| Q-NRG® | Deltatrac® |
---|---|---|
Deltatrac® (Datex, Finland) | - (No) significant difference in measured REE [16] - Measurements using Q-NRG® significantly faster [16] |  |
QUARK RMR® (Cosmed, Italy) | - Significant difference in measured REE (p = 0.038) - Measurements using Q-NRG® significantly faster [16] | - No significant difference in mean REE (p = 0.166) - No significant differences EE, VCO2, and VO2 [66] - Significant difference in RQ (p < 0.0001) not favoring Deltatrac®, due to measurement values outside the physiological range [60] - Overestimation of VO2 and VCO2 by QUARK RMR® [67] |
Vmax® (Vyaire, USA) | - Significant difference in measured REE (p < 0.001) - Measurements using Q-NRG® significantly faster [16] | - No significant difference in REE (p = 0.8) is not reliable enough in a clinical research setting [65] |
E-COVX® (Datex-Ohmeda, Finland) | - No significant difference in measured REE (p = 0.165) - No significant difference in the duration of measurement | - Overestimation of VO2 and VCO2 by E-COVX® [67] |
CCM Express® (Medgraphics, USA) |  | - Significant difference in mean REE (p < 0.0001) - Significant difference in RQ (p < 0.0001) - Significant differences in RQ and VO2 and VCO2 (p < 0.0001) [66] |