Barbosa Filho Valter Cordeiro, da Silva Kelly Samara, Mota Jorge, Vieira Neiva Francenely Cunha, Gubert Fabiane do Amaral, Lopes Adair da Silva
Research Centre in Physical Activity and Health, Department of Physical Education, Federal University of Santa Catarina, Florianópolis, Brazil; Research Centre in Physical Activity and Health in School, Institute of Physical Education and Sports, Federal University of Ceará, Fortaleza, Brazil; Research Centre in Physical Activity, Health and Leisure, Faculty of Sport, University of Porto, Porto, Portugal.
Research Centre in Physical Activity and Health, Department of Physical Education, Federal University of Santa Catarina, Florianópolis, Brazil.
Prev Med. 2017 Apr;97:80-85. doi: 10.1016/j.ypmed.2017.01.007. Epub 2017 Jan 19.
Knowledge about the effects of school-based interventions on modifiable physical activity (PA) determinants (e.g., social support), and whether the intervention effect differs according to students' characteristics (e.g., age and gender) are relevant PA promotion topics. This study aims to answer these topics among Brazilian students. This cluster-randomized controlled trial was conducted with 548 students in the intervention group and 537 in the control group (51.5% of boys; aged 11-18years). The four-month intervention included strategies focused on training teachers, opportunities for PA in the school environment, and health education. Potential PA determinants (attitude, self-efficacy, support of friends, parents, and teachers, perceived neighborhood environment and PA facilities in school) and moderators (gender, age, socioeconomic status (SES), and PA level at baseline) were assessed using self-reported instrument. Height and weight were measured to estimate the students' body mass index (BMI) status. Generalized linear models were used. In general, there was a significant and positive intervention effect for attitude, support of friends and teachers for PA, as well as PA facilities in school; effect size was 0.29, 0.24, 0.34, and 0.29, respectively (P<0.05). Age (support of friends, parents and teachers, and PA facilities in school), SES (support of friends and PA facilities in school), and BMI status (support of friends) were moderators of the intervention effect on some outcomes. In conclusion, the intervention improved potential PA determinants, but some changes occurred differently according to students' characteristics. These findings should be considered in PA policies in the school context.
This study is registered at Clinicaltrials.govNCT02439827.
了解基于学校的干预措施对可改变的身体活动（PA）决定因素（如社会支持）的影响，以及干预效果是否因学生特征（如年龄和性别）而异，是相关的PA促进主题。本研究旨在回答巴西学生中的这些主题。这项整群随机对照试验对干预组的548名学生和对照组的537名学生进行（男生占51.5%；年龄11 - 18岁）。为期四个月的干预措施包括侧重于培训教师、在学校环境中进行PA的机会以及健康教育的策略。使用自我报告工具评估潜在的PA决定因素（态度、自我效能、朋友、父母和教师的支持、感知的邻里环境和学校的PA设施）和调节因素（性别、年龄、社会经济地位（SES）以及基线时的PA水平）。测量身高和体重以估计学生的体重指数（BMI）状况。使用广义线性模型。总体而言，干预对态度、朋友和教师对PA的支持以及学校的PA设施有显著的积极影响；效应大小分别为0.29、0.24、0.34和0.29（P<0.05）。年龄（朋友、父母和教师的支持以及学校的PA设施）、SES（朋友的支持和学校的PA设施）和BMI状况（朋友的支持）是干预对某些结果影响的调节因素。总之，干预改善了潜在的PA决定因素，但根据学生特征，一些变化有所不同。在学校背景下的PA政策中应考虑这些发现。
本研究在Clinicaltrials.gov上注册，注册号为NCT02439827。
