flav09, you’re right that the results from the wrist monitor are not going to be accurate. The other possible factor is the nature of the terrain. The HR drift test must be done on essentially level ground or very gently rolling terrain — as with any test, controlled conditions are necessary to get an accurate result.

One tip: it’s best to wait 2-3 days between tests because it’s fatiguing enough that you’re unlikely to get accurate results if you repeat it sooner than that. You want to be fairly fresh when you do it.

Jane

Downhill’s definitely not going to give you an accurate result 😉

If it were me, I would bump to 145 for the re-test. Then if you get close enough, you can estimate the AeT: e.g. 2% drift at 145 — you could take 147 as your AeT. This isn’t an exact science and our physiology changes from day to day; the main purpose of the AeT is to make sure we’re not training too hard when we don’t want that intensity.