VALIDATION OF AN INTEGRATED HEART RATE/ACTIVITY MONITOR

这个子项目是许多研究子项目中利用 资源由NIH/NCRR资助的中心拨款提供。子项目和 调查员(PI)可能从NIH的另一个来源获得了主要资金， 并因此可以在其他清晰的条目中表示。列出的机构是 该中心不一定是调查人员的机构。 体力活动评估工具在研究中变得越来越重要。目前，评估体力活动的最常见方法是通过问卷调查，特别是在大量人口中。虽然这种方法得到了很好的验证，但它并不理想，因为它依赖于受试者的回忆，而且也不能提供关于体力活动强度的准确信息。通过问卷调查评估的体力活动召回的另一种选择是使用步长计数器和加速计(即运动传感器)，尽管目前可用的产品存在严重缺陷。例如，步数计数器对行走或跑步过程中的步数进行计数，但对于估计其他类型的活动、提供有关活动模式的时间信息或估计活动能量消耗没有用处。目前可用的大多数加速度计也有一个或多个限制。因此，需要进一步的研究和开发，以提供一种准确、不显眼和不显眼的活动监测器，可以用于量化儿童和成人的体力活动。弗吉尼亚州夏洛茨维尔的Barron Associates，Inc.已经开发出这样的体力活动监测器(PAM)。本研究的目的是将这项PAM的能量消耗估计与实际能量消耗和心率进行比较，这些能量消耗和心率是通过一个轻便的代谢测量系统通过氧气消耗测量出来的。这项研究工作是对NIH项目公告(PAR-03-009；改善饮食和体力活动评估)的回应，该项目旨在“支持研究，通过改进的仪器、技术或统计/分析技术来改善体力活动测量”，用于“普通和多样化的人群”。

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. Physical activity assessment tools have become increasingly more important in research. Currently, the most common method for assessing physical activity, especially in large populations, is via questionnaire. Although reasonably well validated, this method is less than ideal as it relies on subject recall and also cannot provide accurate information with regard to the intensity of physical activity. An alternative to physical activity recall as assessed via questionnaire is the use of step counters and accelerometers (i.e., motion sensors) although currently available products have serious shortcomings. For example, step counters count steps during walking or running, but they are not useful for estimating other kinds of activities, for providing temporal information about activity patterns, or for estimating activity energy expenditure. Most of the currently available accelerometers also have one or more limitations. Therefore further research and development is needed to make available an accurate, unobtrusive, and inconspicuous activity monitor that can be used for quantifying physical activity in children and adults. Barron Associates, Inc., in Charlottesville, VA, has developed such a physical activity monitor (PAM). The purpose of the present study is to compare energy expenditure estimates from this PAM with actual energy expenditure and heart rate measured via oxygen consumption with a lightweight, portable metabolic measurement system. This research effort is responsive to an NIH program announcement (PAR-03-009; Improving Diet and Physical Activity Assessment) designed to "support research to improve physical activity measurement through improved instruments, technologies, or statistical/analytic techniques," for use in "general and diverse populations."