The VO2 max test requires complex machinery to accurately measure oxygen and carbon dioxide output.

“what we do is that depending on what kind of modality that's important to you so let say it's is running for example what you'll do is that you get on a treadmill and basically there there's a couple of different let's say ways to do this where let's say the method is pretty much the same but it can be a little bit of a different gear some people will use something that we call mixing chamber system and some people will use what we call breath to breath systems but it would basically involve basically you having either a mouthpiece in your mouth where there sits a sits a um analyzer uh or not an analyzer but it'ss a turbine with a uh sample line from it so basically when you're exhaling in this mask there or to this mouthpiece we are measuring the flow uh or how much air you are breathing in and out per time as a function of uh yeah um yeah if it's a turbine then basically we correlate it to how many how many RPMs this turbine is spinning out so now we know whether you are breathing for example 50 l or 100 L 150 L per per per minute but then of course now we only measure your ventilation we don't know anything about your oxygen consumption yet we only know something about your ventilation so then what we also have to do is we need a sample line that's that sticks in there as well that basically collects now the concentration of oxygen and carbon dioxide as well”

“it would basically involve basically you're having either a mouthpiece in your mouth where there sits a sits a um and analyzer uh or not an analyzer but it's a turbine with a uh sample line from it so basically when you're exhaling in this mask there or to this mouth piece we are measuring the flow uh or how much air you are breathing in and out per time as a function of uh yeah um yeah if it's a turbine then basically we correlate it to how many how many RPMs this turbine is spinning out”