1. What is the best number to use for my current AeT? Or should I repeat the test?
Don’t fixate on a single-digit BPM number. Heart rates aren’t that accurate. It’s safe to say that the low-140s is your aerobic threshold right now. You could use 145 as an upper limit.
2. If my AeT is now in the 140’s, is it typical to see this much increase in AeT after 6 weeks?
Yes, but it depends on many factors:
1. Response from the individual;
2. Total sub-AeT training volume;
3. Amount of HIIT training (the less the better when repairing the aerobic system);
4. Fasted training (some may help);
5. Whether training by pace (preferred) or heart rate (more convenient).
And if the answer is yes, I assume I would not expect increases in my AeT like this again as I will plateau.
We don’t have enough information to say. It depends on how bad your ADS is. Search the site for our DIY anaerobic threshold test. When you know the gap between your AnT and AeT, then you’ll know how much you can expect.
It’s reasonable to expect to close the gap within 10%. Depending on the individual and training, 5% is not uncommon among highly trained athletes.