ENERGY BALANCE IN YOUNG BLACK AND WHITE NGHS WOMEN

描述：(改编自《调查者摘要》) 研究旨在检测黑人和白人女性晚年的能量平衡 青春期。这项研究有两个主要目标：1)评估能源 支出及其决定因素通过估计能源支出 用双标记水法测定活度(EEA) 静息代谢率(RMR)；2)评估有效性和 自我报告的卡路里摄入量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 程序。这项研究将检验黑人女性有 经身体成分调整后的RMR低于白人女性 较低的EEA与肥胖有关。调查人员还将评估 比较法测定人体成分的不同方法 使用全身水(TBW)、双能x射线获得的信息 吸光度(DXA)、生物电阻抗分析(BIA)和 紧身衣的尺寸。共有120名年龄在18-19岁之间的女性，60名黑人和 60名怀特，将从目前参与的受试者中随机选择 在多中心NHLBI生长与健康研究(NGHS)中。这个 调查人员将从辛辛那提注册的受试者那里获得数据， 俄亥俄州的研究地点。这项研究的独特之处包括一个大的双胞胎 过去10年纵向登记的参与者样本 研究，以及包含生活方式的广泛数据库的可用性 和行为数据。调查人员描述了分析程序，以 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.