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Development of an automated system for assessing respiratory gas exchange:By mixing chamber method Yoshifumi Yasuda 1 , Kouichi Shigematsu 2 , Shirou Usui 2 , Miharu Miyamura 3 1Research Center of Human Performance and Exercise Physiology, Toyohashi University of Technology 2Department of Information and Computer Science. Toyohashi University of Technology 3Research Center of Health Physical fitness and Sports, Nagoya University pp.631-638
Published Date 1987/6/15
DOI https://doi.org/10.11477/mf.1404205074

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  • Abstract
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A computer based-system for assessing respira-tory gas exchange was developed, some problems and accuracy of the system was examined. The system was consisted of mass spectrometer, Fleisch type pneumotachograph, and microcomputer. Six different types of mixing chamber, 2 or 4 liters cylindrical chamber, were prepared to evaluate the responsiveness and mixture to the expired gas. Four liters mixing chamber with central partition in the cylinder had better responsiveness and gas mixture than other chamber. In this chamber, however, itneeds about 15~20 sec to reach a steady level in gas mixture at constant flow rates with 40 or 80 l/min. The accuracy of this system compared with Douglas bag method were within ±5% in minute ventilation, within + 10% in O2 uptake (V02) and CO2 production (VCO2), respectively. Since the dif-ferences in O2 and CO2 concentration (FEO2, FECO2) determined by the system and Douglas bag method was small as gas delay time with 10 or 15 seconds was corrected, errors in VO2 and VCO2 would be thought to depend on the noncorrection for the gas delay time in multiplication between VE and FEO2 or FECO2.


Copyright © 1987, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1200 印刷版ISSN 0452-3458 医学書院

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