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Repeat AeT drift test data makes no sense

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    WanderSin
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    Hi guys,

    I followed one of the programs from evoke endurance (12 week) last march to June and as part of it I did a HR drif test.

    The starting HR was 164 bpm, the average of the first 30 minutes was 167 and the average of the second half was 172 leaving the drift in around 3.5%.

    Since then I have been running using nose breathing as I didn’t have any short term goals but since the new season approaches I have decided to do the test again to make sure I am running under my AeT.

    Todays test data made no sense considering the test from 1 month ago and I am not sure if I made something wrong:

    I started the test by warming up until I reached an intensity where nose breathing was becoming annoying, once there I slowed the speed down and wrote the speed number so I could start the treadmill for the test at that speed (timer is 60 minutes and the worm up took 10 minutes or so).

    I started the treadmill again and set the speed to 8.5 km/h and run for about 2 minutes to check if it was an ok speed, stabilize the HR and then I pressed lap in the watch to start the test.

    Finished the test at this speed without changing the speed at all and the data is as follows:

    Starting HR 168

    First 30 minutes average 170

    Second half 30 minutes average 174

    This gives me a drif of 2.3% which is less drift than the test I did 1 year ago while the starting HR was 6 BPM higher.

    Did I do something wrong? Is this normal? I am so confused and I don’t want to mess up my training because of a mistake.

    Best regards,

    Ander.

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