Apple watch VO2 max measurement dropping like a rock

How long have you been using the watch? Could the sensor be broken?

And you should also try restarting your watch. If all the above tips don’t work, try doing a factory reset. You can find it in your watch’s settings by going to Settings > General > Reset.

You may have to scroll down all the way in your General Settings.

Yes, me. It’s getting worse every day which is depressing. I’ve read elsewhere it isn’t actually Vo2max but a basic calculation - I don’t really understand that but the fitter I get the worse it gets.

me too, it’s so frustrating. To be clear in the last year I’ve went from long covid collapsed lung to losing a ton of weight, running 5ks, and lifting weights/running/cycling 7 days a week. My cardio recovery continues to climb March 10-16 I was 39.5 on vo2 max. I’m 51 years old. I was sooo close to hitting 40 vo2max and then it just bottomed out! In a month I’ve now dropped to 34, regardless of doing 800m sprints, tracking miles outdoors via strava on walks and runs. Nothing is bringing it back up. It keep declining. So much for positive reinforcement and seeing any kind of accomplishment for the hard work 🫤

I'm having a similar issue with the series 9. I started working in landscaping a month ago (so waking like 10 miles a day, etc), climbing 40 flights one day a week and have lost like 10lbs. I walk the dog twice a day in our hood, same path. My vo2 shot up and is now dropping like a rock. This morning I'm to an all time low of 33.1! I've done the reset and all. It's discouraging for sure.

Same , 8 miles a day, same routes ,

mix of treadmill and on the road, 5 years of steady 42’s (I’m 60). After since March dropping all the way down to 38. Something in the algorithm changed Ultra 2 watch