Ok, it a pretty generic term. Interestingly the summary has “IMAP” all over it but not enough for me to buy it.
Conversation was on a Zwift Rider FB post (can’t find the post anymore) where Ric chimed in with the same puzzlement on Zwift’s promotion of a 3 minute step test and added service for expert administration with blood sampling. Granted it wasn’t officially a Zwift product but a friend of Zwiftcast (don’t see it as other than an arm of Zwift’s advertisement). There was also an article that combined www.cyclingnews.com fitness and training information, https://cyclingtips.com/2010/01/how-to-do-a-map-ramp-test/, and https://cyclingtips.com/2008/12/test-your-lactic-threshold/ into single discussion on the derivation of the test protocol. I’m unable to find it anymore.
I believe 3 minutes was for running and reason behind the 2/3 minute step was something about stabilizing the heart rate. This graph should look familiar.
Taken from Performing a Lactate Threshold Test