Falsch berechnete VO2max Fenix 7x

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jaikal9 said:

In order for your Garmin to accurately predict v02 max you need to do a running activity outside with gps and give your absolute max effort for at least 10 minutes. Something like a 1.5 to 2 mile sprint depending on your fitness level as long as it leads to you maxing out in 10 min.

This is a little bit misleading.

With Garmin watches you get an excellent accuracy with sub-maximal efforts. This is the whole point of these consumer devices: to give a good VO2 Max estimate even if only walking. This way, both athletes and lightly active individuals get an estimate.

That said:

- the watch will give you a more accurate VO2 Max while running than while cycling than while walking.

support.garmin.com/.../

 - with Garmin watches, you need to input the best estimate of your Max HR to improve accuracy.

- even a formula-based Max HR will give you an accuracy of about 5% on average for an easy run at 70% of HR Max. Your error rate imight be higher or lower.

- you also need to give the best HR data to the watch during all your runs. Use a chest strap or an arm-band that sends good R-R data. Make sure you have a good GPS connection to get accurate pace data during your runs

- jaikal9 is however right when he says that performing maximal efforts across the spectrum (anaerobic, VO2 Max -what he mentions-, threshold, etc.) will improve the estimate: a more rounded data-set for the watch with refine its models, not only VO2 Max, but performance condition, stamina, race predictions, and targets for daily suggested workouts.

This graphs shows how the accuracy of the VO2 Max model increases as the effort gets closer to a true VO2 max effort. The model #3 is the one implemented on the watch. You can see you achieve about 5% of error range at ~60% of VO2 Max or HRR which is about ~70% of Max HR (easy run) and ~1% at threshold and above (~80%-100% VO2 Max or HRR)

Hello jaikal 9, that is all nice, but I go hill up, so the pace is much lower as straight flat ground, I am in the mountains.

Pace 11-20 depending how steep it is, which corrected by Garimin to a pace 6-8 for flat ground, 230W-max 330W over 600-800meters within 3km about 1hour and then my VO2max should only be 27? I expect something about 35-40 which is more for the Pace 6-7 in flat, but it isn't.

Unfortunately, the Garmin models rely on pace a lot. Maybe one day they will use running power instead of pace, or maybe Grade Adjusted Pace.

But today, when I run 400m sprint repeats uphill, I get a much lower Training Effect (which is based on EPOC, which is based on VO2 Max, HR and pace) than when I run the same on flat grounds.

I have tried to neutralize the hills-induced pace bias but using the trail runnign profile and disabling VO2 Max for trail running. I am not sure it helped as I saw an impact on VO2 max on flat runs despite disabling it for those hilly runs. Maybe there were other reasons behing the VO2 Max impact (fatigue, heat, etc.)

I am sure you will get a more accurate VO2 Max estimate if you run on flatish/ondulating grounds or at least not only steep uphills.

I tried to put the data togeter is that somehow rigth?

 so then I am rigth the with uphill is the problem and Garmin will not count it. Thanks.

What do you think about my diagram below? Is it somehow rigth? it is also an estimation as Garmin do all the time :-))

7005240 said:

I go hill up, so the pace is much lower as straight flat ground, I am in the mountains.

Pace 11-20 depending how steep it is, which corrected by Garimin to a pace 6-8 for flat ground, 230W-max 330W over 600-800meters within 3km about 1hour and then my VO2max should only be 27?

In the description of the thread you say that you are not a runner.

7005240 said:

Ich bin kein Läufer

I therefore ask which activity profile you are referring to. Hiking is not recorded and does not provide a VO2max.

Hi Bluefish, nice evening. Trial Run and Running, today I tired Walking(Gehen) is also not better. The only thing is with that I do not get the NO power in W and no corrected Pace up.

Can you describe what data you plotted? Apparently you applied a power based formula to link power to VO2 Max. You need to use caution here as the power-based VO2 Max formulas I know are for cycling power and garmin's power is a different beast. If you were to use Stryd power (which values are closed to cycling power, maybe by design) that could work. For example, WKO5 gives me the same cycling VO2 Max as Garmin, but a much much higher VO2 Max for running because I give it Garmin's running power. When I was using Stryd power, the VO2 Max was aligned with Garmin's estimate (in fact, eeringly equal).