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Development of extremely-small-sized portable recorder for heart rate, body temperature, step rate, and amount of physical activity

开发超小型便携式心率、体温、步数、体力活动量记录仪

基本信息

批准号：
06558007
负责人：
MATSUBARA Chikanobu
金额：
$ 2.11万
依托单位：
Kyoto Prefectural University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06558007/
关键词：
Heart rate Body temperature Step rate Amount of physical activity Recorder Acceleration

项目摘要

A small-sized (9.2cmx6.0cmx2.5cm) portable device was developed which was able to record heart rate, body temperature, step rate, and amount of physical activity, continuously every minute for 34 hours. Heart rate was derived from the electrocardiogram with affixed electrodes to the chest, body temperature was meastured with an external equipment which converted the resistance of thermistor into frequency signal, step rate was counted from detected vertical acceleration of the center of body gravity with an acceleration sensor, and amount of physical activity was obtained by rectifying the acceleration signal and integrating this wave shape. Electrocardiogram was amplified and filtered simultaneotusly with 3/4 of the quadruple operational amplifier (MC14573), and acceleration signal derived from the sensor IC (ADXL150) was also amplified and filtered with remainder 1/4 of the operational amplifier. Two kinds of analog signal, the potential of analog ground, and a frequency signal were inputted to single chip microcomputer with built-in A-D converter (PIC16C711). Then, the data of heart rate, body temperature, step rate, and amount of physical activity were obtained by the software. Successively, they were written in a cereal EEPROM (24LC65) at an interval of every minute. After recording period, the data stored in the recorder were transmitted to the readout interface as infrared rays, then changed to electrical signal, and transferred to the host computer through the serial port. Moreover the method was also developed to estimate daily energy expenditure accurately by using more than two variables among above mentioned 4 kinds of data.

开发了一种小型（9.2cmx6.0cmx2.5cm）便携式设备，该设备能够连续34小时每分钟记录心率、体温、步速和体力活动量。心率由心电图导出，电极贴在胸部，体温用外部设备测量，该设备将热敏电阻的电阻转换为频率信号，步频由加速度传感器检测的身体重心的垂直加速度计算，通过校正加速度信号并积分该波形来获得身体活动量。心电信号用3/4运放（MC 14573）进行放大和滤波，加速度信号用剩余1/4运放（ADXL 150）进行放大和滤波。该系统将模拟地电位和频率信号两种模拟信号输入到内置A/D转换器的单片机（PIC 16 C711）中。然后，通过该软件获得心率、体温、步频和身体活动量的数据。随后，它们以每分钟的间隔写入谷物EEPROM（24 LC 65）中。记录周期结束后，记录仪中存储的数据以红外线的形式传输到读出接口，再转换成电信号，通过串口传输到上位机。此外，还提出了利用上述4种数据中的两个以上变量来准确估计每日能量消耗的方法。