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

描述（由申请人提供）：大多数美国年轻人不符合美国人的身体活动指南，一项主要的公共卫生努力正在进行中，以促进年轻人的身体活动。监测这种努力需要一个系统，提供有效和详细的信息，身体活动的行为。虽然加速度计可用于大规模监测研究，但它昂贵，负担沉重，并且不能提供有关身体活动的具体形式或背景的信息。自我报告工具在监测研究中是实用的，但目前没有一种青少年自我报告工具既能有效地测量身体活动，又能提供关于特定形式和活动背景的详细信息。本研究旨在开发一套建构效度强、与青少年认知能力匹配、与客观测量的体育活动有较强关联性的体育活动自我报告工具，并对其进行初步测试和验证。该工具所包含的项目将提供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：目的一是开发一套建构效度较强的青少年体育活动自我报告工具。我们将回顾现有PA工具的文献，并对96名中学男生和女生进行焦点小组讨论，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类（是/否）项目池，并将结果工具管理给500名中学生。项目反应理论将被用来选择最能代表11-15岁男孩和女孩的体育活动结构的项目。目的2是检验自我报告工具与客观测量青少年身体活动的有效性。300名独立的学生将在佩戴加速度计7天后完成两种形式的最终自我报告仪器。一半的样本将通过只提供“是”或“否”的回答来完成测试。另一半将提供是/否和参与频率的回答。分析将测试新仪器与通过加速度计测量的每日中等到剧烈体育活动分钟数的有效性。这项拟议的研究具有很高的公共卫生意义，因为它将开发一种青少年身体活动的测量方法，这种方法具有极高的有效性，并且可用于监测系统和大样本调查。这项研究具有创新性，因为它将是第一次使用最先进的项目反应理论建立一个经过验证的测试验证程序的青少年体育活动自我报告工具。该工具提供的信息将对旨在增加美国青少年体育活动的公共卫生政策和方案的制定和评估作出重要贡献。

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.