Originally Posted by PeteHski

I was thinking more of the affect time v intensity has on shorter, but very hard rides, like sub 2 hours. The interesting thing for me this year is that reducing volume / increasing intensity has actually improved my Zwift racing (higher FTP and VO2 max), but definitely taken the edge off my endurance over 4+ hour hilly rides (more drop off in endurance power >2-3 hours). When I was doing 10+ hour weeks I had better endurance, but was less punchy. Now I'm wondering if I can increase volume at low intensity to regain my endurance without losing power gained at threshold and above. I think it might work if I'm strict with the low intensity and don't cause too much additional fatigue.