VO2 Max Watch data source in Health

I have the same issue. I had hard workouts (90% max heart rate) and they were logged before iOS 11.0.3. After iOS 11.0.3, the watch stopped recording vo2 max during my hard workouts. I just went for a hard run for 30 min with 179bpm average heart rate with iOS 11.1and watch os 4.1 and no vo2 max. Apple please fix. Using 7+ and series 2 watch.

thanks for the reply. Since my post, I have had several workouts of longer than 30 minutes, several running and several biking. Only two runs have returned a VO2 measurement and I cannot tell why, they are not the ones with the longest time or the highest heart rate??

Any responses? I have the same issue. We have several watches in the house adn the others read VO2 and the others users are less active so I don't think it's "Activity" related as others are indicating.

I really don't know how is working or rather say how is not working. For me only one time VO2max was calculated 3 months ago. I run 3 times peer week, and usually with hr strap. I do not remember when was calculated I had hr strap with me or no. But I can clearly tell is not depending how intense your run. Because for me was calculated when I run in very slow pace (40 min run after Xmas diner).

So according apple description from health app it should working always outdoor walk/run more than 20 min with pulse data....! doesn't mater if you using hr strap or AW hand reading... yee apple of course...

Same problem here..I have done 5 runnings on ios 11 and watch os 4 (apple watch series 2) and only the first running have calculate the vo2 max...

Same here. Did a 10k today and no V02 Max. Tried a HRM strap on my last run and didn’t even get V02 on that one either.

I am having the exact same problem. Iv done a dozen workouts all of different lengths and workout types and I can get a reading. (I am using the series 3 Apple Watch)

I did get a VO2max reading when I walked 3 and 1/2 Miles. My heart rate isn’t that high. I don’t get a reading when I ride and my heart rate is much higher than when I walk.

I got a VO2 max for an Outdoor walk with m grandson but not for an Outdoor cycle! strange

I have the same problem with Apple Watch series 1???

After the latest watch & phone update, I’m now getting consistent VO2 Max readings. I’m even seeing it when I use Strava for my runs, it’s feeding back nicely into health.