Development of a Portable Respiratory Gas Analyzer for Measuring Indirect Resting Energy Expenditure (REE)

Figure 5

The flow rate sensor-based respiratory gas analyzer is accurately calibrated from flow rate to volume flow, which is repeated six times in 500, 1000, 1500, 2000, 2500, and 3000 ml, respectively. (a) When a volume of 500 ml was passed through the gas analyzer, the speed value obtained from the sensor was fitted. To identify dependency, the test is performed four times at similar speeds (A.1∼A.4) and two times at changing the speeds (A.5∼A.6). (b) The average value of under area integration of raw flow rate is fitted at each volume. As a result, the accuracy was obtained with linearity and an error rate of not more than 3%.

(a)

(b)