Interpretation of Lab AeT & AnT Data

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  • #81932

    Earlier this year, I had the chance to participate in a study that required a lactate step test on a treadmill. In the report (attached) my AeT and AnT were reported as 143 and 165, respectively. My resting lactate level was 0.7 mMol/L.

    I’m confused by two things:
    1. In Training for the Uphill Athlete, it’s stated that the AeT is reached when the lactate level reaches or exceeds 2mMol/L (which didn’t occur until ~160bpm) or the first stage where the lactate number increases by 1 mMol/L (if they mean 1 mMol/L higher than the resting level, then this was at 151bpm). Any thoughts on how they landed on 143 for the AeT?

    2. In the ‘Current Training Zones’ section, they listed the HR ranges as follows:
    Zone 1: <130
    Zone 2: 130-140
    Zone 3: 160-170
    Zone 4: 170-180
    Zone 5: 180<
    Is there a reason they’d leave the range of 140-160 out? Seems like a pretty wide zone to ignore. And why wouldn’t the AeT and AnT values define the upper bounds of Z2 and Z3?

    Based on the attached data, do any coaches or experienced athletes have suggestions for how they’d define my training zones in the context of TFTUA?

    Summary of data:
    HR / Lactate (mMol/L)
    112 / 0.8
    118 / 0.7
    127 / 1
    132 / 1.1
    143 / 1.3
    151 / 1.7
    162 / 2.1
    173 / 2.5
    181 / 4.1

    Thanks for your help!

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