Physical activity monitoring system for elderly person living alone based on noncontact human body detection technique

本文提出了一种测量人体活动的方法，该方法基于检测非接触和非附着条件下步行运动产生的静电感应电流。提出了人体电势变化产生静电感应电流的理论模型。通过将得到的静电感应电流与理论模型进行比较，可以看出该模型有效地解释了静电感应电流波形的行为。使用位于普通房屋中的便携式传感器测量来记录日常生活中的正常行走动作。获得的结果表明，使用我们提出的技术可以估计关于步行周期等体力活动的详细信息。这表明所提出的技术可以成功地应用于人体体力活动的估计。

We here present a method for measuring human physical activity, which is based on detecting the electrostatic induction current generated by the walking motion under non-contact and non-attached conditions. A theoretical model for the electrostatic induction current generated because of a change in the electric potential of the human body is also proposed. By comparing the obtained electrostatic induction current with the theoretical model, it becomes obvious that this model effectively explains the behavior of the waveform of the electrostatic induction current. The normal walking motions of daily living are recorded using a portable sensor measurement located in an ordinary house. The obtained results show that detailed information regarding physical activity such as a walking cycle can be estimated using our proposed technique. This suggests that the proposed technique can be successfully applied to the estimation of human physical activity.