I wouldn’t call riding at threshold “all out” , maybe something like vo2 intervals, sprints, ramp tests and 8 minute tests.
I am Not perfect with RPE either but I do know the feeling of “if I go any harder I’ll blow up.
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It is if that effort is about an hour long.
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Only for the last 5-10 minutes though. The first 20-25 minutes doesn’t feel that bad but then it starts to go to hell pretty quickly.
But that’s the same for a 10 minute MMP, it’s the last 2-3 that are all out. 5 Minutes, it’s the last 60 seconds, and so on.
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ain’t that the truth!!!
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SOLUTION - it’s a weird one…
August 2024 I had a minor crash and visited A&E just to get checked out. I had hurt my neck in the crash so they did a full check over including a CT scan. They found no issues from the crash, but they did find I had undiagnosed Coarctation of the Aorta. It’s a congenital heart defect where the aorta is narrowed causing hypertension and decreased blood flow to the lower half of the body.
I’d never had any symptoms so I was understandably shocked by this diagnosis!
May 2025, I’ve now had a stent fitted to open up the aorta and prevent further issues in the future. This has to be checked up every couple of years but apart from that I was told just to go back to normal life.
After a short break I got back on my bike and training again. I felt stronger week by week, slowly regaining my fitness. Then the power PBs started to fall…
I have been riding for about eight years and in the past few months I have smashed every power PB across all time and then broken them again the next week. The rate of improvement has shocked me and I can only put the change down to my stent. My FTP is the highest ever (245, 3.5). The most marked improvement is in the sweet spot and threshold zones. I can finally do the workouts! I don’t fall apart after a few minutes and can just keep pushing.
At first I wondered if it was just my power meter being generous but real world results don’t lie. PBs up every local climb and I can finally hang with the fast group on the local club ride.
I’m over the moon and super excited to see how far I can go. Credit to TR, the app have been so helpful in building fitness in a sustainable way.
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This is amazing news! Very much looking forward to updates. 
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Wow! This is fascinating! Im glad you got an answer and things are sorted 