I seem to suck at vo2 intervals when the effort is over 105% for longer periods (3 mins +) . For example, last night was supposed to be 7x5min @ 108%. https://www.trainerroad.com/cycling/rid ... elm-custom
I had to stand up on the 4th and 5th after about 3 minutes, reduce the effort on the 6th and bailed on the 7th, had nothing left in the legs. I use trainerroad for most of my structured workouts and those that stick to 105% are generally fine. Hard, but do-able. HR/effort in the right place. Go above this and I struggle.
I am trying to figure out what, and if, I can do about this.
Generally, all other sessions are where I would expect them to be. Endurance is just that, with a good low HR. Sweet spot looks to be good, HR actually lower than my zones indicate for a given % FTP, but effort about right.
SS/Threshold - https://www.trainerroad.com/...pot-threshold-custom
Endurance - https://www.trainerroad.com/...des/6044157-fletcher
Short Vo2 - https://www.trainerroad.com/.../rides/6030958-baird
Outdoor sessions although not structured give expected (sometimes even better) results. For example, a club ride gave a nominal power of 92% FTP for close to 3 hours at the weekend.
Based on this, although I very rarely 'officially' test my FTP, I do think it's close, very close in fact.
So, I should be able to do these intervals. I am not new to training, I am relatively unfatigued (-14.5 TSB)
Is it imperative that I get some longer vo2 in at 108%+, or is something like 8 x3min @ 105% sufficient. Are the 1min on/1min off a good alternative?
Could it be a muscular endurance issue and build in more of this before progressing to longer Vo2?
Any input would be appreciated.