netscriber said:umm..yes, I have an HRM and constantly test my fitness and LTHR.
My max HR is 194, resting 60 and LTHR 178. I do my LTHR test every month and it has gone up from 165 to 178.
And I am basing my comments and observations on my 1-1.5hr lunch rides. Every month I do a TT on the exact same terrain and try to be as close as possible as far as headwind/temperature...food, feeling etc are concerned.
My TT average with sustainable power(HR that I can manage) for that 1.5hrs has not gone up. I still average 15mph. I had posted another thread for my plateau about a month and ahlaf back and everyone suggested intervals. And yes I introduced intervals. And yes I am getting extremely frustrated and mostly depressed that I cannot see my progress after so much hard work. I hav a life and family now and within all this struggle when I do not get ANY RESULTS at all it drives me nuts.
Sorry, I misunderstood your comments about z2 and 4-hrs and thought you meant that was where you were seeing the 15mph figure. Just out of curiosity, what's your comfortable endurance speed for those rides?
So, your HR @ LT has increased 13 bpm, but you can't pedal the bike any faster? How can that be? You should be able to hold LT (or OBLA) power and HR for an hour, so your TT HR should be close to 178 bpm, and that's where you should be doing your cruise intervals too, right? What's your average HR on your TT's?
Don't take this the wrong way, but reading this I just can't help but think that somehow you're mentally sandbagging on those tests. Everything else seems to indicate that your body is responding to the training.