Top zone 2 and aerobic treshold

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  • #20632
    Jeff
    Participant

    I have a question about the zones as set-up by the 80/20 Endurance team:

    Does the top of zone 2 (/bottom of zone X) correspond to the aerobic threshold?
    Or does this zone 2 develop around the aerobic threshold? (95-105% of VT2 for example)?

    #20633
    Gerald
    Participant

    First, let’s start by defining some terms

    VT1 = Ventilatory Threshold 1: The first point at which an athlete’s breathing rate spikes.

    VT2 = Ventilatory Threshold 2: The second point at which an athlete’s breathing rate spike.

    Lactate Threahold: The intensity at which lactate begins to accumulate in the blood.

    Now, both of these require laboratory testing to 100% accurately determine. Luckily, we can determine their functional equivalent (or a close enough value if you will) using field testing.

    VT1 is the breaking point between low and moderate intensity workouts. Anything below VT1 is considered low intensity. Zone 1 and Zone 2 is all low intensity. .

    VT2 is the breaking point between moderate and high intensity workouts. VT2 is the breakpoint of Zone 4. Above VT2 and you are in Zone 4. The upper end of Zone 4 is the maximum pace you can sustain for 6 minutes. It’s closer to what elites would run a 1 mile race.

    The upper level of Zone 3 is considered sustainable for 60 minutes maximum. Lactate Threahold is the breaking point between Zone 3 and Zone Y.

    Coach Gerald
    80/20 Certified Coach
    RunRev Coaching

    #20634
    Jeff
    Participant

    Correction:
    I meant to say: (95-105% of VT1 for example).

    #20635
    Gerald
    Participant

    VT1 is the breaking point between Zone 2 and Zone X.

    In practicality, most people function more around 98%-102% most likely as the point is based on field tests and not the precise lab value. In addition, people improve somewhat as they train and also just have bad days.

    #20636
    Jeff
    Participant

    Thanks for pointing that out Gerald.

    Interesting that you distinguish between the Lactate Threshold and the Ventilatory Threshold 2 and consider that the VT2HR should be slightly higher than the LTHR. But that would be another topic and discussion.

    The reason for my question was the following:

    Actually I got tested in the lab and aerobic threshold (VT1HR) is 139 bpm. My LTHR is 160 bpm.
    When I introduce this LTHR of 160 into the 80/20 calculator Zone Calculator it results in a 144 bpm at the top of zone 2.
    Because my aerobic threshold is 139 bpm, this made me think that the “80/20 zone 2” is a zone that develops around the aerobic threshold instead of developing toward the aerobic threshold.

    #20637
    Gerald
    Participant

    Just to be clear, all of the definitions come straight from 80/20 and their certification courses.

    In your case, you have the benefit of the lab tests I mentioned. The calculator is am estimate based on the generalized average. It’s close enough but will never be 100% as everyone is different.

    If someone uses the estimate of 144 bur also keeps it conversational, they will most likely run closer to 139 most days any way.

    #20638
    Jeff
    Participant

    “Just to be clear, all of the definitions come straight from 80/20 and their certification courses.”

    Thanks for pointing that out and thanks for you help, Gerald!

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