Congruent validity and reliability of two metabolic systems to measure resting metabolic rate

Whitney Allegra Welch*, S. J. Strath, A. M. Swartz

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


Determine the congruent validity and intra- and inter-day reliability of RMR measures assessed by the ParvoMedics Trueone 2-400 hood dilution method (Parvo) and Cosmed K4b2 (Cosmed) breath-by-breath metabolic systems. Participants underwent 6 RMR assessments over 2 consecutive mornings, 3 with the Parvo (Day 1: Parvo 1; Day 2: Parvo 2, 3), 3 with the Cosmed (Day 1: Cosmed 1; Day 2: Cosmed 2, 3). Measured VE, FEO2, FECO2, VO2, VCO2, kcal/day, and HR values were averaged over a minimum of 10-min. Intra- and inter-day reliability within each system was determined with RMANOVA, and congruent validity was assessed via paired sample t-tests. 31 participants (13 females, 18 males; 27.3±7-years, 24.8±3.1-kg.m2) completed the study. There were no significant differences in any within or between day Parvo values or Cosmed values. When systems were compared, there was a significant difference between VE (Parvo2: 25.03-L/min, Cosmed2: 8.98-L/min) and FEO2 (Parvo2: 19.68%, Cosmed2: 16.63%), however, there were no significant difference in device-calculated RMR (kcals/day). The Parvo and Cosmed are reliable metabolic system with no intra- or inter-day differences in RMR. Due to differences in measurement technology, FEO2, VE were significantly different between systems, but the resultant RMR values were not significantly different.

Original languageEnglish (US)
Pages (from-to)414-418
Number of pages5
JournalInternational Journal of Sports Medicine
Issue number5
StatePublished - May 1 2015


  • energy expenditure
  • indirect calorimetry
  • measurement
  • oxygen consumption

ASJC Scopus subject areas

  • Physical Therapy, Sports Therapy and Rehabilitation
  • Orthopedics and Sports Medicine


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