
Started running outside after 1.5 years of treadmill-only running , now my VO₂ max increases every run. Calibration effect?
After about 1.5 years of treadmill-only running, I recently started doing more outdoor runs, and now my Apple Watch VO₂ max increases almost every run 😅
On the treadmill it doesn't calculate VO₂ max, but since going outside it went from 43.5 (walks) to 48.8 in a bit over two weeks.
I’m guessing the watch is finally calibrating properly with outdoor GPS pace data, since my training itself hasn’t changed much (mostly easy/Z2 running, 4–6x/week).
Has anyone else experienced this after switching to outdoor running? How long did the calibration effect last before things stabilized?