Priscila Iumi Watanabe

Fidedignidade de um questionário de comportamento sedentário em escolares

Objective: To evaluate the reliability of a sedentary behavior questionnaire. Methods: Cross-sectional study with 1,119 students from 9 to 15 years old from seven public schools in Curitiba, Parana, Brazil, between March and December 2015. The questionnaire consists of 13 items divided into five aspects (screen time, educational, cultural, social and transportation) in which the participants reported time spent in sedentary activities (hours and/or minutes) in a typical week. For the reliability analysis, two applications of the questionnaire were performed and the intraclass correlation coefficient evaluated the reproducibility, Bland–Altman scatter plot assessed the concordance between the two test-retest measurements, and Cronbachs alpha, the internal consistency of the questionnaire, adopting 5% as significance level. Results: The intraclass correlation coefficient and Cronbachs alpha presented values greater than 0.70, being higher on weekdays than on weekends. The two applications of the questionnaire presented a mean difference of 228.27 minutes/week, with 95% confidence interval of 175.86 to 280.68. The limits of agreement ranged from 2,015.33 to -1,558.79 minutes/week. Conclusion: The questionnaire presented satisfactory reliability and can be used to measure sedentary behavior in students from 9 to 15 years old of public schools.

ASSOCIAÇÃO ENTRE A PROVOCAÇÃO REFERENTE AO PESO CORPORAL E A ATIVIDADE FÍSICA EM ADOLESCENTES

ABSTRACT Objective: The aim of the study was to determine the association between weight-teasing and physical activity in students from public schools of Curitiba, Paraná (Southern Brazil). Methods: The sample consisted of 95 students (48 boys and 47 girls) aged 12 to 14 years old. The Perception of Weight Teasing (POTS) and The Perception of Weight Teasing during Physical Activity Scale assessed the frequency of weight-teasing experienced by the participants. Accelerometers measured physical activity. BMI assessed the weight status of the participants. Pearson correlations analyzed the association between the teasing and physical activity variables at a significance level of 0.05. Results: The relationship between teasing variables and physical activity was not significant. A large proportion of participants failed to meet the recommended levels of physical activity regardless of sex (72%), and girls were significantly less physically active than boys (56.3% of boys and 89.4% of girls; p<0.01). Conclusions: Some participants were targets of weight-teasing, but teasing was not related to physical activity. Interventions are necessary to educate middle school students about the harmful consequences of weight teasing.