Vo2Max Innacurate

I have the Fenix 7s Pro and the vo7max that is showing is 40 but If I do the test with Polar H10 and Polar Flow, it says 47... something is wrong with this watch. (lastest version of the software)

2655599 said:

something is wrong with this watch

Which of them? Polar or Fenix 7s? Or both of them? Make a test in a lab, only then you'll know.

Even if the vo2max is an estimate, you can quite deduce which one is more accurate just looking at your age and performance. 40 is very low: how old are you, and what's your times on 1km, 5km and 10km?

Cane said:

40 is very low

It depends - and since the screenshot indicates his/her VO₂max is in the middle green field ("Good"), it does not seem to be that low for his/her age.

.. besides that, a number of runs needs to be done, before a more accurate VO₂value is established. Preferably with a HRM chest belt.

Yeah, I was thinking 40 as 'very low' compared to the 47 of the other one, not in general. That's why I was asking for age and some pb times on runs: the discrepancy of 7 points with the polar it's a lot, even if the Garmin is using only the optical sensor vs the H10.

The model used by Garmin to estimate VO2 Max is accurate, even from sub-maximal efforts. The average error is 5% (which is still about 2 points of VO2 Max). Keep in mind, this is the average error. For some people it will be higher, to some people, of course, if will be lower.

That said, there are only a few things you can do on your side to help get an accurate estimate:

- use the running VO2 Max. Garmin gives this model the highest priority, followed by cycling.

- use a chest strap to make sure your HR data is the most accurate. Using the wrist HR is not a showstopper, but the data is more prone to mishaps.

- most importantly, input your HR Max. If you are a trained runner, use your 5K PB peak HR plus 5 bpm to get started, then let the watch confirm/detect your HR Max over a mix a light to very hard workouts, including an FTP test.

I didn´t do the run test, I will try this again

I believe the Polar H10 is better, I have 52 years old

I don´t run, I practice cross training and walking in zone 2