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Peformance Condition 20 but VO2 max going down

Former Member
Former Member over 4 years ago

I've just been for a run this morning and was a bit surprised on my return to look at the performance condition and see it varied between -10 and +20. Most of the time it was positive and during a 45 minute run it was between 10 and 20 for about 28 minutes of the run.

Despite the above my VO2 max went down by 1 following the run. Prior to setting off it was 48 but after the run it had gone down to 47.

Not disputing the VO2 max but can't see how my performance condition was so high but resulted in my vo2 max going down.

Can anyone explain?

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  • 0 over 4 years ago

    www8.garmin.com/.../GUID-901ACCFC-FB0D-414E-B80C-54970AF4E357.html

    They are two different values. All these values are rough estimations for running, because the watch does not know if you ran with your lightest shoes on a perfect road or with heavy shoes in mud, rough ground, snow etc.

    If you really want to investigate your shape, do a test run on a track or a known distance (or even a competition - when it's again possible).

  • Former Member
    0 Former Member over 4 years ago in reply to RunR

    Thanks for the reply and the link.

    However having read the linked document it now makes even less sense.

    In the link it states that PC is a percentage deviation from baseline vo2 max. So when my PC for the run averages about 12 for the 45 minutes it doesn't make sense that vo2max can drop after the run. 

    At the start of the run vo2max was 48. For the majority of the run I was performing 12 percentage points higher than my baseline vo2max (so about 53 vo2 max). Well it doesn't make sense then that vo2max drops to 47 immediately following the run.

    I realise both figures are estimates or approximations but they should be estimated using the same data and so should move in the same direction if they move.

    Maybe I'm missing something. 

  • 0 over 4 years ago in reply to Former Member

    when you started your run, do your PC start -10?  I have found for myself that when I am cycling, because I live in a “bowl”, in order to get to my preferred cycling routes I need to climb roughly 100-120m of rolling elevation to get out.  This normally causes my PC to start off in the negatives because the rolling, short climbs causes me spikes in HR, and then lower power going down the other side of the hill with a higher HR.  Even when I bring the PC up to a positive value after I am out of the bowl, with only maybe 5mins in the negative and 3 hours in the positive my VO2 can still go down.  It is so a dumb algorithm.  I honestly stopped caring about these values and just ride to feel Slight smile

  • Former Member
    0 Former Member over 4 years ago in reply to ic3cold

    Hi ic3,

    No PC figures for the first 10 minutes of the run then it starts at -12 then tapers up to 0 by about 15 minutes. It then rapidly rises to +20 where it stays for about 3 minutes and then steadily drops over the remaining 25 minutes until the end of the run where it is still reading +12.

    Overall the average PC must be about +14 but VO2 max goes down!

    I have a fairly flat start to my run then a 6% downhill at about 6 minutes for 2 minutes. After that it's relatively flat.

    You're right, the algorithm seems quite flawed.

    From now on I will try to pay less attention to PC and VO2 figures.