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Feb 2022
2:20am, 15 Feb 2022
2,317 posts
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jelly (limegreenjelly)
I am not in denial flanker, I know exactly what state I’m in.
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Feb 2022
8:33am, 15 Feb 2022
1,308 posts
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Steve NordRunner
I think Garmin tries to make a valiant attempt to say qualitatively what state of training one is in, but it doesn't have all the information it needs. In my own case I have been apparently peaking due to routing and conditions underfoot that the watch doesn't know about.
Up until last week I did varied runs for Fetchpoint. Sometimes this needed short trail sections, shortcuts, etc., within the overall «run» type. Also, there were patches of ice, snow, etc. where I had to tread carefully. Then, in contrast, on holiday I had simpler runs on a more consistent surface with fewer pauses. My apparent VO2max rose a couple of points in a week or so, whilst distance covered dropped by 10 or 20%. So I understand why the rating changed but I believe it was due to external factors rather than that I am actually peaking.
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Feb 2022
8:46am, 15 Feb 2022
1,505 posts
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Big_G
After one day, it seems I am no longer peaking :D A fairly challenging run in the wind, today.
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Feb 2022
8:48am, 15 Feb 2022
1,003 posts
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Bowman 🇸🇪
You can hack the measurement when you learn how it calculates too.
I kinda noticed that the device wants a “+run” or “-run” before it actually raises or lowers the number, so if you do a slow low effort and next run a fast effort over and over again it kind of stucks at the same number even though you are actually every other run have + on your vo2max. Also.
Easiest way to raise VO2max is with 10-15 min runs slightly down hill with at least 10 min over 70% of your MHR. (and a slightly higher MHR than you have, also helps)
Its just a calculation, not a real measurement. But a fun one 
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Feb 2022
9:16am, 15 Feb 2022
1,506 posts
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Big_G
I know what I am about to say isn't about Garmin, but my Stryd footpad has a stab at capturing air power, and how it may impact a run. Today's run was 7-miles with 2 miles (mile 5 and 6) at MP, in the wind.
The first pic shows the 5th and 6th miles and you see my power and the air power, although admittedly this may not look that spectacular at 2% air power.
The second is zoomed in further (approx 36mins - 37:30 of the run), again showing my power and the air power, but with the screenshot also showing the map of that section that I have zoomed in on. On the graph you can see how it is trying to show the wind, and on the map that corresponds exactly to where there is basically a strong head wind through what is effectively a wind tunnel, and is exactly where the wind is worst on that lap (it is showing 9% there). It explains why I was struggling on those sections, anyway!
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Feb 2022
9:18am, 15 Feb 2022
36,279 posts
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SPR
Bowman - I'm not sure how good the calcs are but it is supposed to account for downhills and it's not the watches fault that people put an incorrect max in. I agree short runs will give you the best calc though, VO2 max is supposed to be around a 10 min max effort so that makes sense.
There was a time I could do easy most of the week (so no measurement) and it would still change when I did my one progressive run and sometimes on long runs. It seems it needs less than 10 mins above 10 mins these days so more runs calculate a VO2 max than previously (I've had it calculate in a 1500). It seems 4 mins does it now so easy with a faster finish can lead to a calc.
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Feb 2022
11:46am, 15 Feb 2022
1,004 posts
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Bowman 🇸🇪
SPR, yes im not complaining at all, just trying to share my findings to people who might not really know how it "works".
MHR, of course not the watch´s wrong doing
And about the hills, it should have that in the calculations according to Garmin, but slightly down hill seems to benefit the vo2max still.
It surly does give good reading from long runs and what not as well sometimes for me too.
The 10 min at at least 70% is just what i have read on garmin.com about their vo2max explanation.
I do like it, and i like to know how it behaves and calculates and so on.
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Feb 2022
12:04pm, 15 Feb 2022
36,282 posts
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SPR
Bowman - The 10 mins is indeed what's in Garmin's literature. It definitely used to do that but I investigated after I started seeing VO2 Max numbers in more runs and found it doesn't need 10 mins anymore. 1500m and 3000m races were dead giveaways given they last less than 10 mins.
Runalyze shows the small changes the watch doesn't tell you about so I was able to see a clear trail to analyse.
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Feb 2022
12:05pm, 15 Feb 2022
17,029 posts
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larkim
I keep a close eye on the VO2Max reading to two decimal places (via Runalyze) and I'm pretty happy that, however it does it, the output does tend to bear a pretty striking relationship with how I've felt during a run (either increasing, decreasing or static VO2Max reading). Though wind has definitely had a negative impact recently!
I am tempted by a Stryd as that does seem to give a pretty sound replication of the otherwise unmeasurable additional efforts of things like wind and rain.
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Feb 2022
12:20pm, 15 Feb 2022
946 posts
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AndyS
Easiest way to raise VO2max is with 10-15 min runs slightly down hill with at least 10 min over 70% of your MHR.
I think we have very different ideas about the meaning of the word "easiest" 🤣
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