Accuracy of the Cosmed K5 portable calorimeter.
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 m...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2019-01-01
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| Series: | PLoS ONE |
| Online Access: | https://doi.org/10.1371/journal.pone.0226290 |
| _version_ | 1818578044404629504 |
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| author | Scott E Crouter Samuel R LaMunion Paul R Hibbing Andrew S Kaplan David R Bassett |
| author_facet | Scott E Crouter Samuel R LaMunion Paul R Hibbing Andrew S Kaplan David R Bassett |
| author_sort | Scott E Crouter |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-16T06:39:33Z |
| format | Article |
| id | doaj.art-8d0e28b23ce84daabd72730c0ed69e72 |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-12-16T06:39:33Z |
| publishDate | 2019-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-8d0e28b23ce84daabd72730c0ed69e722022-12-21T22:40:44ZengPublic Library of Science (PLoS)PLoS ONE1932-62032019-01-011412e022629010.1371/journal.pone.0226290Accuracy of the Cosmed K5 portable calorimeter.Scott E CrouterSamuel R LaMunionPaul R HibbingAndrew S KaplanDavid R BassettPURPOSE: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.https://doi.org/10.1371/journal.pone.0226290 |
| spellingShingle | Scott E Crouter Samuel R LaMunion Paul R Hibbing Andrew S Kaplan David R Bassett Accuracy of the Cosmed K5 portable calorimeter. PLoS ONE |
| title | Accuracy of the Cosmed K5 portable calorimeter. |
| title_full | Accuracy of the Cosmed K5 portable calorimeter. |
| title_fullStr | Accuracy of the Cosmed K5 portable calorimeter. |
| title_full_unstemmed | Accuracy of the Cosmed K5 portable calorimeter. |
| title_short | Accuracy of the Cosmed K5 portable calorimeter. |
| title_sort | accuracy of the cosmed k5 portable calorimeter |
| url | https://doi.org/10.1371/journal.pone.0226290 |
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