[Scott Johnston]

Radu:

I use the same protocol with Tom Evans who is self-testing during some of his workouts (not for zone determination). As long as the protocol is close to the same each time you test you will be comparing apples to apples as they say. You do not really care what the absolute Lactate number is, you care what it is relative to you and the last time you did the same effort. If the protocol is the same I think you are wise to accept the number. I’ve no experience with the shirt you mention. I think nose breathing is an amazingly accurate ventilation test and pretty cheap compared to a fancy shirt with sensors. 😉

I hope that helps,
Scott