I performed my second Half Monty on the weekend, six months after the first. But… unfortunately for me, my HR monitor was playing up & severely under-recorded my HR during the test - and I didn’t pick this up until I go the message that my LTHR was 121 (it was 162 last time). It started recording properly literally 20 seconds after I finished the ramp test, so when it came to the 20 minute ‘constrained’ section, I tried to remember roughly what my HR was last time & hoped for the best. The result was that my FTP came in 70w down.
My actual performance in the ramp test was better.
Last time I had my FTP set to ~ 235, and I got through 327w & about 35 seconds of 344. After the constrained effort, I got the result that my FTP was 261 (MAP of 316).
This time I got through 351 & quit as soon as it went up to 369, but after the constrained effort, I got the result that my ftp is 195 (MAP of 330).
So…have I stuffed it up & need to repeat the test? Or is there a way to get an FTP estimation based on the above + power curve data?