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  1. #1
    mtbr member
    Join Date
    Mar 2006

    Confusion about Lactic Threshold Heart Rate

    I'm doing some TrainerRoad workouts. I did the 2 x 8 min Field Tests with an avg HR of 174. At the end of that workout, TR gave me an Virtual FTP # and said my LTHR should be 157 bpm.

    So I jumped on the trainer this a.m. to do an Endurance/Tempo w/o called Mont Gosford and kept my FTP in the suggested range, but my HR was in the low 120's.

    If I recall correctly, a "Tempo" HR for me in the past was in the upper 150's based on an identical HR avg from a Field Test a couple years ago.

    So, is my LTHR actually the 174-175 bpm from my Field Tests? ... because the prescribed FTP range for this a.m.'s "Tempo" workout definitely isn't the perceived effort or HR range I recall in past Tempo workouts.

    Probably could have gotten more of a training effect from shoveling snow this morning.


  2. #2
    mtbr member
    Join Date
    Oct 2013
    The issue with using estimated power is that it is estimated. The HR value falls in the range considered to be the LTHR. At a guess I would simply say that for some reason the estimated numbers are off - temperature variation, tyre/trainer interface, tyre pressure etc. Unless you're using some sort of device that actually measures power then its a wild guess, at best.

    In the meantime, just use the measured HR.

  3. #3
    Has skills-will travel
    Join Date
    Jun 2008
    If you don't believe the numbers, try another test? I do the 20 min test to give me my LTHR and as long as I have really pushed myself, it is general pretty accurate.

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