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

描述(申请人提供)：大多数美国年轻人不符合美国人的身体活动指南，一项重大的公共卫生努力正在进行中，以促进年轻人的身体活动。监控这一努力需要一个提供有关身体活动行为的有效和详细信息的系统。虽然加速度计可以用于大规模监测研究，但它昂贵、繁重，而且无法提供有关具体形式或体力活动背景的信息。自我报告工具在监督研究中是实用的，但目前没有一种针对青年的自我报告工具既能提供良好的有效性，又能提供关于具体活动形式和背景的详细信息，而不是客观的体力活动测量。本研究的目的是开发、试测和验证身体活动自我报告量表，该工具具有较强的结构效度，与青少年的认知能力匹配良好，与客观测量的身体活动有很强的关联性，包含的项目将提供关于青少年体育活动的具体形式和身体/社会背景的信息。本研究有两个目的：第一个目标是开发一个具有较强结构效度的青少年体育活动自我报告工具。我们将回顾有关现有PA工具的文献，并对96名中学男生和女生进行焦点小组研究，以确定常见的活动类型、频率和强度。从数据中，我们将确定一个候选二分(是/否)项目池，并对500名中学生进行管理。项目反应理论将被用来选择最能代表11-15岁男孩和女孩身体活动结构的项目。目的2是检查自我报告工具与客观测量青少年体力活动的有效性。一个由300名学生组成的独立样本将在佩戴加速度计7天后完成两份最终自我报告仪。一半的样本将通过只提供是/否的回答来完成仪器。另一半将提供是/否和参与答复的频率。分析将测试新仪器的有效性，以及通过加速计测量的中等到剧烈体力活动的每日分钟数。这项拟议的研究具有很高的公共卫生意义，因为它将制定一种衡量青年体力活动的方法，该方法具有极好的有效性，可用于监测系统和大样本调查。这项研究具有创新性，因为这将是第一次建立一个针对青少年的身体活动自我报告工具，该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对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：拟议的研究将利用最先进的测试验证方法，为青少年开发一种与客观测量的身体活动密切相关的身体活动自我报告工具。该工具将提供有关参加高强度体力活动(例如，中等至剧烈体力活动)和具体形式体力活动的信息。新工具将实际用于监测系统和大样本调查，并将有助于制定和评估旨在增加青少年体育活动的公共卫生政策和计划。

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.