VO2 Max Watch data source in Health

I've had VO2max readings via the NRC app since Oct/Nov last year and still working well. Only works for outdoor run activities and not indoors. So think maybe GPS data is used in the calculation somewhere.

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...

Finally It works! iPhone 6s updated to 11.1 and aw2 so 4.1 :D

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.

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.

Has anybody tried it with a HRM chest strap connected?

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???