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FTP % of MAP will properly rises and you become more trainied, but not by much.
Map tests are a good, repeatable, reliable way of testing improvement.
Some will be better at a map than 1h FTP/20 min FTP test. Some won't be able to suffer.
But it's still repeatable.I'd rate MAP tests as a method of tracking improvement.
Though if you want to know what your FTP is, go out and do a 40k TT when rested. That's what it is, everything else is an estimation.
On the fourth day the Lord said unto Adam; read the Coggan book - do not eat the fruit from the powermeter thread on lfgss.