Steve…
Yes.
AeT at top of Z2 (i.e. the Z2-Z3 border)
AnT (aka LT) the top of Z3 ( the Z3-Z4 border)
Z4 is the range from AnT to HRmax. Typically only seen in (training) efforts ranging from 30sec to about 8min in duration
Z5 by contrast is HRmax effort that can only be performed in the sub 60sec duration.
As far as testing goes…
(And it depends upon how accurate you want the results)
Doctor… most likely not… unless it’s a cardiologist doing a stress test, and they will likely want a good reason to do so…
University Kinesiology Department….. yes. Especially if they have gas exchange apparatus.
Performance Testing Centres (like what
@Don Fairbanks just posted)
Some personal coaches who specialize in running and cycling often do Blood Lactate testing for AeT, and also offer AnT testing. I have a guy…
DIY AnT testing is relatively straightforward and accurate.
HR max can be done in a DIY fashion, but like the Stress Test… I would prefer to have somebody standing by with the paddles…
Something I did not know until a few years ago is that VO2max testing may or may not give you good results for AeT and AnT, depending upon how they administer the tests. But then again, I am not a big fan of VO2max being that meaningful of a metric anyway.
I probably slightly disagree with
@JPCross about AnT in well trained endurance athletes being closer to the top of Z4. I would rather say that in these athletes Z4 starts at a higher HR than in lesser trained individuals. Their Z2 is also at a higher rate, and that they have a compressed Z3. Additionally they can stay in Z3 and Z4 for a longer time.