Help - I can't seem to improve my threshold power?!!

I am frustrated that although I train consistently I don't seem to be able to increase my functional threshold power which has been stuck around 220 Watts for the last year. I am 53 and train 6 days a week putting in about 120-150 miles a week including 2x 1hr interval sessions, 2x strength training in the gym and 2x longer rides at the weekend of up to 3 hours. But whatever I do my FTP seems to stick at 210-220W. Any advice on what to do to put out more watts? Am I training too much??
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If you can spare that much time, then structured training will work wonders.
Pete
Now there may be issues aside from training but if we confine our cursory examination just to training it's possible you are not training the right things for your needs, or training enough to stimulate further adaptation and probably a combination of each.
As others have said, what is the content of your 2 x 1 hour interval sessions.
ISTM you are doing a lot of training, even if it's not optimal, so there are unlikely to be easy big gains. And unless your target is 25 mile TTs there may be other places to look for optimisations.
So, what do you want to be better at?
Paul
I'm interested in trying to raise/ measure mine but I have no way of measuring it, is that a way to get some kind of aprox measurement by riding hard for that amount of time
Do you have a turbo trainer? A quick, cheap and not-too-inaccurate method would be to measure your best average speed over 20 minutes, after a set, repeatable warm-up protocol (including a couple of all-out efforts). The key is repeatability, ie same tyre, same tyre pressure, the lot. And it is only relevant to you. It would let you see you much stronger you get though.
A lot of software tools use this method, they then compare it to a known reference point to give you a "virtual power" reading. It is only approx though.
Also once you have raised it by such an intensive effort can it slip back or can you maintain it by slightly reducing the intensity by keeping the work load the same
What I'm wondering is under these circumstance at this age would say 20 watts be acheivable, or very difficult or is more possible say over a 12 months training or would it take less time
If what you are asking is 'are you already as fit as you can possibly be at your age?' - then the answer is almost certainly going to be 'no'. Having said that, nobody can tell you what likely power gain you may/may not achieve over a given time.
The best thing to do is follow good process and not to set a limit on what the impact on power will be.
But as a guide, a 10% variation between off season (but still training) and peak seasonal race form is about a normal annual variance in power output. What improvement one can make from season to season is then a matter of their commitment to the process, time and training opportunity, and whether they picked the right parents.
the other guy has said what I would also say a big shift in volume for me helped alot. I used to do 10-12hrs a week and have an with an actual average power for 1hr of about 210W-220W. I doubled my volume and start doing more intervals and power I can sustain for 1 hour (real average for 1 hour) shot up to a peak of 270W this year. I dont do 20 minute tests as I never ride like that. What I am more interested in how much I can deliver over an hour in a race as some races are one hour.
However some riders see similar improvement from doing 10-12hrs a week on a turbo mostly doing intervals in a structured way. I know that would not work for me. As alex said everyone responds differently to training and it also depends on what you are trying to acheive. Improve your FTP for what end? IT is also not just FTP that is important but your ability to recover after hard efforts and go again. Although the the two are connected they I think are not trained the same way.
Quality rather than quantity.
Others like me if they did 5hrs a week I would struggle on a club run.
Everyone is different.