Hi,
I noticed something on my Z1 recovery ride this morning (~32 min, 160 kcal total). The device reports 47 g of CHO used, which seems quite high for this intensity.
Physiologically, for a Z1 ride of this duration, I’d expect roughly 75–80% fat oxidation, so actual CHO usage should be closer to ~10 g.
I just wanted to check if this is a known behavior of the algorithm, or if there’s something I might be overlooking in the interpretation.
Thanks for your insight!
Best, Mika
Yeah unfortunally it takes variability and your estimated VO2max into account. I’ve run in this problem with EVERY commute. High VI calculates high carb utilisation. Even if I do only 40%FTP average, but maybe 50% of FTP as NP - because there are some hills around me… then it calculates 100g carbs within 15minutes commute or so.
I’ve raised this problem somewhere in this thread, but don’t know if the original data modeller / paper author is still reading it on the forum, so I doubt it ever get “fixed”:
So I can’t use this metric if I still track my commutes …