Evaluation of a thermal-based flow meter for assessment of mobile resting metabolic rate measures

Nai Yuan Liu, Yue Deng, Francis Tsow, Devon Bridgeman, Xiaojun Xian, Jane J. Dean, Janet L. Wilson, Nongjian Tao, Doina Kulick, Erica Forzani

Research output: Contribution to journalArticle

Abstract

This work evaluates the use of a new flow meter to assess exhalation rate. A mobile indirect calorimeter (MIC) was designed and used to measure resting metabolic rate (RMR), which relies on the measure of O 2 consumption rate (VO 2 ) and CO 2 production rate (VCO 2 ). The device was produced from a commercially available and well-established indirect calorimeter and implemented with a new flow meter for the purpose of this study. VO 2 and VCO 2 were assessed by measuring exhalation rates using the new flow meter and O 2 and CO 2 concentrations in breath using the original colorimetric sensors of the indirect calorimeter. The new flow meter was based on a thermal flow meter (TFM) affixed to an orifice with a diameter of 6.8 mm used as a passage for exhaled breath from 16 subjects. The results were compared with a metabolic cart (Medical Graphics), which was connected in series to the modified device. We found that 69% of the results had more than a 10% difference between the modified MIC device and the reference instrument, suggesting that the sensitivity of the thermal flow meter changed over time, which precluded its use as a flow meter for breath flow rate measurement.

Original languageEnglish (US)
Article number9186475
JournalJournal of Sensors
Volume2018
DOIs
StatePublished - Jan 1 2018

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evaluation
calorimeters
Calorimeters
exhalation
voltage controlled oscillators
Variable frequency oscillators
carts
orifices
Hot Temperature
Orifices
flow velocity
Flow rate
sensitivity
sensors
Sensors

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Instrumentation
  • Electrical and Electronic Engineering

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Evaluation of a thermal-based flow meter for assessment of mobile resting metabolic rate measures. / Liu, Nai Yuan; Deng, Yue; Tsow, Francis; Bridgeman, Devon; Xian, Xiaojun; Dean, Jane J.; Wilson, Janet L.; Tao, Nongjian; Kulick, Doina; Forzani, Erica.

In: Journal of Sensors, Vol. 2018, 9186475, 01.01.2018.

Research output: Contribution to journalArticle

Liu, Nai Yuan ; Deng, Yue ; Tsow, Francis ; Bridgeman, Devon ; Xian, Xiaojun ; Dean, Jane J. ; Wilson, Janet L. ; Tao, Nongjian ; Kulick, Doina ; Forzani, Erica. / Evaluation of a thermal-based flow meter for assessment of mobile resting metabolic rate measures. In: Journal of Sensors. 2018 ; Vol. 2018.
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