Context-Sensitive Measurement of Physical Activity

描述(由申请者提供)：具体目标是开发和测试一种上下文敏感的生态瞬时评估(CSEMA)系统，用于测量自由生活人口的特定类型和总体力活动(PA)。CS-EMA由一台手持计算机(个人数字助理[PDA])组成，该计算机无线连接到心率(HR)监视器，并携带/佩戴在被监测者身上。它收集EMA PA日记信息(PA类型[例如，爬楼梯]、发生次数、持续时间、自我感觉强度)。心率监测器不断地将数据传输到PDA，在那里存储和分析数据以估计PA强度。中等强度或更高强度(MOD+)PA的时间段会触发CS-EMA提示(PDA哔声)，让受试者输入有关该时间段的PA日记数据。经过6个月的开发，CS-EMA将在两个职业组(管家和材料搬运工)中进行评估，他们执行的工作任务模仿PA在家中执行的工作，这是PA研究社区感兴趣的主题。在项目7-18个月，50名医院员工(25名管家和25名材料搬运工)将在工作时间内携带/佩戴CS-EMA PDA、HR监视器和5个两轴加速度计，为期一周(星期一至星期五)。在前4天，他们将使用CS-EMA提示系统连续2天记录PA日记信息，并在接下来的2天使用纸笔日记收集相同信息。使用顺序将是随机的。在所有四天的时间里，他们将由一名训练有素的观察员监督，并记录他们的PA。在一周的第五天(星期五)，受试者不会记录PA，也不会被观察到。他们将只由HR和加速计进行监测，以评估反应性。19-24个月的有效性分析将比较CS-EMA和纸质日记记录方法与观察者的黄金标准(PA类型、回合数和持续时间)和强度的HR。还将评估受试者对两种测量方法的满意度、对报告方案的遵守情况以及对观察者和测量方法的反应性。在19-24个月，我们将开发第二代CS-EMA，通过使用在12个月的研究期间收集的数据来创建算法，以改进MOD+PA识别和识别特定的PA(例如，爬楼梯)。这些算法将被合并到CS-EMA系统中，并将用于触发主题PA数据收集的提示。

DESCRIPTION (provided by applicant): The specific goal is to develop and test a Context-Sensitive Ecological Momentary Assessment (CSEMA) system for measuring specific types and total physical activity (PA) in free-living populations. CS-EMA consists of a hand-held computer (personal digital assistant [PDA]) connected wirelessly to a heart rate (HR) monitor and carried/worn on the person being monitored. It collects EMA PA diary information (PA types [e.g., stair climbing], occurrences, duration, self-perceived intensity). The HR monitor continuously transmits data to the PDA where it is stored and analyzed to estimate PA intensity. A time period of moderate or greater intensity (MOD+) PA triggers a CS-EMA prompt (PDA beep) for the subject to enter PA diary data about the period. Following 6-month development, CS-EMA will be evaluated in 2 occupational groups (housekeepers and materials handlers) who perform work tasks that mimic the PA performed by people in their homes, a subject of interest to the PA research community. During project months 7-18, 50 hospital employees (25 housekeepers and 25 materials handlers) will carry/wear the CS-EMA PDA, HR monitor and five 2-axis accelerometers for 1 week (Monday-Friday) during their working hours. During the first 4 days they will use the CS-EMA prompting system to record PA diary information on 2 consecutive days and a paper-and-pencil diary that collects the same information for another 2 consecutive days. The order of use will be random. During all four days they will be monitored by a trained observer who will record their PA. On the fifth day of the week (Friday), the subject will not record PA nor will they be observed. They will only be monitored by HR and accelerometers to evaluate reactivity. The validity analyses during Months 19-24 will compare CS-EMA and paper diary-recording methods against the gold standards of the observer (for PA types, number of bouts, and duration) and the HR for intensity. The subjects will also be assessed regarding their satisfaction with the two measurement methods, their adherence to the reporting protocol and their reactivity to both the observer and the measurement methods. In Months 19-24 we will develop a second generation CS-EMA, by using data gathered during the 12-month study to create algorithms for improving MOD+ PA recognition and for recognizing specific PAs (e.g., climbing stairs). These algorithms will be incorporated into the CS-EMA system and will be used to trigger prompts for subject PA data collection.