And here is another one for the list, in fact it goes hand in hand with my field testing comment.
A week ago I did 2.5 hours total with 130 minutes at .71 IF and roughly 10 minutes warmup & cooldown:
and this is what Garmin said:
Garmin estimates that by running machine learning (ML) algorithms on HRV, HR, and power-to-HR. And doing some calculations related to EPOC and VO2max.
And zones (per @redlude97 request after I originally posted):
Another recent one at .75 IF
Take out the outliers and traffic stops, its around .74 IF for an hour:
A bit of glycolytic/anaerobic stimulus on that one because at the beginning I didn’t do a good job controlling power thru an intersection, and then a little extracurricular above threshold fun around 30 minutes and again near the end of the 100 minutes.
This is Garmin’s view:
and zones:
In general those Garmin 530 training benefit summaries have been pretty darn accurate.
And FWIW, Xert has my lower threshold power at 191W which translates to .7 IF.