The ramp test is based off off previously developed max aerobic power test which was designed to give estimate of vo2 max. Ftp is a surrogate for lactate threshold, a slightly different physiologic marker. They are guesstimating ftp because vo2 max correlates with this. If you are having big discrepancies but are testing correctly you should probably use ramp test ftp for vo2 max work and 20 min ftp for sweet spot work. Also, a big discrepancy may mean one area is just undertrained, especially in the new athlete.
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