DETERMINANTS OF BONE HEALTH IN YOUNG GYMNASTS

上一篇：关注儿童参与艺术 体操训练对生长发育有不良影响。 虽然有一个普遍的观念，体操参与是联系在一起的， 不良饮食，饮食失调，继发性闭经和骨质流失， 这一论点缺乏科学证据支持。 尽管低 钙，能量限制饮食和月经中断史， 大学体操运动员的骨密度（BMD）高于对照组。 经前体操运动员骨密度升高表明， 青春期开始之前的训练对于发育至关重要 峰值骨量 然而，有可能增强的BMD存在于 训练从未开始。 研究人员的主要假设是， 年轻时开始体操训练将提高BMD。 第二 假设艺术体操训练从小就开始 不会促进能量限制，低钙摄入或相关 饮食失调的心理症状。 还有人担心， 参加体操会导致身高降低。 减少 预测的身高和生长速度以及较低的胰岛素样生长因子 1（lGF-1）水平已发现在体操运动员。 然而，没有研究表明 随着时间的推移，在体操运动员中检查了lGF-1，也没有同时发生变化， 在体操运动员中检查身高和生长因子。 此外，没有 研究已经确定体操运动员的生长因子水平是否低于 比非体操运动员在训练开始前的表现要好。 第三个假设是 年轻时开始的艺术体操训练会阻碍生长， 并改变IGF-1和IGF-1结合蛋白-3（lGFBP-3）。 为了验证这些假设，女孩（五到八岁）将 在他们头两年的体操训练中进行了检查。 具体 该提案的目的是：1）确定是否存在BMD升高 在体操训练开始之前; 2）确定早期的影响， 体操训练对骨密度、膳食摄入及相关心理的影响 饮食行为障碍的症状; 3）确定饮食行为障碍的基础 通过评估生长因子和骨标记物提高体操运动员的骨密度 4）确定两年的体操训练是否会使 生长速度或改变生长因子。 这项研究将提供洞察力 早期开始的体操运动对骨骼的影响， 儿童的成长。

DESCRIPTION: There is concern that child participation in artistic gymnastics training has adverse consequences on growth and development. While there is a widespread notion that gymnastics participation is linked to poor diets, disordered eating, secondary amenorrhea, and bone loss, the scientific evidence supporting this contention is lacking. Despite low calcium, energy restricted diets and a history of menstrual disruptions, college gymnasts have higher bone mineral density (BMD) than controls. Elevated BMD in premenstrual gymnasts suggests that early gymnastics training, prior to the onset of puberty, is critical in the development of peak bone mass. However, it is possible the enhanced BMD exists before training ever begins. The investigators' main hypothesis is that artistic gymnastics training initiated at a young age will enhance BMD. A second hypothesis is that artistic gymnastics training initiated at a young age will not promote energy restriction, low calcium intakes or relevant psychological symptoms of disordered eating. There is also concern that gymnastics participation results in a reduced height. A reduction in predicted height and growth velocity and lower insulin-like growth factor 1(lGF-1) levels have been found in gymnasts. However, no studies have examined lGF-1 in gymnasts over time, nor have simultaneous changes in height and growth factors been examined in gymnasts. In addition, no studies have determined whether growth factor levels in gymnasts are lower than non-gymnasts priors to the onset of training. A third hypothesis is that artistic gymnastics training initiated at a young age will blunt growth velocity and alter lGF-1 and lGF-1 binding protein-3 (lGFBP-3). To test these hypotheses, girls (five to eight years of age) will be examined during their first two years of gymnastics training. The specific objectives of the proposal are: 1) to determine if elevated BMD is present before gymnastics training is initiated; 2) to determine the impact of early gymnastics training on BMD, dietary intakes and relevant psychological symptoms of disordered eating behavior; 3) to determine the basis for elevated BMD in gymnasts by assessing growth factors and markers of bone turnover; and 4) to determine if two years of gymnastics training will blunt growth velocity or alter growth factors. This study will provide insight into the impact of gymnastics activity initiated at an early age on bone and growth in children.