Congruent validity and inter-day reliability of two breath by breath metabolic carts to measure resting metabolic rate in young adults

Nutr Metab Cardiovasc Dis. 2018 Sep;28(9):929-936. doi: 10.1016/j.numecd.2018.03.010. Epub 2018 Mar 30.


Background & aims: Achieving high inter-day reliability is a key factor to analyze the magnitude of change in RMR, for instance after an intervention. The aims of this study were: i) to determine the congruent validity of RMR and respiratory quotient (RQ) with two breath by breath commercially available metabolic carts [CCM Express (CCM) and Ultima CardiO2 (MGU)]; and ii) to analyze the inter-day reliability of RMR and RQ measurements.

Methods & results: Seventeen young adults participated in the study. RMR measurements were performed during two consecutive 30-min periods, on two consecutive days with both metabolic carts. The 5-min period that met the steady state criteria [Coefficient of variance (CV) < 10% for VO2, VCO2, and VE, and CV<5% for RQ] and with the lowest CV average was included in further analysis. RMR values were higher with the MGU than with the CCM on both days (two-way ANOVA, P = 0.021), however, no differences were found on RQ values obtained by both metabolic carts (P = 0.642). Absolute inter-day RMR differences obtained with the MGU were higher than those obtained with the CCM (219 ± 185 vs. 158 ± 154 kcal/day, respectively, P = 0.002; 18.3 ± 17.2% vs. 13.5 ± 15.3%, respectively, P = 0.046). We observed a significant positive association of absolute inter-day differences in RMR obtained with both metabolic carts (β = 0.717; R2 = 0.743; P < 0.001).

Conclusions: The CCM metabolic cart provides lower RMR values and seems more reliable than the MGU in our sample of young adults. Our findings also suggest that a great part of inter-day variability is explained by the individuals.

Keywords: CCM express; Indirect calorimetry; Oxygen consumption; RMR; Resting energy expenditure; Ultima CardiO2.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't
  • Validation Study

MeSH terms

  • Adolescent
  • Adult
  • Age Factors
  • Basal Metabolism*
  • Breath Tests / instrumentation*
  • Breath Tests / methods
  • Calorimetry, Indirect / instrumentation*
  • Equipment Design
  • Female
  • Healthy Volunteers
  • Humans
  • Male
  • Observer Variation
  • Predictive Value of Tests
  • Reproducibility of Results
  • Time Factors
  • Young Adult