![]() 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). Repeated measures ANOVAs were used to compare metabolic variables measured by each method, for seated rest and each cycling work rate.įor 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). Collection periods for the second and third methods were preceded by a washout of 1-3 min. 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. 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.įifteen participants (mean age±SD, 30.6☗.4 yrs) had their metabolic variables measured at rest and during cycling at 50, 100, 150, 200, and 250W.
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