OSTEOPOROSIS PREVENTION IN PREADOLESCENT GIRLS (BE A STAR! BANK ON YOUR BONES!)

我们开发了一种创新的行为/教育干预措施， 减少青春期前骨质疏松症的可改变的危险因素 姑娘们拟议研究的目的是证明 增加膳食钙摄入量的干预措施， 在危险人群中进行负重锻炼， 骨量的增加--特别是， 10岁和12岁。将采用整群随机化对女孩进行随机化 侦察部队要么干预或教育计划只。 18名女童子军（144名女孩）将被随机分配到每组 (i.e.,估计每队有8名女孩参加）。干预 包括利用各种媒体的3个交互式会话（即，开销 幻灯片、图形和三维演示）来演示 教学材料。主题包括骨质疏松症的解释， 其可改变和不可改变的危险因素，预防骨质疏松症 通过健康的食物选择（即，高钙、低脂肪食物），以及 通过负重运动预防骨质疏松症（具体地说， 跳绳。）每个女孩都有一个“3天星星图”， 图形，便于自我监测她朝着1350目标的进展 100毫克的钙。星星贴纸代表的服务大小 含钙150毫克（1颗星星）或300毫克（2颗星星）的食物。 “星星锻炼金字塔”同样允许简单的自我监测， 用代表5-、10-或 15-每周进行10分钟的负重锻炼。激励是 来强化干预课程的内容 也就是说，一个食物金字塔磁铁，一个有1杯和2杯服务标记的杯子 尺寸，跳绳，一本跳绳游戏的小册子。干预计划 通过每月自我监测18个月来加强。教育 唯一的节目包括三个关于健康饮食的一般会议， 身体健康和健康的生活方式选择。的主要结局 感兴趣的是更高的钙摄入量和更高的负重水平 锻炼的第二个令人感兴趣的结果是增加了宽带 超声衰减的跟骨评估使用定量 超声.总之，目标女孩群体是理想的， 因为他们正处于骨量快速增加的阶段。我们 假设干预将最大限度地提高他们的机会， 达到潜在的峰值骨量，从而进一步促进最终的 预防骨质疏松症的目标。

We have developed an innovate behavioral/education intervention designed to decrease modifiable risk factors for osteoporosis in preadolescent girls. The objective of the proposed study is to demonstrate the efficacy of this intervention in increasing levels of dietary calcium intake and weight-bearing exercise within an at-risk population in a stage of rapid accrual of bone mass--specifically, premenarchal Girl Scouts between the ages of 10 and 12. Cluster randomization will be used to randomize Girl Scout troops to either the intervention or a program of education only. Eighteen Girl Scout troops (144 girls) will be randomized into each arm (i.e., an estimated 8 girls participating per troop). The intervention consists of 3 interactive sessions utilizing various media (i.e., overhead transparencies, graphics, and three-dimensional demonstrations) to present instructional material. Topics include an explanation of osteoporosis and its modifiable and non-modifiable risk factors, prevention of osteoporosis via healthy food choice (i.e., high calcium, low fat foods), and prevention of osteoporosis via weight-bearing exercise (specifically, jumping rope.) Each girl is given a "3-day Star Chart" with colorful graphics for easy self-monitoring of her progress toward the goal of 1350 to 100 mg of calcium per day. Star stickers represent serving sizes of foods that contain either 150 mg (1 star) or 300 mg (2 stars) of calcium. The "Star Exercise Pyramid" similarly allows simple self monitoring of weight-bearing activity to be recorded with stars representing 5-, 10- or 15-minutes blocks of weight bearing exercise per week. Incentives are given to the girls to reinforce the content of the intervention sessions-- i.e., a food pyramid magnet, a mug with markings for 1 and 2 cup serving sizes, jump ropes, a booklet of jump rope games. The intervention program is reinforced via monthly self monitoring for 18 months. The education only program consists of three generic sessions on healthy eating, physical fitness, and healthy lifestyle choices. The primary outcomes of interest are higher calcium intake and higher levels of weight bearing exercise. A secondary outcome of interest is increased broadband ultrasound attenuation of the os calcis assessed using quantitative ultrasound. In summary, the group of girls targeted is ideal for this intervention since they are at a stage of rapid accrual of bone mass. We postulate that the intervention will maximize their opportunity for attaining potential peak bone mass, thus serving to further the ultimate goal of osteoporosis prevention.