Inaccurate VO2 Max reading on Apple Watch Series 7
MY VO2 max reading on my Apple watch is significantly lower than when I test it on other equipment. Any suggestions as to why this is happening
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VO2 max is at best an estimate-- the watch does the best it can do with what it has-- probably as good as or better than other similar wearable devices. But it, like others, is an estimate-- be careful about taking it too seriously. It's probably best used as a way of seeing if anything has recently changed. (That's anything about your body, not if the change is which watch you used or the algorithm to calculate it!)
Check here:
Track your cardio fitness levels - Apple Support
In part it says
To estimate your cardio fitness level, your Apple Watch also takes into account your:
- Age
- Sex
- Weight
- Height
- Medications that might affect your heart rate
It can take at least 24 hours of wearing your Apple Watch, followed by several workouts* and passive measurements with your Apple Watch before you receive an initial estimate.
So you need to enter that stuff into your profile.