Development of an Innovative Physical Activity Self-report Instrument for Youth

描述（由申请人提供）：大多数美国青年不符合美国人的身体活动指南，一项重大的公共卫生工作正在进行中，以促进年轻人的身体活动。监测这一努力需要一个系统，提供有效的和详细的信息，身体活动的行为。虽然加速度测量法可以用于大规模的监测研究，但它昂贵，繁琐，并且不能提供有关身体活动的特定形式或背景的信息。自我报告的工具是实用的监测研究中使用，但目前没有自我报告的工具，为青年提供了良好的有效性与客观措施的身体活动和详细的信息，具体形式和活动的背景。本研究的目的是开发，试点测试，并验证一个身体活动自我报告工具，具有较强的结构效度，匹配以及与青少年的认知能力，强烈的关联与客观测量的身体活动，并包含项目，将提供信息的具体形式和身体/社会背景的身体活动在青年。本研究有两个目的：目的1是开发一个具有结构效度的青少年身体活动自我报告工具。我们将审查现有的PA工具和进行重点小组与96名中学男生和女生的文献，以确定共同的类型，频率和活动强度。从数据中，我们将确定一个池的候选人二分（是/否）的项目，并管理由此产生的工具，以500名中学生。项目反应理论将被用来选择最能代表11-15岁男孩和女孩的身体活动的项目。目的2是检验自我报告工具与青年身体活动客观测量的有效性。300名学生的独立样本将在佩戴加速度计7天后完成两份表格的最终自报仪器。一半的样本将通过仅提供是/否响应来完成仪器。另一半将提供“是/否”和参与频率的答复。分析将测试新仪器的有效性与每日分钟的中度到剧烈的身体活动测量通过加速度计。这项拟议的研究具有很高的公共卫生意义，因为它将开发一种测量青年体力活动的方法，该方法具有良好的有效性，可用于监测系统和大样本调查。这项研究是创新的，因为它将是第一次建立一个青少年身体活动自我报告工具，使用最先进的项目反应理论进行测试验证。该工具提供的信息将为旨在增加美国青年体育活动的公共卫生政策和计划的制定和评估做出重要贡献。 公共卫生相关性：拟议的研究将开发，使用最先进的测试验证方法，一个身体活动自我报告工具的青年，与客观测量的身体活动密切相关。该仪器将提供有关参与体力活动强度的信息（例如，中度到剧烈的身体活动）和特定形式的身体活动。新工具将在监测系统和大样本调查中实用，并将有助于制定和评估旨在增加青年体育活动的公共卫生政策和方案。

DESCRIPTION (provided by applicant): Most American youth do not meet the Physical Activity Guidelines for Americans, and a major public health effort is underway to promote physical activity in young people. Monitoring this effort requires a system that provides valid and detailed information on physical activity behavior. Although accelerometry can be used in large-scale surveillance studies, it is expensive, burdensome and provides no information about specific forms or contexts of physical activity. Self-report instruments are practical for use in surveillance studies, but no current self-report instrument for youth provides both excellent validity versus an objective measure of physical activity and detailed information on specific forms and contexts of activity. The purpose of this study is to develop, pilot test, and validate a physical activity self-report instrument that has strong construct validity, matches well with the cognitive abilities of youth, associates strongly with objectively-measured physical activity, and contains items that will provide information about specific forms and physical/social contexts of physical activity in youth. The proposed study has two Aims: Aim 1 is to develop a physical activity self- report instrument for youth that has robust construct validity. We will review the literature on existing PA instruments and conduct focus groups with 96 middle school boys and girls to identify common types, frequency, and intensity of activities. From the data, we will identify a pool of candidate dichotomous (Yes/No) items and administer the resulting instrument to 500 middle school students. Item Response Theory will be utilized to select the items that best represent the construct of physical activity in 11-15 year-old boys and girls. Aim 2 is to examine the validity of the self-report instrument versus an objective measure of physical activity in youth. An independent sample of 300 students will complete two forms of the final self-report instrument after wearing an accelerometer for 7 days. Half of the sample will complete the instrument by providing only Yes/No responses. The other half will provide both Yes/No and frequency of participation responses. Analyses will test the validity of the new instruments versus daily minutes of moderate-to-vigorous physical activity measured via accelerometry. The proposed study carries high public health significance because it will develop a measure of physical activity in youth that has excellent validity and is practical for use in surveillance systems and large sample investigations. The study is innovative because it will be the first time a physical activity self-report instrument for youth is built with a proven program of test validation using state-of-the-art Item Response Theory. The information provided by the instrument will contribute importantly to the development and evaluation of public health policies and programs aimed at increasing physical activity in U.S. youth. PUBLIC HEALTH RELEVANCE: The proposed study will develop, using a state-of-the-art method of test validation, a physical activity self-report instrument for youth that correlates strongly with objectively-measured physical activity. The instrument will provide information about participation in intensities of physical activity (e.g., moderate-to-vigorous physical activity) and specific forms of physical activity. The new instrument will be practical to use in surveillance systems and large-sample investigations and will contribute to the development and evaluation of public health policies and programs aimed at increasing physical activity in youth.