### The validity of the Moxus Modular metabolic system during incremental exercise tests: impacts on detection of small changes in oxygen consumptionThe validity of the Moxus Modular metabolic system during incremental exercise tests: impacts on detection of small changes in oxygen consumption

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 Author Beltrami, Fernando G. ♦ Froyd, Christian ♦ Mamen, Asgeir ♦ akes, Timothy D. Source SpringerLink Content type Text Publisher Springer Berlin Heidelberg File Format PDF Copyright Year ©2014 Language English
 Subject Domain (in DDC) Technology ♦ Medicine & health Subject Keyword Criterion validity ♦ Douglas Bag method ♦ Gas exchange ♦ Oxygen uptake ♦ Moxus Modular metabolic system ♦ Human Physiology ♦ Occupational Medicine/Industrial Medicine ♦ Sports Medicine Abstract We investigated the accuracy of the Moxus Modular Metabolic System (MOXUS) against the Douglas Bag Method (DBM) during high-intensity exercise, and whether the two methods agreed when detecting small changes in $\dot{V}{\text{O}}_{2}$ between two consecutive workloads ( $\Delta {\dot{{V}}\text{O}}_{ 2}$ ).Twelve trained male runners performed two maximal incremental running tests while gas exchange was analyzed simultaneously by the two systems using a serial setup for four consecutive intervals of 30 s on each test. Comparisons between methods were performed for $\dot{V}{\text{O}}_{2}$ , ${\dot{{V}}}_{\text{E}}$ , fractions of expired O2 (FeO2) and CO2 (FeCO2) and $\Delta {\dot{{V}}\text{O}}_{ 2}$ .The MOXUS produced significant higher (mean ± SD, n = 54) readings for $\dot{V}{\text{O}}_{2}$ (80 ± 200 mL min−1, p = 0.005) and ${\dot{{V}}}_{\text{E}}$ (2.9 ± 4.2 L min−1, p < 0.0001), but not FeO2 (−0.01 ± 0.09). Log-transformed 95 % limits of agreement for readings between methods were 94–110 % for $\dot{V}{\text{O}}_{2}$ , 97–108 % for $\dot{V}_{\text{E}}$ and 99–101 % for FeO2. $\Delta \dot{V}{\text{O}}_{2}$ for two consecutive measurements was not different between systems (120 ± 110 vs. 90 ± 190 mL min−1 for MOXUS and DBM, respectively, p = 0.26), but agreement between methods was very low (r = 0.25, p = 0.12).Although it was tested during high-intensity exercise and short sampling intervals, the MOXUS performed within the acceptable range of accuracy reported for automated analyzers. Most of the differences between equipments were due to differences in $\dot{V}_{\text{E}}$ . Detecting small changes in $\dot{V}{\text{O}}_{2}$ during an incremental test with small changes in workload, however, might be beyond the equipment’s accuracy. ISSN 14396319 Age Range 18 to 22 years ♦ above 22 year Educational Use Research Education Level UG and PG Learning Resource Type Article Publisher Date 2014-01-30 Publisher Place Berlin/Heidelberg e-ISSN 14396327 Journal European Journal of Applied Physiology Volume Number 114 Issue Number 5 Page Count 10 Starting Page 941 Ending Page 950