Unable to finish Threshold but VO2 is Fine - Why?

Training
2

  1. Testing - if you find vo2 max easier than threshold and you test by the ramp test your FTP could be overestimated by the anaerobic contributions. So your O/U could be over overs. Try longer test - try holding power for 35-40 minutes as a start point. It should be a lot closer to your FTP. You will find a lot of info in different topics. And I recommend this topic for additional info about longer test:
    Kolie Moore's FTP test protocol - #443 by paulgrav

  2. What happens over FTP is highly individual. Ability to do vo2 max is not in relation to FTP. That is why doing vo2 max by the percentage of FTP is usually not very useful. It all depends where your FTP is in relation to pVO2 max and how your anaerobic capacity looks like.

  3. My personal experience with doing threshold and O/U is that doing longer Z2 rides helps a lot in terms of improving substrate utilisation and lactate clearing. With wrong FTP o/u can be not doable.
    A little bit more info in a older topic of mine:
    Threshold riding for beginners
    Maybe you will find something helpful there.

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