Originally Posted by terrymorse
It depends. If I'm fatigued, it can take 10 minutes or so to get to 90%. If I'm really fatigued, I won't be able to sustain 90% at all. That's when I know it's time to take a rest day.
If I'm rested and reasonably warmed up, I can reach 90% in 2-3 minutes.
It could be that I needed some more warmup but I was well rested last night when doing the 30 min. Had a big nap and everything. Felt pretty fresh.
I would have to be very warmed up or be on a 2 - 3 hour temp ride to be able to get to 90% in 2 - 3 minutes. The longer the ride the easier it is for me to achieve the higher heart rates. That's what's so odd. I can have the same average HR for a 3 hour ride as I can for a 30 minute all out effort. And I am hydrating well on the long efforts so I'm sure that much cardiac drift isn't due to dehydration.