Thank you. Can you and/or other forum members (perhaps @约瑟夫_拉维尔 @RapAdmin @Paul_2.0 @John_Hemming @AnUser ) who have some thoughts about VO2max etc comment on
Another portable device, Calibre, showed overall a very low (absolute) percentage error (~ −0.63%; Table 2, Figure 2). To the best of our knowledge, this is the only CPET device to employ machine learning to predict gas exchange variables from the measured values, which allowed it to achieve high accuracy, at a substantially lower cost than other (wearable) devices (Table 1). Moreover, in contrast to most other wearable devices, Calibre does not require the user to wear a data collection unit, which is beneficial for activities such as running, cycling, or and daily life activities where extra mass or restraints may influence performance and limit the ability to obtain valid measures.
Above does seems promising, forum members what is your view?
Nevertheless, when solely considering accuracy, the devices that perform relatively well (i.e., <5% average absolute percentage error over both gas exchange and substrate/energy outcomes; Table S8) include Oxycon Pro, Vyntus CPX, Calibre and Ergocard Pro. Devices with slightly lower accuracy (5%–6% average overall absolute percentage error) include Omnical V6 and K5. In contrast, devices that show low relative accuracy (absolute percentage errors >20%) and/or reliability include VO2masterPro, PNOĒ, and PowerCube Ergo.
forum members what is your view?
Although some mixing chamber systems might thus be more accurate, they have a lower temporal resolution and need a longer time to achieve a steady state in gas exchange variables. This longer time required to reach a steady state may reduce the appearance of a plateau in V̇O2max.55 We quantified the time to achieve steady state for the mixing chamber devices assessed in our study, with this being up to 3 min for Calibre, up to 90 s for Oxycon Pro mixing chamber and 140 s for Omnical V6. As some individuals may need a shorter time to achieve metabolic steady state (e.g., 60–90 s56), these findings suggests longer measurements may be required before this steady-state is also accurately reflected in the mixing chamber systems.
@Calibre snd others can you comment on how much that impacts VO2 max testing?
Other context for forum members:
Note that not all systems measured or provided all this additional data. The mixing chamber methodology applied in Omnical V6 and Oxycon Pro does not measure continuously FiO2 and FiCO2 (but rather at the start of a measurement), Calibre does not provide these parameters in the time and breath table output, and VO2masterPro determines only mixed FeO2 values.
ACKNOWLEDGEMENTS
No funding was received. The authors would like to thank Manon Broekhuijsen from Maastricht University Medical Center+ for allowing us to borrow the metabolic simulator. Additionally, we would like to thank Aimee Boersen, Remy Queisen, and Skip Veugen for their assistance during the experiments and/or data analysis. Finally, we would like to thank all manufacturers that provided equipment and send staff for their cooperation.
CONFLICT OF INTEREST STATEMENT
The authors do not report any conflicts of interest or relationships with any of the companies. The results of the study are presented clearly, honestly, and without fabrication, falsification, or inappropriate data manipulation.
