Effectiveness Trial of a Dissonance-Based Obesity Prevention Program
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 364
- 试验地点
- 4
- 主要终点
- Body Fat Percentage
研究概览
简要总结
Obesity is a major US public health problem. Few obesity prevention programs have reduced risk for weight gain over follow-up and those that have are very intensive, making dissemination difficult and costly. A brief 3-hr selective prevention program (Healthy Weight) targeting young adults with body dissatisfaction involving participant-driven healthy dietary and physical activity lifestyle changes significantly reduced increases in body mass index (BMI) and obesity onset relative to alternative interventions and assessment-only controls through 3-yr follow-up, though effects were small in magnitude. To enhance efficacy, the investigators added dissonance-inducing activities regarding unhealthy dietary and activity practices, drawing from a highly efficacious dissonance-based eating disorder prevention program. A pilot trial found that this new Project Health intervention significantly reduced increases in BMI relative to both the Healthy Weight intervention and an educational brochure condition from pre to post. The investigators propose to conduct a rigorous multisite effectiveness trial that will test whether adding the dissonance-induction elements to the originally Healthy Weight intervention improves weight gain prevention effects. 360 college students at risk for future weight by virtue of their age and weight concerns will be randomized one of three conditions: (1) a refined 6-hr group-based dissonance-based Project Health, (2) a 6-hr group-based Healthy Weight intervention, or (3) a psychoeducational video ("Weight of the World") condition. Participants will complete assessments of % body fat, mediators (including objectively measured physical activity), moderators, and other outcomes at pre, post, and 6, 12, and 24 month follow-ups.
详细描述
Aim 1 will test the hypothesis that Project Health significantly reduces increases in % body fat relative to the Healthy Weight intervention and video control condition during a 2-yr follow-up; secondary outcomes are BMI, depressive symptoms and eating disorder symptoms. The investigators will also compare Healthy Weight to video controls.
Aim 2 will test the hypothesis that Project Health participants will experience increased cognitive dissonance (an uncomfortable psychological state) regarding eating unhealthy foods and engaging in sedentary behaviors, and that changes in dissonance mediate the program's weight gain prevention effects. The investigators will also test whether reduced calorie intake and increased physical activity mediate the effects of Project Health on change in % body fat.
Aim 3 will test the hypothesis that intervention effects are amplified for participants with elevated body dissatisfaction (which should increase motivation change) and preference for consistency (which should maximize dissonance induction) and mitigated for participants who report emotional eating and substance use (because these factors increase risk for overeating).
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Prevention
- 盲法
- None
入排标准
- 年龄范围
- 17 Years 至 23 Years（Child, Adult）
- 性别
- All
- 接受健康志愿者
- 是
入选标准
- •University student
- •Presents with self-reported "weight concerns"
排除标准
- •Diagnosis of Eating Disorder
- •Underweight
- •Non-english speaking
研究组 & 干预措施
Healthy Weight
The main goal of the Healthy Weight intervention is to make small, sustainable changes to input and output on a weekly basis to achieve a balance between caloric intake and output. All sessions begin with a brief review of what was covered in the previous session, presentation of educational handouts, careful review of previous behavior change goals, and the development of healthy behavior change plans for the next session. Home exercises for all sessions consist of following individualized diet and exercise goals, and keeping a food and exercise log to determine areas for future healthy changes.
干预措施: Healthy Weight (Behavioral)
Project Health
Project Health adds dissonance-inducing activities, discussions, and homework activities to the Healthy Weight basic intervention. Each session begins with a verbal commitment to participate (to underscore the voluntary nature of participation), includes discussions of completed home practice assignments and in-session writing/sharing exercises (to create accountability), and concludes with home exercises (to increase level of effort). Completed home assignments are videotaped in subsequent sessions to increase accountability.
干预措施: Project Health (Behavioral)
Control
Some participants will be randomized to control condition whereby they will be given an psychoeducational video ("Weight of the World")to view.
干预措施: Placebo Control (Behavioral)
结局指标
主要结局
Body Fat Percentage
时间窗: Changes in body fat from baseline to 2-year follow up
We will use air displacement plethysmography (ADP) via the Bod Pod S/T to assess % body fat. Two measures will be averaged. Body density, calculated as body mass divided by estimated body volume, is used to calculate age- and gender-adjusted body fat percentile scores, based on normative reference data (McCarthy et al., 2006). A pilot validity study (N = 30) revealed that direct DEXA measures of % body fat correlates much more strongly with ADP estimates of body fat (r = .88) than with BMI (r = .23). Change in age- and gender-adjusted body fat percentile over the 2-year follow-up will be the primary outcome. This assessment takes 3-5 minutes to complete.
次要结局
- Food Craving/Liking(Baseline, 6 weeks (post intervention), 6/12/24 month follow ups)
- Eating Pathology(Baseline and post intervention (6 weeks); 6/12/24 month follow-up)
- Negative Affect(Baseline and post intervention (6 weeks); 6/12/24 month follow-ups)