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How does the F245 calculate V02 max based on temperature?

Former Member over 5 years ago

I've read that this watch uses local weather data from your phone to get the temperature and then adjusts V02max accordingly during your run any time the temperature is at 72F or above. I also read this is done behind the scenes, meaning we have no data to see exactly how it's doing this. This is fine with me and nice to know if it's compensating for the temperature but I don't run with my phone. When I sync with Garmin connect however at the end of my run, I always see a temperature tagged to the run, which I know is coming from my phone during the synching process. So is this still a valid calculation? I will likely be running above 72F for the next 4 months.

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0 didney over 5 years ago

The temperature is not taken into account in the VO2max calculations. Your numbers might go down in hotter weather.

0 KyleKeegan over 5 years ago in reply to didney

Certain watches do account for heat and elevation. See link below. The 245 is one of watches that does.

https://support.garmin.com/en-US/?faq=PQCtbgWxJ65nRatXoHCmy7

0 didney over 5 years ago in reply to KyleKeegan

Certain watches do, true. But as your link states these watches are the Fenix 6 Series, Forerunner 945, MARQ series, and tactix Delta.

245 is not supported.

0 KyleKeegan over 5 years ago in reply to didney

I stand corrected, but it is rather confusing because in the 245 manual it specifically states that the Vo2Max is adjusted due to heat and elevation.

0 Former Member over 5 years ago

Thanks for the replies, I have seen the Garmin page about the supported watches. I was reading a comprehensive 3rd party review here: www.dcrainmaker.com/.../garmin-forerunner-245-music-gps-watch-in-depth-review.html that states the temperature compensation is supported but I guess it's not so.

0 Roedema over 5 years ago

HermanB Can you clarify? The support FAQ linked above omits the 245 from the list of compatible devices with heat-adjusted and altitude-adjusted VO2max, while the owner's manual says: "Your device adjusts the VO2 max. values for heat and altitude, such as when you are acclimating to high heat environments or high altitude."

See also the OP's question about how it works. Thanks.

EDIT: Actually, I see from another thread that the 245 does indeed account for heat in the VO2max estimation, according to HermanB of FirstBeat.

0 Former Member over 5 years ago in reply to Roedema

Thanks for this info, looks like First Beat is the best source on these types of metrics they offer. I'm not sure if they have a message support forum or not though.

It will be nice to see now if my V02max does not decrease over the long hot summer!

0 PALIREK over 5 years ago

I used to have the same VO2max with last summer with 245 like now with 945, I was also running with them paralel also in hotter conditions without seeing any difference. Therefore thinking it's calculated based on the same manner. But good if somebody confirm this officially. Where is the difference, 945 can measure "heat acclimatization" in addition but this is known.