I always had trouble on my old dumb turbo to get my heart rate up to the higher end of Z4 / low Z5 during interval sessions or hard efforts. Thought this was maybe down to the trainer not being able to generate enough resistance, but the problem persists with the new smart trainer (Elite Direto).
My legs will blow up well before I get to 160bpm. I’ve an FTP of 235W, aged 45, 71kg. Max HR approx 175bpm.
Out on the road when pushing hard on climbs, my HR will be in excess of 160bpm, and I am able to maintain that for a short period, although have no power meter on the road bike to compare against.
When out on a run, I can hold a steady 150bpm for +45 mins at 7:00min/mile pace. That HR on the trainer would last about 10 mins max.
Have tried warming up better before harder efforts on the trainer and improving cooling with a fan and a damp cloth on back of neck, same results.
Is this just something I have to live with on the trainer?