Self-Determination for Increasing Physical Activity

美国儿童和青少年肥胖症的日益普遍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低的人口中。在青春期， 活动（PA）减少，可能是儿童肥胖率上升趋势的重要因素。 很少有证据表明，校本课程干预导致整体PA的增加。因此， 该提案将评估一个创新的以学生为中心的课后计划的有效性， 增加服务不足的青少年的PA（例如，少数民族，社会经济地位低）。以学生为中心的干预是 与自我决定（动机）理论和社会认知理论一致，因为它强调 增加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 所有权在发展计划，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，使有效的PA的变化，在录像会议。我们的初步数据显示， 小组证明了以学生为中心的PA计划，以增加中度到剧烈PA的可行性 在南卡罗来纳州，建议的项目将采用以学校为基础的嵌套队列 设计以评估为期6个月的以学生为中心的计划与典型的课后计划的有效性， 在缺乏服务的青少年中增加PA。24所中学（每所学校70名六年级学生; N= 1 680）， 位于南卡罗来纳州的学生将被随机分配到两个课后项目中的一个。该研究采用了 嵌套队列设计，与学校，而不是个人分配到条件，并将分析使用 重复测量分析的协方差技术概述了默里。我们还将研究社会心理学 变量（PA自我效能，自我概念，动机，社会支持和享受）作为潜在的中介， 使用回归和结构方程建模技术对PA变化进行干预，如 男爵和肯尼这项研究将解决一个重要的公共卫生问题， 减少服务不足的青少年的肥胖。

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.