ENERGY BALANCE IN YOUNG BLACK AND WHITE NGHS WOMEN

描述：（改编自研究者摘要） 这项研究是为了检查黑人和白色女性在晚些时候的能量平衡， 青春期 本研究有两个主要目的：1）评估能源 能源消耗及其决定因素 活性（EEA）使用双标记水方法（DLW）和测量 静息代谢率（RMR）; 2）评估有效性， 自我报告的热量摄入和身体状况信息的可靠性 将自我报告与通过DLW获得的信息进行比较的活动 procedure. 这项研究将测试黑人妇女有一个 调整身体成分后的RMR低于白色女性， 较低的EEA与肥胖有关。 调查人员还将评估 通过比较确定身体成分的不同方法 使用全身水分（TBW）、双能X射线获得的信息 吸收测定法（DXA）、生物电阻抗分析（BIA）和 皮褶测量。 共有120名年龄在18至19岁的妇女，其中60名是黑人， 60例白色受试者，将从目前参与的受试者中随机选择 NHLBI生长与健康研究（NGHS） 的 研究者将从在辛辛那提登记的受试者中获得数据， 俄亥俄州研究中心。 这项研究的独特之处包括一个大的birtebrae 在过去10年中，参与者的样本在一个纵向 研究，并提供了一个广泛的数据库， 和行为数据。 研究人员描述了分析程序， 详细的假设检验。

DESCRIPTION: (Adapted from Investigator's Abstract) The purpose of this study is to examine energy balance in Black and White females in late adolescence. The study has two major objectives: 1) To assess energy expenditure and its determinants by estimating energy expenditure of activity (EEA) using the doubly labelled water method (DLW) and measuring resting metabolic rate (RMR); and 2) To asses the validity and reliability of self-reported information on caloric intake and physical activity comparing self reports with information obtained with the DLW procedure. The study will test the hypotheses that Black women have a lower RMR after adjusting for body composition than white women and that lower EEA is associated with obesity. The investigators will also assess different methods of determining body composition by comparing information obtained using total body water (TBW), dual energy x-ray absorptiometry (DXA), bioelectrical impedance analysis (BIA), and skinfold measures. A total of 120 women, aged 18-19 years, 60 Black and 60 White, will be randomly selected from subjects currently participating in the multi center NHLBI Growth and Health Study (NGHS). The investigators will obtain data from subjects enrolled at the Cincinnati, Ohio study site. Unique features of the study include a large biracial sample of participants enrolled for the past 10 years in a longitudinal study, and the availability of an extensive database containing lifestyle and behavioral data. The investigators describe analytic procedures for hypothesis testing in detail.