Calibrating and validating accelerometry for use across early childhood (6-24 months)

项目摘要 加速度计是客观测量体力活动的标准，但令人惊讶的是，数据有限 在2岁之前的幼儿时期使用加速度计的最佳实践。基于HIP的 加速度计可能会让婴幼儿感到不舒服，特别是在睡眠期间，因此会减少 合规性和限制24小时综合测量。在脚踝佩戴该装置可能会克服 这些限制，但关于基于脚踝的加速度计对体力活动进行分类的性能数据 幼儿时期的紧张程度很低。一项研究支持基于踝关节的加速度测量在 刚学会走路的孩子只有14个月大，但这种方法还没有被一个独立的研究小组复制。 此外，在移动但非卧床前通过加速测量来校准体力活动强度的数据 婴儿缺乏症。我们的长期目标是开发针对体力活动的肥胖预防干预措施 在我们农村社区的家庭中，在童年早期睡觉。该项目的目标是评估 踝关节加速度计在测量6-24个月婴儿体力活动中的有效性，这是 支持养成体育锻炼行为。我们的基本原理是提供一种有效的方法来测量儿童的 在一项为期数天的评估中，24小时与一台设备一起活动和睡觉，父母的负担最小 还有孩子。我们的具体目标是1)校准和验证分类体力活动强度的算法 适用于使用脚踝和髋关节的活动前和活动婴儿和幼儿(6-24个月大) 加速度计并比较两个磨损部位的性能，以及2)评估 踝关节与髋关节加速度计的佩戴方案和体力活动强度分类 6-24个月大的婴儿在自然环境中进行为期多天的评估。这两个目标都将使用活动记录仪 GT3X+加速度计。在第一个目标中，将鼓励儿童参与一系列半结构化的 在佩戴两个加速计的同时进行不同强度的活动，一个在脚踝，一个在臀部。我们会 根据直接观察来校准这两个设备，并评估每个设备的相对性能。在目标2中， 另一组6-24个月大的婴儿将被要求在脚踝和臀部连续佩戴加速度计。 在他们的自然环境中超过四天，我们将比较父母的满意度，对穿着的遵从性 协议，以及对两个穿戴地点的每日体力活动强度的估计。这项拟议的研究是 在我们看来，这是创新的，因为它专注于基于脚踝的加速度计测量的可能性 儿童早期阶段的体力活动强度，目的是使用 非卧床前婴儿的加速测量数据。这项拟议的研究具有重要意义，因为它将提供 为该年龄段的加速度测量最佳实践提供信息所需的关键数据，并可能促进 通过基于脚踝的加速度计测量超过24小时的身体活动和睡眠。

Project Summary Accelerometry is standard for objectively measuring physical activity, yet there is surprisingly limited data for best practices when using accelerometry during early childhood, before the age of 2 years. Hip-based accelerometry may be uncomfortable for infants and toddlers particularly during periods of sleep, thus reducing compliance and limiting integrated 24-hour measurements. Wearing the device at the ankle may overcome such limitations, yet data on the performance of ankle-based accelerometry to classify physical activity intensity during early childhood is sparse. One study supports the validity of ankle-based accelerometry among toddlers as young as 14 months, yet the approach has yet to be replicated by an independent research group. Furthermore, data to calibrate physical activity intensity via accelerometry among mobile yet pre-ambulatory infants are lacking. Our long-term goal is to develop obesity-prevention interventions targeting physical activity and sleep during early childhood for families in our rural communities. The goal of this project is to assess the validity of ankle-based accelerometry in measuring physical activity among 6-24-month-olds, a critical stage to support developing physical activity behaviors. Our rationale is to provide a valid method to measure children’s 24-hour movement and sleep with one device over a multiple-day assessment with minimal burden on parents and children. Our specific aims are to 1) Calibrate and validate algorithms to classify physical activity intensity for pre-ambulatory and ambulatory infants and toddlers (6-24 months old) using ankle- and hip-based accelerometry and compare the performance between the two wear sites, and 2) Assess the feasibility of the wear protocol and classification of physical activity intensity for ankle- versus hip-based accelerometry among 6-24-month-olds during a multiple-day assessment in their natural settings. Both aims will use the ActiGraph GT3X+ accelerometer. In the first aim, children will be encouraged to engage in a series of semi-structured activities of varying intensities while wearing two accelerometers, one at the ankle and one at the hip. We will calibrate both devices against direct observation and assess the relative performance of each. In aim 2, another sample of 6-24-month-olds will be asked to wear an accelerometer at the ankle and hip continuously over four days in their natural settings, and we will compare parent satisfaction, compliance with the wear protocol, and estimates of daily physical activity intensity across the two wear sites. This proposed research is innovative, in our opinion, because it focuses on the possibility of ankle-based accelerometry to measure physical activity intensity during the early childhood stage and aims to classify physical activity intensity using accelerometry data for pre-ambulatory infants. This proposed research is significant because it will provide critical data needed to inform best practices for accelerometry for this age group and may facilitate integrated measurements of physical activity and sleep over 24-hours via ankle-based accelerometry.