I did an AnT test this weekend and got some unexpected results. The attachment shows my HR and pace graph. My pace was relatively constant averaging 7:30/mi but my HR climbed for most of the test. In the picture, the red box is about where I would expect my AnT HR to be, that part averages 174, but the green box shows my HR climbing for the remainder of the test, peaking at 194. I did the test at a track near my house so completely flat surface.

For some reference, probably 10 years ago I did a max HR test and got 208 so 194 is not a surprising number to see if I was doing a max HR test but it is surprising during an AnT test.
In previous tests my AnT has consistently been 175-180 and the graph usually gets to about that level and more or less flattens out (some variation but usually around that level).

If I take this test as accurate then my AnT would be 185, but that is higher than it’s ever been after months of not going above AeT during training.

My only thought is that maybe I wasn’t recovered enough before the test? But I didn’t think I needed to be fully recovered for an AnT test.

Any thoughts or ideas?

Thanks,
Paul