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larkim
larkim
Jan 2021
2:04pm, 13 Jan 2021
13,218 posts
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larkim
I appreciate that as the years pass by the VO2Max would decrease, but last year's PB for you would be a VDot of 32-34 so a VO2Max in that sort of ballpark. So maybe the calc are closer than you think? Vdot as a training guide for you at the moment could well be lower than that if you're not in the same shape as last year.
SPR
SPR
Jan 2021
2:10pm, 13 Jan 2021
32,934 posts
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SPR
Garmin method in third link here.

firstbeat.com
Dvorak
Dvorak
Jan 2021
2:38pm, 13 Jan 2021
21,740 posts
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Dvorak
The run I used fot the VDot was my last fakeparkrun which was done as a progressive run, so perhaps not entirely representative. Taking the fastest 3K and 1K though, I actually get a worse VDot, but the Fetch number is pretty stable.

Taking my fastest 5K of 2020, which was 4th January and yes, I was in better shape off a bit of better running, that was 28.42 and gives me a VDot still of only 29.5. I have to use an estimated ahr for the Fetch number, but that is around 47.
larkim
larkim
Jan 2021
2:54pm, 13 Jan 2021
13,220 posts
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larkim
I'm re-reading that now as its been a few years since I went through that, and my understanding is a bit better now.

It's a shame the absolute calculation is published, even if they protected their method for distinguishing between "useable" and "unuseable" HR / speed data from a specific run.

Worth noting that they say that their calcs were I think +/-3.5 from lab measured results, and that theirs is flawed in the sense that it uses a generic maxHR formula too. Does it's implementation on Garmin watches use a fixed maxHR based on age, or does it take the user-entered figure from the Garmin profile?
Dvorak
Dvorak
Jan 2021
3:29pm, 13 Jan 2021
21,741 posts
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Dvorak
*correction* VDot from last years fastest run was 32.5 (the calculator had somehow decided before that 5K = 4.6 km) runsmartproject.com
SPR
SPR
Jan 2021
3:39pm, 13 Jan 2021
32,935 posts
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SPR
Larkim - thought it only used a generic max where a real max wasn't available. I'm sure someone here 'fudged' their max to get a VO2 Max that gave them better calcs previously.
CogNoscensme AHA
CogNoscensme AHA
Jan 2021
7:03pm, 13 Jan 2021
691 posts
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CogNoscensme AHA
My best Garmin VO2 max was 54 (Fenix5) and that produced optimistic race times. I could never break 20 minutes when Parkruns still existed. It fell to 49 in October and has never recovered. I was hoping that Garmin had rejigged their algorithm but I think its an actual drop in performance. And probably still optimistic if I had a race to test it on.
larkim
larkim
Jan 2021
7:11pm, 13 Jan 2021
13,223 posts
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larkim
You may be right SPR, the firstbeat paper would allow for both I suppose.

RunAlyze allows for a fixed adjustment factor in their VO2Max calcs, so I suppose if you have a consistent error you can back-adjust it if necessary.
larkim
larkim
Jan 2021
11:12am, 14 Jan 2021
13,228 posts
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larkim
On the RA site, the drop down for "Show VO2Max Calculation" appears to show that they calculate it per run on the following basis:-
MaxHR achieved in that run compared to actual MaxHR (as a %age) which is predictive of the vV02Max %age (i.e. the percentage of the veolicity at V02Max for that runner), which is then converted into a VO2Max calc. This is then scaled back using a conversion factor of 0.91 which is user customisable.

I think this is saying that if you can say what the 100% vVO2Max is then you can derive an estimated VO2Max, but I don't know how you go between those two values; just knowing the vV02Max is not enough, you also need to know how long a VO2Max effort can last (I suspect there is some guidance on this somewhere!).
SPR
SPR
Jan 2021
12:00pm, 14 Jan 2021
32,941 posts
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SPR
I'm not sure you're reading that right. Runalyze calculate your average HR in the run as a %age of your max HR. There are then formulas that equate %age of HR max to %age VO2 max. The adjustment factor can be used if you don't fall in line with the normal factor hence the use of race results to adjust, so if you run 10km races at 85% max HR instead of say 90% as expected (made up numbers).

It's pretty simple way of doing it really.

About This Thread

Maintained by Elderberry
Everything you need to know about training with a heart rate monitor. Remember the motto "I can maintain a fast pace over the race distance because I am an Endurance God". Mind the trap door....

Gobi lurks here, but for his advice you must first speak his name. Ask and you shall receive.

A quote:

"The area between the top of the aerobic threshold and anaerobic threshold is somewhat of a no mans land of fitness. It is a mix of aerobic and anaerobic states. For the amount of effort the athlete puts forth, not a whole lot of fitness is produced. It does not train the aerobic or anaerobic energy system to a high degree. This area does have its place in training; it is just not in base season. Unfortunately this area is where I find a lot of athletes spending the majority of their seasons, which retards aerobic development. The athletes heart rate shoots up to this zone with little power or speed being produced when it gets there." Matt Russ, US International Coach
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