Pilot Study on Bicycle Trains to Improve Children's Physical Activity

描述（由申请人提供）：体力活动可降低心血管疾病、2型糖尿病和多种癌症的风险，对预防肥胖很重要。美国儿童的积极通勤上学（ACS;步行或骑自行车上学），以前很常见（1969-1970年为42%），现在不常见（2009年为13%）。这一下降与肥胖症流行相吻合，肥胖症对低收入和少数民族儿童的影响不成比例。增加儿童中度至剧烈体力活动（MVPA）和降低肥胖风险的计划是必要的。自行车列车是一个创新的计划，其中儿童骑自行车上学和放学的成年人领导。自行车列车为ACS提供了另一种选择，特别是对于那些住得太远而不能步行上学的孩子。没有随机对照试验（RCT）评估自行车列车和儿童ACS或MVPA。增加骑车上学的儿童比例是美国健康人2020的子目标PA-14。 主要目标是：（a）在低收入、少数民族的四年级和五年级儿童中开展自行车列车项目的试点集群RCT;（B）收集同步加速计和GPS数据，并验证算法，以识别和测量儿童骑自行车时的身体活动强度和持续时间，并与心率监测仪进行比较。这项试点研究将提供可行性数据，并扩展量化骑自行车相关的MVPA的有效性，为未来的全动力R 01资助的自行车列车集群RCT。 我们的具体目标将是：SA 1）在80名四年级和五年级的少数民族儿童中评估自行车列车项目的试点集群RCT的可行性，以（a）为计划的全面集群RCT招募参与者（B）促进他们的参与，以及（c）确定他们参与的障碍/促进因素;和SA 2）与心率监测和直接观察的标准相比，验证检查并发加速度测量和GPS数据的算法，以识别和测量儿童在骑自行车时的身体活动强度和持续时间。作为试点研究的建议，其主要目标是测试研究方案的可行性，如果：FC 1）我们成功招募了80名低收入的4年级和5年级儿童参加试点自行车列车RCT FC 2）干预儿童参加了R 01资助的集群RCT，则确定该研究方案是可行的。 平均每周两次的自行车训练计划FC 3）分析并发GPS和加速度计数据的算法在区分儿童与骑自行车相关的身体活动持续时间和强度与其他身体活动方面与心率数据至少具有中等一致性 这一R21应用程序将提供针对少数民族儿童的重要规划和方法验证，少数民族儿童是儿童期风险最高的人群 肥胖在美国

DESCRIPTION (provided by applicant): Physical activity decreases the risk of cardiovascular disease, Type 2 Diabetes, and multiple cancers, and is important for obesity prevention. US children's active commuting to school (ACS; walking or cycling to school), previously common (42% in 1969-1970) is now uncommon (13% in 2009). This decline coincided with the obesity epidemic, which disproportionately affects low-income and ethnic minority children. Programs to increase children's moderate-to-vigorous physical activity (MVPA) and lower obesity risk are necessary. The Bicycle Train is an innovative program in which children cycle to and from school led by adults. The Bicycle Trains provide another option for ACS, especially for children who live too far to walk to school. No randomized controlled trials (RCT) have evaluated Bicycle Trains and children's ACS or MVPA. Increasing the percent of children who cycle to school is sub-objective PA-14 of US Healthy People 2020. The Primary Goals are to (a) conduct a pilot cluster RCT of a Bicycle Train program among low- income, ethnic minority 4th and 5th grade children and (b) collect concurrent accelerometer and GPS data and validate algorithms to identify and measure physical activity intensity and duration for children's cycling compared to heart rate monitors. This pilot study will provide feasibility data and extend the validity of quantifying cycling-related MVPA for a future fully-powered R01-funded Bicycle Train cluster RCT. Our Specific Aims will be to: SA1) evaluate among 80 4th and 5th grade ethnic minority children the feasibility of a pilot cluster RCT of a Bicycle Train program for (a) recruiting participants for a planned full-scale cluster RCT (b) promoting their participation, and (c) identifying barriers/facilitators to their participation; and SA2) validate algorithms examining concurrent accelerometry and GPS data to identify and measure children's physical activity intensity and duration while cycling compared to the criterion standards of heart rate monitoring and direct observation Feasibility Criteria: As recommended for pilot studies, in which the main goal is to test feasibility of a research protocol, a fully powered R01-funded cluster RCT will be determined to be feasible if: FC 1) We successfully recruit 80 low-income 4th and 5th grade children for the pilot Bicycle Train cluster RCT FC 2) The intervention children participate in the Bicycle Train program on average twice/week FC 3) Algorithms analyzing concurrent GPS and accelerometer data have at least moderate agreement with heart rate data in distinguishing children's cycling-related physical activity duration and intensity from other physical activities and riding in a motor vehicle This R21 application will provide important planning and methods validation targeted towards ethnic- minority children, the population at highest risk for childhood obesity in the US.