A Wireless, Multimode, Artificial Neural Network-Based Physical Activity Monitor

描述（由申请人提供）：准确测量儿童和成人的身体活动是一个具有挑战性的问题，对流行病学家、运动科学家、临床医生和行为研究人员都很重要。虽然有一些间接和直接的方法来评估身体活动和能量消耗，但所有现有的方法都有严重的、有据可查的缺点，相对于自由生活的个人而言。最近的研究表明，测量自由生活的个人身体活动的最实用，最客观的方法是使用基于心率和加速度联合监测的便携式活动监测器。在R21赠款资助下，提议团队开发并评估了一种新型的身体活动监测器（PAM-R21），用于估计能量消耗和在不同活动强度水平（例如，久坐/轻度、中度、剧烈）。使用心率和三轴加速度计，PAM-R21使用人工神经网络将心率和三轴加速度计数据转换为能量消耗的估计值，其表现优于唯一的商用集成心率/加速度活动监测器（即，Activheart）在估计的能量消耗、活动强度水平和心率方面。本文提出的研究将利用先前开发的PAM-R21来创建和验证低调的下一代PAM-R 01监测器;有效性和可靠性测试将在包括儿童、成人和老年人在内的不同人群中进行。PAM-R 01还将在广泛的身体活动强度范围内，包括活动之间的过渡期，在结构化和模拟自由生活活动中与现有的活动监测器进行比较。PAM-R 01体积小、重量轻、不显眼，并具有无线传输功能;它代表了有效、准确测量身体活动的重要一步。体育活动是一种重要的行为，与降低大量负面健康结果的风险有关。然而，缺乏身体活动的普遍性仍然高得令人无法接受;因此，减少缺乏身体活动的普遍性是公共卫生举措的一个主要重点。PAM-R 01活动监测仪的拟议开发有可能消除限制活动对健康影响研究的一个重大障碍：缺乏一种准确、不显眼和廉价的设备来测量自由生活个体的身体活动。它在其他领域也有很大的应用潜力，如步态研究，疼痛管理，老年稳定性评估和跌倒监测。

DESCRIPTION (provided by applicant): Accurate measurement of physical activity in children and adults is a challenging problem that is important to epidemiologists, exercise scientists, clinicians, and behavioral researchers. Although there are a number of indirect and direct methods to assess physical activity and energy expenditure, all current methods have serious, well-documented shortcomings vis-`a-vis application to free-living individuals. Recent research has shown that the most practical, objective method for measuring physical activity in free-living individuals is the use of portable activity monitors that are based on the joint monitoring of heart rate and accelerometry. Under R21 grant funding, the proposing team developed and evaluated a novel Physical Activity Monitor (the PAM-R21) for use in estimating both energy expenditure and the time spent at different activity intensity levels (e.g., sedentary/light, moderate, vigorous). Using heart rate and triaxial accelerometry, the PAM-R21, which uses artificial neural networks to convert heart rate and triaxial accelerometer data into estimates of energy expenditure, outperformed the only commercially-available integrated heart rate/acceleration activity monitor (viz., Actiheart) in terms of estimated energy expenditure, activity intensity level, and heart rate. The research proposed herein will leverage the previously-developed PAM-R21 to create and validate a low-profile, next-generation PAM-R01 monitor; validity and reliability testing will be performed in diverse populations that will include children, adults, and seniors. The PAM-R01 will also be compared with existing activity monitors in both structured and simulated free-living activities across a broad range of physical activity intensities, including the transitional periods between activities. The PAM-R01 will be small, lightweight, and unobtrusive, and will have wireless transmission capabilities; it represents an important step in the advancement of effective, accurate measurement of physical activity. PUBLIC HEALTH RELEVANCE: Physical activity is an important behavior that is related to reduce risk of a large number of negative health outcomes. However, the prevalence of physical inactivity remains unacceptably high; reducing the prevalence of inactivity is, therefore, a major focus of public health initiatives. The proposed development of the PAM- R01 activity monitor has the potential to remove one significant barrier that restricts research on the health effects of activity: the lack of an accurate, unobtrusive, and inexpensive device for measuring physical activity in free-living individuals. It also has strong potential for application in other areas, such as gait studies, pain management, and geriatric stability assessment and fall monitoring.