Good question, I don’t know.
I’m under the impression LTHR (at least) doesn’t change much*. My N=1 and what I saw from other riders lactate numbers (from a former coach) led me to believe it does not. But I suppose there could be situations where it might? Not sure.
* much = if I go from 161bpm to 163bpm I don’t care (for example)…but maybe I should. Some ppl are discussing the change as if they’ve gone from 130bpm to 150bpm AeT HR. Something is off with way that is being communicated to me.
Also assuming you are thinking “inflection point” definition of LT1 and not some fixed value (in which case it very much might change).