerada uma das principais causas de morbimortalidade no mundo. O objetivo do presente estudo foi analisar a associação de fatores sociodemográficos, status do peso, adiposidade corporal e comportamento sedentário com a prática de caminhada, atividade física moderada e vigorosa em adolescentes. Estudo transversal conduzido em 631 adolescentes (413 moças) de 14 a 17 anos de idade. Um questionário auto administrado foi utilizado para coletar as informações. Os rapazes apresentaram maior tempo de prática de caminhada e atividade vigorosa em comparação às moças. Os adolescentes de nível econômico médio tiveram maior participação em atividades vigorosas. As moças e os adolescentes com sobrepeso apresentaram, respectivamente, 98 e 138 minutos/semana a menos de prática de caminhada quando comparados aos rapazes e aos adolescentes de peso normal. Adolescentes com adiposidade elevada apresentaram 100 minutos/semana a mais de prática de caminhada em relação aos seus pares com adiposidade normal. Quanto às atividades vigorosas, as moças apresentaram menos 198 minutos/semana quando comparadas aos rapazes. A associação dos fatores investigados neste estudo com a prática de atividades físicas varia de acordo com o tipo e intensidade de atividade física realizada.
RESUMO
The objective of this study was to investigate the effects of socioeconomic, demographic and lifestyle factors on abdominal obesity in adolescents from a Brazilian state capital. In this cross-sectional study, 656 high school students (423 girls and 233 boys) from public schools, ranging in age from 14 to 19 yr, were evaluated. Abdominal obesity was identified based on waist circumference. Socioeconomic data (socioeconomic status, household head's education, and school grade), demographic data (gender and age), and information regarding lifestyle (physical activity, eating habits, aerobic fitness, and nutritional status) were collected. Logistic regression was used for multivariate analysis. The prevalence of abdominal obesity was 6.6% (95% confidence interval [CI]: 4.6-8.4). Being in the second (odds ratio [OR] = 0.41; 95% CI: 0.19-0.88) or third year (OR = 0.18; 95% CI: 0.06-0.59) of high school was a protective factor against abdominal obesity. In addition, students presenting low aerobic fitness (OR = 4.10; 95% CI: 1.62-10.4) and those with excess weight (OR = 208.6; 95% CI: 47.7-911.7) had a higher probability of abdominal obesity. In conclusion, demographic factors such as school grade, lifestyle habits, low aerobic fitness and excess weight are associated with central obesity.