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It does, I guess if @dbr did a max 1h effort, his legs would have built up lactic to the point where he would need to stop. If his legs are very aerobic compared to the rest of his CV sytem, and just builds up lactic slowly, then for 3-5m efforts, might not be a big issue.
I find it difficult to concentrate at FTP, because of the pain. If I am above FTP, the pain increases to the point I can't pedal any more, rather than feeling like I've run out of air/performance. My interpretation of increasing FTP is experiencing the same level of pain, but pedalling a bit faster/harder.
My mind is boggling at the idea that you don't. Even the term "threshold" is derived from/related to lactate threshold isn't it?