Family Fit: Promoting Family-Based Physical Activity and Weight Gain Prevention Through Mobile Technology

项目总结/摘要 美国儿童超重和肥胖的流行率使数百万人面临慢性疾病的风险（例如，2型 糖尿病，某些癌症）。鉴于儿童期体重过度增加往往是渐进的， 也应该包括正常体重的儿童。定期的身体活动（PA）有助于健康的体重 尽管PA的体重调节益处仅在活动达到中度至中度时才能得到， 强强度PA（MVPA）（非光强度PA）。然而，只有达到推荐的MVPA水平， 不到5%的成年人和42%的儿童（根据客观措施），MVPA倾向于进一步下降 在青春期。在此之前需要采取干预措施（即，年龄9-12岁），以防止下降， 利用这一理想时期进行以家庭为基础的干预，因为父母仍然具有榜样的影响力。 影响家庭的干预措施可以防止PA下降，同时帮助儿童和成人 更加积极，但缺乏有可能广泛传播的有效干预措施。因此我们 建议完善和测试一个移动的应用程序提供的基于家庭的PA干预，以解决目前的差距， 以家庭为基础的干预措施和技术工具，直接针对MVPA与新的PA目标，整合 通过可穿戴PA设备（Fitbit），提供积极的家庭沟通技能培训， 社会网络，并提供机会，家庭支持的进展显示和理论为基础的消息。 我们将进行应用程序的可用性测试和一个试点随机试验， 亲子配对（9-12岁的儿童），以比较Family Fit干预与仅Fitbit条件。的 拟议研究的目的是完善我们基于应用程序的干预措施，并收集有关 该方法的可行性和可接受性，以最终确定后续更大疗效试验的设计。 目标1：完善家庭健身应用程序。我们将把我们的干预转化为应用程序。利用以用户为中心的 在这种方法中，我们将根据n=12个亲子配对的咨询委员会的反馈，迭代地完善应用程序 （9-12岁儿童）。 目标2：试点可行性试验。我们将随机抽取60对父母-子女配对，进行家庭匹配条件（干预） 或者说，“唯”是“唯”，“唯”是“唯”的意思。主要结果将是 12周后家庭健康干预的可行性和6周后的可持续性。可行性 结果是招聘、应用程序使用率、可接受性和保留率。我们还将探讨二分体的变化 MVPA，家庭系统理论过程（例如，家庭凝聚力，沟通，支持）和BMI（BMI为 成人，儿童BMI百分位数）。

PROJECT SUMMARY/ABSTRACT Epidemic rates of overweight and obesity in US children put millions at risk for chronic disease (e.g., Type 2 diabetes, some cancers). Given that excessive childhood weight gain is often gradual, obesity prevention efforts should also include normal weight children. Regular physical activity (PA) contributes to healthy weight maintenance though the weight regulation benefits of PA are only derived when activity reaches moderate- to vigorous-intensity PA (MVPA) (not light-intensity PA). However, recommended levels of MVPA are only reached by less than 5% of adults and only 42% of children (per objective measures), and MVPA tends to further decline during adolescence. Interventions are needed before this period (i.e., ages 9-12 years), to prevent declines and capitalize on this ideal period for family-based interventions, given the influence parents still hold as role models. Interventions that reach families could prevent declines in PA and simultaneously help children and adults be more active, but effective interventions with potential for widespread dissemination are lacking. Thus, we propose to refine and test a mobile app-delivered family-based PA intervention that addresses current gaps in family-based interventions and technology tools, by directly targeting MVPA with a novel PA target, integrating with a wearable PA device (Fitbit), offering skills training in positive family communication, linking to a parent social network, and providing opportunities for family support progress displays and theory-based messaging. We will conduct app usability testing and a pilot randomized trial with insufficiently physically active parent-child dyads (child 9-12 years old) to compare the Family Fit intervention to a Fitbit Only condition. The objective of the proposed study is to refine our app-based intervention and gather preliminary data on the feasibility and acceptability of the approach to finalize the design of the subsequent larger efficacy trial. Aim 1: Refine the Family Fit App. We will translate our intervention into an app. Leveraging a user-centered approach, we will iteratively refine the app with the feedback of an advisory board of n=12 parent-child dyads (child 9-12 years old). Aim 2: Pilot Feasibility Trial. We will randomize 60 parent-child dyads to the Family Fit Condition (intervention) or the Fitbit Only Condition (comparison) where dyads will receive only Fitbits. The primary outcome will be the feasibility of the Family Fit intervention after 12 weeks and sustainability after an additional 6 weeks. Feasibility outcomes are recruitment, app use rates, acceptability, and retention. We will also explore changes in dyad MVPA, Family Systems Theory processes (e.g., family cohesion, communication, support), and BMI (BMI for adults, BMI percentile for children) at 12 and 18 weeks.