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Development of Ambulatory Oxygen Uptake Measurement System

动态摄氧量测量系统的开发

基本信息

批准号：
63870009
负责人：
TOGAWA Tatsuo
金额：
$ 4.03万
依托单位：
Institute for Medical and Dental Engineering, Tokyo Medical and Dental 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：
1988
资助国家：
日本
起止时间：
1988 至 1990
项目状态：
已结题

项目摘要

An apparatus for monitoring prolonged measurement of oxygen uptake without discomfort has been developed. The principle on which the system is based is the open flow-through system. The subject wears a hood through which air is drawn by an exhaust blower. Oxygen concentration is maintained constant by a servo-controlled blower, so that flow rate is essentially proportional to oxygen uptake. The flow rate of the main stream was measured by a time-of-flight flow-meter located in the exhaust hose. Oxygen concentration was measured by a limiting current oxygen sensor. The signals representing flow rate and oxygen concentration were digitized and stored in a memory. All of the equipment was assembled in a small package (wt= 3 kg) which the subject carries on his back. The memory chip was removed from the portable device after each experiment. Data were transferred from the memory to a microcomputer and then an oxygen uptake trend was estimated. Response of the system to a step input was about 30 s. Compared with a commercially available oxygen monitoring system (Magna 88, P. K. Morgan, England), the maximum error was 7.2% of full scale within the range of 0.25 to 2.1 1/min of oxygen uptake. The oxygen uptake of exercising human subjects measured with this system showed good agreement with that obtained by a conventional oxygen monitor (r=0.973 for cycle ergometer, r=0.932 for treadmill). This portable device was able to measure oxygen uptake in subjects during daily activities, and also while driving a car, without disturbance.

已经开发出一种用于长时间测量摄氧量而不会造成不适的监测装置。该系统所依据的原理是开放流通系统。对象戴着头罩，通过该头罩，排气鼓风机吸入空气。氧气浓度通过伺服控制鼓风机保持恒定，因此流量基本上与吸氧量成正比。主流的流速由位于排气软管中的飞行时间流量计测量。通过极限电流氧传感器测量氧气浓度。代表流速和氧气浓度的信号被数字化并存储在存储器中。所有设备都组装在一个小包裹（重量= 3公斤）中，受试者将其背在背上。每次实验后，将存储芯片从便携式设备中取出。数据从存储器传输到微型计算机，然后估计摄氧量趋势。系统对阶跃输入的响应约为 30 秒。与市售氧气监测系统（Magna 88，P.K. Morgan，英国）相比，在摄氧量 0.25 至 2.1 1/min 范围内，最大误差为满量程的 7.2%。使用该系统测量的运动受试者的摄氧量与传统氧监测仪获得的摄氧量非常一致（自行车测力计的r = 0.973，跑步机的r = 0.932）。这种便携式设备能够在不受干扰的情况下测量受试者在日常活动以及驾驶汽车时的摄氧量。