| Project/Area Number |
63870009
|
|---|
| Research Category |
Grant-in-Aid for Developmental Scientific Research (B).
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
環境生理学(含体力医学･栄養生理学)
|
|---|
| Research Institution | Institute for Medical and Dental Engineering, Tokyo Medical and Dental University |
|---|
Principal Investigator |
TOGAWA Tatsuo Institute for Medical and Dental Engineering, Professor Tokyo Medical and Dental University, 医用器材研究所, 教授 (40013859)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
TAMURA Toshiyo Same as above Research Associate, 助手 (10142259)
TOYOSHIMA Takeshi Same as above Research Associate, 助手 (40014146)
TSUJI Takayuki Same as above Associate Professor, 助教授 (00075764)
|
|---|
| Project Period (FY) |
1988 – 1990
|
| Project Status |
Completed (Fiscal Year 1990)
|
| Budget Amount *help |
¥6,300,000 (Direct Cost: ¥6,300,000)
Fiscal Year 1990: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1989: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1988: ¥3,200,000 (Direct Cost: ¥3,200,000)
|
|---|
| Keywords | Portable device / Oxygen uptake / Flow-through system, / Servo-control / Respiratory monitoring / Limiting current-type oxygen sensor / Time-of-flight-flowmeter / 呼吸流量計 / 酸素消費量 / サーボ制御 |
|---|
| Research Abstract |
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.
|
