To clarify, have you done two aerobic threshold tests In the last two weeks? Our HR’s change day to day, but a ten beat difference is quite a lot. How recovered were you for both of these tests? Did you do a longer warm-up on one? I always err on the side of caution and would say use the 136 bpm as AeT if your drift was already at 4.6%. If 136 feels easy, sustainable, and like you can recover day after day even within 12hrs, I would suggest you train at or below that heart rate. Carolyn might have more comments, but that is where I would start.
I hope that helps!
I initially completed the aerobic threshold test on 1/10 and my result was 136 (The drift was around 4.6%). I got a chest strap HRM and decided to do it again today.
Today’s pace was increased slightly (0.3mph) from the 1/10 test and I was working harder too. I was still able to speak in full sentences (though not several in a row). My threshold result was 146 and drift was 4.6%.
I noticed that my first few aerobic workouts in zone 2 (after the 1/10 test) felt fairly easy, if that indicates anything.
Which result should I use?
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