Because @Jonathan posted, I’ll post my experience as a comparison. I am 46 years old, I maxxed my volume at 18 hours weekly leading up to the event, had one 24 day stretch where I was on the bike every day, and did a metric s**t ton of SST, Tempo, and Endurance TTE Training. Focused on Extending Endurance as opposed to raising FTP. I was new to structured training in 2022, and this past year in 2023 leading up to Leadville was my first year really pushing Volume up.
18% FTP deduction at Altitude was about the same for me. I arrived in LV two weeks before the race. All numbers after that are based on that “reduced” FTP. My altitude adjusted IF for different segments of the course:
St Kevin’s Climb - 90% (Too Hot)
Mayqueen to Top of Sugarloaf/Powerline - 84%
Bottom of Powerline to Start of Columbine - 79%
Columbine Climb - 76% (Starting to be more conservative)
Bottom of Columbine to Start of Powerline - 71% (Lots of tucked in behind others, defniitely being more conservative, got Hot and Sunny Here too)
Powerline - 73% (Conservative, but also inexperience hoping I didn’t Blow Up)
Mayqueen Climb to St. Kevins, Down, Up to Finish (including the descents) - 85%
Boulevard Climb - 95%
NP for the entire race (as a % of reduced / Leadville FTP) was 77%
I finished with more in the tank, which you can see by how I paced at the end.
So, long story short, volume and TTE / Endurance training can help in how you “Express” your FTP over longer durations.