Efetividade de uma intervenção de base escolar sobre o tempo de tela em estudantes do ensino médio

Abstract

-Few interventions to reduce sedentary behavior in youth have been successful and have had only subtle effects. The aim of the study was to assess the effectiveness of a school-based intervention to promote physical activity and healthy eating habits on screen time indicators in students. This was a randomized controlled intervention study of high school students (15-24 years of age) who attended evening classes in the public schools of 2 Brazilian capital cities, Florianópolis and Recife. Data collection was performed via a questionnaire at the beginning (March) and end (December) of the 2006 school year. Students who reported spending 2 or more hours per day watching television or playing videogames/using the computer on weekdays or weekend days were considered exposed to screen time. Logistic regression analyses were performed. Among the 2,155 students included in the baseline sample, 989 were evaluated during the post-intervention period. The intervention group showed significantly reduced exposure to videogame/computer time on weekend days compared with the control group (29.8% vs. 35.6%; p=0.004). After adjusting for potential confounding factors, the results showed that the intervention had no significant effect on reducing the exposure to screen time in the surveyed students. The intervention model adopted in the Saúde na Boa project was not effective in reducing the screen time exposure of high school students. (29,8% vs 35,6%, respectivamente; p=0,004

Prevalence of excessive screen time and associated factors in adolescents

“…7,28 Physical activity and sedentary behaviors are distinct constructs with ''determinants'', associated factors and specific health implications. 32,33 Martins et al 28 found that correlated adverse factors for physical activity practice were not associated with sedentary behavior in adolescents. 1 Systematic reviews have demonstrated that the association between sedentary behaviors and physical activity, when significant, showed very low magnitude, 14,31 and that interventions to increase physical activity practice levels had no significant effects and, when they did, they showed low magnitude to reduce the time observed in sedentary behaviors.…”

Programas de intervenção para atividade física nas escolas brasileiras: revisão com base no modelo RE-AIM

“…Os objetivos das intervenções foram, além do aumento da prática de AF, a promoção da saúde, 5,26,28 hábitos alimentares, 4,[19][20][21][22][23][24][25]27,29,31 comportamento sedentário 5,26,29 e prevenção da obesidade e excesso de peso 24,25,27,30 (Quadro 1).…”

“…De maneira geral, os programas utilizaram estratégias com diversos componentes. As ações educativas foram citadas por todos os estudos e a realização de formação/ treinamento de professores foi uma ação utilizada pela maioria 4,5,[19][20][21][22][23]26,28,29,31 (Quadro 1).…”

Effect of a multicomponent intervention on variables related to screen time in adolescents: a cluster-randomized controlled trial

“…In the Brazilian scenario, in an intervention developed with the purpose of preventing obesity in girls, there was a significant reduction of 38 minutes/day in computer use at the weekend 7 . On the other hand, an intervention aimed at the promotion of physical activity was not able to significantly reduce the screen time of schoolchildren 8 . In addition to the reduction of screen time, researches have been developed with the purpose of advancing the discussion about the psychosocial aspects that are related to this behavior 9 .…”