Lactate Threshold HR Test Duration

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    I’ve read that lactate threshold heart rate is from the maximum effort that one can sustain for a full hour. 80/20 has historically recommended taking the last 20 minute average HR of a 30 minute maximum effort run. More recently, the recommendation is taking the last 15 minute average of a 20 minute max effort run.

    I get that a 1 hour test run is rough and is probably more than your average runner is willing to do. But I’m wondering if accuracy is compromised by doing a shorter test. Does the 80/20 calculation formula adjust for the test being shorter? Or do you find that the last 3/4 of a 20-30 minute test gives you results that are close enough to the 1 hour test? Thanks in advance for your response.


    For what its worth, there are just so many variables to testing – temperature, terrain, form, etc. that I cannot control I just do the math. That, and I hate tests…

    I just look at my one-minute maximum heart rate for the last year on Training Peaks and take 90% of that value as my heart rate threshold.,10k%20and%20half%2Dmarathon%20pace.

    Turns out to be close enough the the 80/20 calculators I feel confident in using it for the heart rate zone settings on Training Peaks.

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