Hey Jane, thanks for the response,
I had another look at the analysis of the fun run, and essentially the back 75-80% I had a negative Pa:HR. I found this means downhill running, which makes a lot of sense and a reason I shouldn’t look to that for an accurate result.
I’ll take your advice and wait a few days to do the test again.
A parting question, if my Pa:HR was 1% at 140bpm, is it worth bumping up to 150, or is it always recommended to bump up 5 each test.
Thanks again for the response!