Enabling Population-Scale Physical Activity Measurement on Common Mobile Phones

U 01项目的主要目标是硬件的技术开发、部署和评估 和软件技术，这将使人口规模，纵向测量身体活动 使用普通的移动的电话。移动的手机在亚洲上市，很快将在美国上市， 加速度计和低功耗无线通信能力。本研究将探讨如何使用 这些计算设备用于精确测量身体活动类型、强度和回合持续时间。 利用消费者在手机上的支出，许多美国人将购买，维护和携带，它可能会 有可能进行大规模的研究，其中数十万参与者的身体活动是 以可承受的成本进行数月或数年的测量和远程监控。无线加速度计 在麻省理工学院设计的智能手机将被重新设计，以便它们可以将数据发送到2011年上市的普通移动的手机上。 使用当前版本传感器的实验室测试将用于比较相关信息 可以通过组合电话加速度计数据和通过佩戴一个或多个耳机获得的数据来获得的增益。 在不同的方便身体位置上的更多无线传感器（例如，在手表或包里，在鞋子上，在臀部， 等）。将确定加速度计的最佳但实用的配置， 移动的电话可以自动检测特定的身体活动，例如快走、跑步、骑自行车， 爬楼梯，扫地，做运动等。传感器将解决的技术挑战， 软件设计包括：（1）获取实际电池寿命;（2）获取高电量时身体活动数据 时间分辨率，（3）实现检测算法的个人特定定制，（4）寻址 实际终端用户对人体工程学、舒适度和社会可接受性的关注，（5）实时和 低成本的远程监控和维护研究与成千上万的电话用户，和（4） 使得能够使用其他现成的传感器设备，例如心率监视器，当它们变得可用时。一 将采用参与式设计过程来制定获得纵向符合性的策略 典型的手机用户。经过两轮迭代的技术开发，每次都有实验室验证 这项技术将在斯坦福大学进行为期10个月的50名典型电话用户中使用。有效性 相对于自我报告，将测量可接受性和纵向顺应性。

The primary aim of this U01 project is the technical development, deployment, and evaluation of hardware and software technology that will enable population-scale, longitudinal measurement of physical activity using common mobile phones. Mobile phones available in Asia and soon in the U.S. already include internal accelerometers and low-power wireless communication capabilities. This study will investigate how to use these computing devices for accurate measurement of physical activity type, intensity and bout duration .By exploiting consumer expenditures on phones that many Americans will purchase, maintain, and carry, it may be possible to run large-scale studies where the physical activity of hundreds of thousands of participants is measured and remotely monitored for months or years at an affordable cost. Wirelessaccelerometers designed at MIT will be redesigned so that they can send data to common mobile phones available in 2011. Laboratory testing using the current version of the sensors will be used to compare the relative information gain that can be obtained by combining the phone accelerometer data and data obtained by wearing one or more wireless sensors on different convenient body locations (e.g., in a watch or bag, on a shoe, at thehip, etc.). Optimal but practical configurations of accelerometerswill be determined so that software running on the mobile phone can automatically detect specific physical activities such as brisk walking, running, cycling, climbing stairs, sweeping, playing sports, etc. Technical challenges that will be addressed by the sensor and software design include, (1) obtaining practical battery life, (2) acquiring physical activity data at high temporal resolution, (3) enabling person-specific customization of the detection algorithms, (4) addressing practical end-user concerns about ergonomics, comfort, and social acceptability, (5) permiting real-time and low-cost remote monitoring and maintenance for studies with hundreds of thousands of phone users, and (4) enabling use of other off-the-shelf sensor devices, such as heart rate monitors, as they become available. A participatory design process will be employed to develop strategies for obtaining longitudinal compliance from typical phone users. After two rounds of iterative technical development, each with laboratory validation conducted at Stanford, the technology will be deployed with 50 typical phone users for 10 months. Validity relative to self report, acceptability, and longitudinal compliance will be measured.