Accuracy of the Cosmed K5 portable calorimeter


Autoři: Scott E. Crouter aff001;  Samuel R. LaMunion aff001;  Paul R. Hibbing aff001;  Andrew S. Kaplan aff001;  David R. Bassett, Jr. aff001
Působiště autorů: Department of Kinesiology, Recreation, and Sport Studies, The University of Tennessee Knoxville, Knoxville, TN, United States of America aff001
Vyšlo v časopise: PLoS ONE 14(12)
Kategorie: Research Article
doi: 10.1371/journal.pone.0226290

Souhrn

Purpose

The purpose of this study was to assess the accuracy of the Cosmed K5 portable metabolic system dynamic mixing chamber (MC) and breath-by-breath (BxB) modes against the criterion Douglas bag (DB) method.

Methods

Fifteen participants (mean age±SD, 30.6±7.4 yrs) had their metabolic variables measured at rest and during cycling at 50, 100, 150, 200, and 250W. During each stage, participants were connected to the first respiratory gas collection method (randomized) for the first four minutes to reach steady state, followed by 3-min (or 5-min for DB) collection periods for the resting condition, and 2-min collection periods for all cycling intensities. Collection periods for the second and third methods were preceded by a washout of 1–3 min. Repeated measures ANOVAs were used to compare metabolic variables measured by each method, for seated rest and each cycling work rate.

Results

For ventilation (VE) and oxygen uptake (VO2), the K5 MC and BxB modes were within 2.1 l/min (VE) and 0.08 l/min (VO2) of the DB (p≥0.05). Compared to DB values, carbon dioxide production (VCO2) was significantly underestimated by the K5 BxB mode at work rates ≥150W by 0.12–0.31 l/min (p<0.05). K5 MC and BxB respiratory exchange ratio values were significantly lower than DB at cycling work rates ≥100W by 0.03–0.08 (p<0.05).

Conclusion

Compared to the DB method, the K5 MC and BxB modes are acceptable for measuring VE and VO2 across a wide range of cycling intensities. Both K5 modes provided comparable values to each other.

Klíčová slova:

Body temperature – Carbon dioxide – Exercise – Fluid flow – Oxygen – Oxygen metabolism – Respiration – Vapor pressure


Zdroje

1. Overstreet BS, Bassett DR Jr., Crouter SE, Rider BC, Parr BB. Portable open-circuit spirometry systems. J Sport Med Phys Fit. 2017;57: 227–37.

2. Macfarlane DJ. Open-circuit respirometry: a historical review of portable gas analysis systems. Eur J Appl Physiol. 2017;117: 2369–86. doi: 10.1007/s00421-017-3716-8 29043499

3. McLaughlin JE, King GA, Howley ET, Bassett DR Jr., Ainsworth BE. Validation of the COSMED K4b2 portable metabolic system. Int J Sports Med. 2001;22: 280–4. doi: 10.1055/s-2001-13816 11414671

4. McNaughton LR, Sherman R, Roberts S, Bentley DJ. Portable gas analyser Cosmed K4b(2) compared to a laboratory based mass spectrometer system. J Sport Med Phys Fit. 2005;45: 315–23.

5. Duffield R, Dawson B, Pinnington HC, Wong P. Accuracy and reliability of a Cosmed K4b2 portable gas analysis system. J Sci Med Sport. 2004;7: 11–22. doi: 10.1016/s1440-2440(04)80039-2 15139160

6. Pinnington HC, Wong P, Tay J, Green D, Dawson B. The level of accuracy and agreement in measures of FEO2, FECO2 and VE between the Cosmed K4b2 portable, respiratory gas analysis system and a metabolic cart. J Sci Med Sport. 2001;4: 324–35. 11702919

7. Shephard RJ, Aoyagi Y. Measurement of human energy expenditure, with particular reference to field studies: an historical perspective. Eur J Appl Physiol. 2012;112: 2785–815. doi: 10.1007/s00421-011-2268-6 22160180

8. Meyer T, Davison RCR, Kindermann W. Ambulatory gas exchange measurements—Current status and future options. Int J Sports Med. 2005;26: S19–S27. doi: 10.1055/s-2004-830507 15702452

9. Guidetti L, Meucci M, Bolletta F, Emerenziani GP, Gallotta MC, Baldari C. Validity, reliability and minimum detectable change of COSMED K5 portable gas exchange system in breath-by-breath mode. PloS one. 2018;13: e0209925. doi: 10.1371/journal.pone.0209925 30596748

10. Perez-Suarez I, Martin-Rincon M, Gonzalez-Henriquez JJ, Fezzardi C, Perez-Regalado S, Galvan-Alvarez V, et al. Accuracy and Precision of the COSMED K5 Portable Analyser. Front Physiol. 2018;9: 1764. doi: 10.3389/fphys.2018.01764 30622475

11. Dixon PM, Saint-Maurice PF, Kim Y, Hibbing P, Bai Y, Welk GJ. A Primer on the Use of Equivalence Testing for Evaluating Measurement Agreement. Med Sci Sports Exerc. 2017.

12. Bland JM, Altman DG. Statistical methods for assessing agreement between two methods of clinical measurement. The Lancet. 1986;1: 307–10.

13. Darter BJ, Rodriguez KM, Wilken JM. Test-retest reliability and minimum detectable change using the K4b2: oxygen consumption, gait efficiency, and heart rate for healthy adults during submaximal walking. Res Q Exerc Sport. 2013;84: 223–31. doi: 10.1080/02701367.2013.784720 23930548

14. Ward SA. Open-circuit respirometry: real-time, laboratory-based systems. Eur J Appl Physiol. 2018;118: 875–98. doi: 10.1007/s00421-018-3860-9 29728765

15. Marsh AP, Martin PE. The Association between Cycling Experience and Preferred and Most Economical Cadences. Med Sci Sports Exerc. 1993;25: 1269–74. 8289615

16. Scholander PF. Analyzer for accurate estimation of respiratory gases in one-half cubic centimeter samples. J Biol Chem. 1947;167: 235–50. 20281644


Článek vyšel v časopise

PLOS One


2019 Číslo 12