Self-Determination for Increasing Physical Activity

美国儿童和青少年中肥胖率的上升是对我们社会的主要健康威胁， 特别是在少数民族和社会经济地位较低的人群中。青春期的身体状况 活动量(PA)减少，可能是儿童肥胖率上升趋势的重要因素。 几乎没有证据表明，以学校为基础的课程干预会导致总体PA的增加。因此，这一点 提案将评估以学生为中心的创新课后计划的效果，以促进 增加未得到充分服务的青少年(例如，少数族裔、社会保障程度低的青少年)的保护范围。以学生为中心的干预措施是 与自主(动机)理论和社会认知理论的一致性在于它强调 提高PA的内在动机和行为技能。以学生为中心的项目中的青少年 在开发计划中的所有权，选择产生乐趣和兴趣的体育活动，并产生他们的 自己的应对策略，在录像会议期间做出有效的PA改变。来自我们的初步数据 小组论证了以学生为中心的PA计划的可行性，以增加中等到剧烈的PA 在南卡罗来纳州服务不足的青少年中。拟议的项目将使用以学校为基础的嵌套队列 旨在评估为期6个月的以学生为中心的计划与典型的课后计划的效果 在服务不足的青少年中增加PA。24所中学(每所学校70名6年级学生；N=1,680人)， 位于南卡罗来纳州，将被随机分配到两个课外项目中的一个。这项研究采用了一种 嵌套队列设计，与学校，而不是个人分配条件，将分析使用 穆雷概述的协方差技术的重复测量分析。我们还将检查心理社会 变量(PA自我效能感、自我概念、动机、社会支持和快乐)作为潜在的中介变量 使用回归和结构方程建模技术对PA变化的干预，概述如下 巴伦和肯尼。这项研究将解决一个重要的公共卫生问题，这将对 减少服务不足的青少年的肥胖症。

The increasing prevalence of obesity in U.S. children and adolescents is a major health threat to our society, especially among minority and low social economic status (SES) populations. During adolescence physical activity (PA) decreases and is likely an important contributor to the increasing trend in childhood obesity rates. Little evidence suggests that school-based curriculum interventions lead to increases in overall PA. Thus, this proposal will evaluate the efficacy of an innovative student-centered after-school program for promoting increases PA among underserved adolescents (e.g., minorities, low SES). The student-centered intervention is consistent with Self-Determination (Motivation) Theory and Social Cognitive Theory in that it emphasizes increasing intrinsic motivation and behavioral skills for PA. Adolescents in the student-centered program take ownership in developing the program, select physical activities that generate fun and interest, and generate their own coping strategies for making effective PA changes during a videotaped session. Preliminary data from our group demonstrates the feasibility of the student-centered PA program for increasing moderate-to-vigorous PA in underserved adolescents in South Carolina. The proposed project will use a school-based nested cohort design to evaluate efficacy of a 6-month student-centered program versus typical after-school program on ncreasing PA in underserved adolescents. Twenty-four middle schools (70 6th graders per school; N=1,680), located in South Carolina will be randomly assigned to one of two after-school programs. The study employs a nested cohort design, with schools, rather than individuals assigned to condition and will be analyzed using repeated measures analysis of covariance techniques as outlined by Murray. We will also examine psychosocial variables (PA self-efficacy, self-concept, motivation, social support, and enjoyment) as potential mediators of the intervention on changes in PA using regression and structural equation modeling techniques as outlined by Baron and Kenny. This study will address an important public health problem that will have implications for decreasing obesity in underserved adolescents.