Accuracy and reliability of the ParvoMedics TrueOne 2400 and MedGraphics VO2000 metabolic systems
Abstract
This study examined the accuracy and reliability of the MedGraphics VO2000 (VO2000) portable metabolic system and the ParvoMedics TrueOne 2400 (TrueOne 2400) metabolic cart against the criterion Douglas bag (DB) method. Ten healthy males (age 20 +/- 1.7 years) had their gas exchange variables measured at rest and during cycling at 50, 100, 150, 200, and 250 W. Each stage was 10-12 min. For half of the stage gas exchange was measured with the DB and TrueOne 2400 simultaneously and for the other half of the stage gas exchange was measured with the VO2000. The testing was performed on two separate days and the order in which the equipment was used in each stage was randomized. Reliability between days for V (E) (CV 7.3-8.8%) was similar among devices, however, for VO2, and VCO2 the VO2000 (CV 14.2-15.8%) was less reliable compared to the DB (CV 5.3-6.0%) and TrueOne 2400 (CV 4.7-5.7%). The TrueOne 2400 was not significantly different from the DB at rest or any work rate for V (E), VO2, or VCO2 (P > or = 0.05). The VO2000 was significantly different from the DB for V (E) at 50-100 W, VO2 at rest and 100-250 W, and VCO2 at rest and 200-250 W (all, P < 0.05). The TrueOne 2400 provides accurate and reliable results for the measurement of gas exchange variables. The VO2000 portable metabolic system was less reliable for measuring VO2 and VCO2 and generally overestimates VO2 at most cycling work rates. Further research is needed to confirm the results found with the VO2000.
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For V̇O2, the ParvoMedics TrueOne 2400 metabolic cart study showed a CV of approximately 5%.
“For V̇O2, their results showed a CV of approximately 5%, providing further strength to our findings, especially during the highest workload.”
From Comparing the reliability of muscle oxygen saturation with common performance and physiological markers across cycling exercise intensity (2023) · cites this paper as [52]
TrueOne 2400 has been previously found to be a reliable measure of energy expenditure for research.
“TrueOne 2400 has been previously found to be a reliable measure of EE for research [28].”
From Estimating Accuracy at Exercise Intensities: A Comparative Study of Self-Monitoring Heart Rate and Physical Activity Wearable Devices (2017) · cites this paper as [28]
The typical error of measurement associated with this system and its best practice protocols is ~2.4%, which is half of the values previously reported for criterion Douglas Bag methods or the most accurate commercial metabolic cart systems.
“The typical error of measurement associated with this system and its best practice protocols of use is ~2.4% [48], which is half of the values previously reported for criterion Douglas Bag methods or the most accurate commercial metabolic cart systems [76].”
From Neither beetroot juice supplementation nor increased carbohydrate oxidation enhance economy of prolonged exercise in elite race walkers (2021) · cites this paper as [76]
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- Authors
- Crouter, S. E., Antczak, A., Hudak, J. R., DellaValle, D. M., & Haas, J. D.
- Affiliations
- Cornell University (US)
- Ithaca College (US)
- Corresponding author
- Crouter, Scott E.
- Venue
- European Journal of Applied Physiology
- Published
- 2006-08-03
- Volume
- 98
- Issue
- 2
- Pages
- 139-151
- ISSN
- 0020-9376 (ISSN-L)
- 1439-6319
- 1439-6327
- OpenAlex
- W2123575852
- Cited by
- 240
- References
- 27
- Citations by year
- 2026: 7 · 2025: 10 · 2024: 10 · 2023: 12 · 2022: 13 · 2021: 15 · 2020: 10 · 2019: 19 · 2018: 21 · 2017: 16 · 2016: 16 · 2015: 16 · 2014: 12 · 2013: 12 · 2012: 14
- FWCI
- 11.62
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- www.springer.com/tdm (tdm)
- Locations
- European Journal of Applied Physiology (publishedVersion)
- PubMed (publishedVersion)
- Digital Collections - Ithaca College Library (Ithaca College) (submittedVersion, public-domain)
- Topics
- Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
- Health Sciences › Medicine › Orthopedics and Sports Medicine › Sports Performance and Training
- Health Sciences › Medicine › Surgery › Biomedical and Chemical Research
- Keywords
- gas exchange measurement, oxygen consumption, CO2 emissions, ventilatory equivalents, measurement accuracy, measurement reliability, Douglas bag, cycling exercise, device comparison
- MeSH terms
- Adult, Equipment Design, Exercise Test, Humans, Male, Oxygen, Oxygen Consumption, Pulmonary Gas Exchange, Respiratory Function Tests, Sensitivity and Specificity, Reproducibility of Results, Equipment Failure Analysis
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