A SCHOOL PROGRAM TO ENHANCE BONE HEALTH IN GIRLS

描述（改编自申请人的描述）：骨质疏松症是一种 起源于儿科的老年病。峰值骨量的发展， 这是在生命的第三个十年实现的，受到行为的影响， 在儿童和青少年时期，最明显的是钙的消耗， 体力活动。在青春期，45%的成年骨骼质量 身高增加15%。国家和地方调查表明， 青春期女孩钙摄入量不足， 体力活动水平。虽然学校为基础的项目已经显示出希望， 在影响心血管健康的危险因素方面， 以骨健康为目标的基于行为的程序受到限制。的 该提案的主要目标是开发和评估一个基于学校的 营养和身体活动计划，称为骨（现在击败骨质疏松症 通过锻炼和明智饮食），以提高女孩未来的骨骼健康。 BONES计划的要素将基于社会认知理论（SCT） 并将包括行为（以学生为导向的课堂课程）和 环境（学校食品服务、体育）部分。的 该计划将包括两个阶段：一个可行性试验，其中干预 材料和措施将预先测试和验证，主要 干预试验。18所不同种族的中学， 德克萨斯州将被随机分为对照组或干预组， 作为随机化和分析的单位。九所学校将 接受为期2年的干预（BONES），而对照学校将 继续他们的日常健康计划。据推测，学生在 干预学校将，平均而言，（1）有3%的跟骨 超声硬度指数，（2）每天多摄入2份钙- 含食物，（3）每天进行17分钟以上的剧烈运动， 与对照学校的学生相比。次要假设. 学生水平是：干预学生将（1）表现出更高 自我效能、骨骼健康知识、含钙食物得分 和运动;和（2）有较高的平均摄入量的钙和平均更大 每天进行负重锻炼的频率与 控制学校。学校一级的次要假设是： 干预学校将提供（1）更多的含钙食物;（2） 比对照学校有更多的机会进行负重活动。

DESCRIPTION (Adapted from Applicant's Description): Osteoporosis is a geriatric disease that has pediatric origins. Development of peak bone mass, which is achieved by the third decade of life, is influenced by behaviors during childhood and adolescence, most notably calcium consumption and physical activity. During the pubertal years, 45% of the adult skeletal mass and 15% of adult height are gained. National and local surveys indicate that adolescent girls have inadequate calcium intakes and lower than recommended levels of physical activity. Although school-based programs have shown promise in affecting risk factors for cardiovascular health, application of behaviorally-based programs to target bone health have been limited. The primary goal of this proposal is to develop and evaluate a school-based nutrition and physical activity program, called BONES (Beat Osteoporosis Now by Exercising and Eating Smart), to enhance future bone health in girls. Elements of the BONES program will be based on Social Cognitive Theory (SCT) and will include both behavioral (student-oriented classroom lessons) and environmental (school food service, physical education) components. The program will consist of two phases: a feasibility trial in which intervention materials and measures will be pre-tested and validated, and the main intervention trial. Eighteen ethnically diverse middle schools from central Texas will be randomized into control or intervention conditions, with schools serving as the unit of randomization and analysis. Nine of the schools will receive the 2-year intervention (BONES), while the control schools will continue their usual health programs. It is hypothesized that students in intervention schools will, on average, (1) have a 3% greater calcaneus ultrasound Stiffness Index, (2) consume 2 more servings/day of calcium- containing foods, and (3) engage in 17 more minutes/day of vigorous physical activity compared to students in the control schools. Secondary hypotheses at the student level are: intervention students will (1) demonstrate higher scores in self-efficacy, knowledge of bone health, calcium-containing foods and exercise; and (2) have higher mean intakes of calcium and average greater frequencies of weight bearing type exercises per day compared to students in the control schools. Secondary hypotheses at the school level are: intervention schools will offer (1) more calcium-containing foods; and (2) more opportunities for weight-bearing activities than control schools.