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calliex

macrumors 6502
Original poster
Aug 16, 2018
489
241
Pittsburgh, Pa
After updating my Ultra II Apple Watch and Phone 15 to ios26 Vo2max dropped from 36 to 32.
It has steadily come up from 34 to 36 until today after a 3 mile run ended up at 32hm
I am 75 and have been working all summer to get to go up.
I am assuming a algoritm change.
Any one have other thoughts
 
You should talk to this guy: https://forums.macrumors.com/threads/change-in-vo2-max-since-upgrading-to-watchos-26.2466427/

Mine also continues to go down, from 54.7 before the update to 51.2 today. As it's still pretty high and I'm winding down a training plan for a half-marathon on Sunday, maybe? It could also be that my new watch is capturing more heart-rate data than my old Ultra was? Or, as you say, Apple has improved the computation with watchOS/iOS 26?
 
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