Increasing physical activity in pre-school aged children: systematic review, individual participant meta-analysis and intervention pilot

该项目将采用流行病学、系统回顾和定性方法，探讨身体活动与学前环境之间的联系，以设计一种增加身体活动的干预措施。该项目将利用MRC流行病学单位的国际儿童加速度测量数据库（ICAD）的特殊资源来调查5个国家的学龄前儿童的身体活动。我将与拉夫堡大学、剑桥大学和提供ICAD数据的大学合作。此外，我将使用观察的环境和工作人员的做法，在12个托儿所和加速度计数据为116名2-4岁的儿童从NAP SACC英国RCT。本研究的问题和方法是：1。在学龄前儿童中，久坐、轻度和中度剧烈体力活动（MVPA）所花费的时间如何因国家、社会经济地位、性别、年龄、环境和一天中的时间而异？方法：对ICAD和NAP SACC UK试验中约900名2-4岁儿童的加速度计数据进行个人参与者荟萃分析。2.哪些因素与学龄前儿童在学龄前环境和家中久坐、光照和MVPA的时间相关？方法：对2-4岁儿童体力活动预测因素的观察性研究进行系统回顾和荟萃分析。3.与久坐时间和身体活动相关的变化因素的障碍和促进因素是什么？如何促进或克服这些障碍？方法：深入访谈工作人员在20个学前设置（家长，日间托儿所，学校托儿所，学前教育和儿童保姆）。与10个地方当局负责促进体育活动的工作人员进行了深入访谈。4.什么样的干预设计得到了学前专业人员和体育活动专业人员对学前环境中体育活动的支持？方法：采用德尔菲法开发干预设计。

The project will use epidemiology, systematic review and qualitative methods to explore the associations between physical activity and pre-school environments to design an intervention to increase physical activity. This project will be unique in using the special resource of the MRC Epidemiology Unit's International Children's Accelerometry Database (ICAD) to investigate physical activity of pre-school children in 5 countries. I will collaborate with the Universities of Loughborough, Cambridge and those providing ICAD data. Further, I will use observation of the environment and practices of staff in 12 nurseries and accelerometer data for 116 children aged 2-4 from the NAP SACC UK RCT. The research questions and methods will be: 1. How does the time spent in sedentary, light and moderate vigorous physical activity (MVPA) differ by country, SES, gender, age, setting and time of day in pre-school children? Method: individual- participant meta-analysis of accelerometer data of ~900 children aged 2-4-year-old children in ICAD and the NAP SACC UK trial. 2. What factors are associated with the time spent in sedentary, light and MVPA among pre-school children in pre-school settings and at home? Method: systematic review and meta-analysis of observational studies on the predictors of physical activity in 2-4-year-olds. 3. What are the barriers and facilitators of changing factors associated with sedentary time and physical activity? How can these be facilitated or overcome? Methods: In-depth interviews with staff in 20 pre-school settings (parents, day nurseries, school nurseries, pre-schools and child minders). In-depth interviews with staff in 10 Local Authorities responsible for promoting physical activity. 4. What intervention design has the support of pre-school professionals and physical activity professionals for physical activity in pre-school settings? Method: Delphi development of intervention design.