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VO2 Max results after my Garmin froze last week

Posted on 2/7/25 at 7:28 am
Posted by tigernurse
Member since Dec 2005
34984 posts
Posted on 2/7/25 at 7:28 am
My garmin was one of the models that experienced the Blue Triangle of Death crash last week and after a reset, my vo2 max went from 41 to 38.

Not a significant difference but still... I've scoured the internet on how to improve it and not finding any articles with much useful information so I thought I'd check with y'all.

any suggestions for improving my result? I am actually far better conditioned than I was last year so I am sort of confused as to why my result decreased after I had to do a hard reset on my watch.

I will say that the first run after the reset absolutely sucked - so that might be it, but I have had multiple GREAT runs since then and no change.

I am considering just doing another hard reset - that's the only thing I have not tried but I am sort of worried that it would decrease even further.
Posted by Mingo Was His NameO
Brooklyn
Member since Mar 2016
30701 posts
Posted on 2/7/25 at 9:20 am to
1. When you reset it did it update the software as well? It could be using a different algorithm, giving you a different result

2. You have way less data for the algorithm to analyze. It should adjust as you input more runs
Posted by Salmon
I helped draft the email
Member since Feb 2008
85118 posts
Posted on 2/7/25 at 10:15 am to
It most likely lost all of your old data and is starting over, as you said, a "reset".

I also wouldn't worry too much about your Garmin VO2 max score, as it is likely widely inaccurate.
Posted by Not Cooper
Member since Jun 2015
4946 posts
Posted on 2/7/25 at 11:16 am to
Had a similar issue with Apple Watch VO2. No matter how many runs I input and how much faster and more endurance I have my VO2 score continually goes down.

I’m guessing it’s a bug in the way they do the calculation. I know how frustrating it is because I know I’m in much better cardiovascular shape than I was 3 months ago, but my watch says I’m doing worse lol.
Posted by Burt Reynolds
Winnfield, LA
Member since Jul 2008
22920 posts
Posted on 2/7/25 at 11:24 am to
I own a garmin and find the VO2 max stuff to be bullshite.
Posted by tigernurse
Member since Dec 2005
34984 posts
Posted on 2/8/25 at 6:58 am to
quote:

1. When you reset it did it update the software as well? It could be using a different algorithm, giving you a different result


No. It was a garmin glitch.
quote:



2. You have way less data for the algorithm to analyze. It should adjust as you input more runs


Thanks.

Appreciate the feedback from all y’all.

Happy running today y’all. About to head out for a long run.

It’s a chilly 55° here this am here so should make for a good run.

Posted by SoFlaGuy
Fort Lauderdale
Member since Apr 2020
1930 posts
Posted on 2/8/25 at 11:26 am to
Did a 5 miler this morning, got out later than I wanted and the sun was already burning. Humidity was brutal too. First humid hot run in a while, VO2 went straight down. I used to obsess over it, but I know if I do track work tomorrow, it will go back up.

Garmin loves harder paces with lower HR. It doesn’t account for illness, humidity, etc.

Ive finally come around not to obsess and just be consistent. My wife is much happier lol.
Posted by G Vice
Lafayette, LA
Member since Dec 2006
13111 posts
Posted on 2/8/25 at 2:10 pm to
How accurate are these Garmin devices for measuring VO2 max?

Would maybe borrow one for a one-time assessment vs scheduling an actual max stress test.
Posted by tigernurse
Member since Dec 2005
34984 posts
Posted on 2/8/25 at 3:23 pm to
quote:

Garmin loves harder paces with lower HR. It doesn’t account for illness, humidity, etc.


That makes sense because today was a 7 mile, uphill and against the wind run - so it was a lot more challenging but I made sure to keep my heart rate in the 160’s. After the run- my V02 went up from 38 to 39.
Posted by Ingeniero
Baton Rouge
Member since Dec 2013
20313 posts
Posted on 2/8/25 at 3:31 pm to
I don't think it'll read from a one time test. If it remember correctly you have to wear it for a few outdoor runs to get a score, and even then it's not accurate compared to a lab test. It's nice number to look at but it doesn't really mean anything
Posted by tigernurse
Member since Dec 2005
34984 posts
Posted on 2/8/25 at 3:58 pm to
I’m not sure how accurate they are- but it hurt my feelings when mine decreased by 3 points when I felt stronger and better conditioned from the first reading when I got this watch a year ago.
Posted by BobABooey
Parts Unknown
Member since Oct 2004
15489 posts
Posted on 2/8/25 at 8:18 pm to
I have no idea what that VO2 measurement means. My watch says it’s 45 and my Fitness Age is less than 1/3 of my actual age. I just can’t take it seriously.

I got the watch in December so maybe it doesn’t have enough data?
Posted by BaddestAndvari
That Overweight Racist State
Member since Mar 2011
18580 posts
Posted on 2/8/25 at 8:39 pm to
quote:

I’m not sure how accurate they are- but it hurt my feelings when mine decreased by 3 points when I felt stronger and better conditioned from the first reading when I got this watch a year ago.


It's just an estimate - I ran a 100 miler last year and my vo2 Max estimate went down 2 points after. It's a great tool to just keep an eye on, but it's just an estimate, it's not a lab tested number and for some people it's really close to the real thing and for others it's not.
Posted by tigernurse
Member since Dec 2005
34984 posts
Posted on 2/8/25 at 9:22 pm to
It’s a representation of how well your body uses oxygen and in some degree represents your level of fitness. Or at least that’s my best understanding of it.

I’m 51 and am in very good shape so I tend to pay more attn to it than I should probably. But I don’t want to get old and out of shape while I’m still able to maintain a high level of physical fitness.

I guess for me it keeps me accountable to myself for pushing through runs when I’d rather shave off distance or intensity.
Posted by G Vice
Lafayette, LA
Member since Dec 2006
13111 posts
Posted on 2/8/25 at 9:29 pm to
VO2 max is the volume of oxygen your body can consume at the level of working tissues per kg of body weight per minute. This is not to be confused with the amount of air your lungs can inhale.

The more oxygen your body can use, the more in-shape you are, the more tuned up your enzyme and energy producing systems are.
Posted by Yeti_Chaser
Member since Nov 2017
9907 posts
Posted on 2/9/25 at 10:10 am to
Mine seems to at least trend correctly. I quit doing cardio and ate and drank like shite over the holidays and it decreased a good bit. Started to climb back up somewhat when I got back to my regular habits. Haven't started incorporating cardio again though but I'm about to so we'll see what it does
Posted by Ace Midnight
Between sanity and madness
Member since Dec 2006
92602 posts
Posted on 2/9/25 at 10:55 am to
I'm going to be "that guy" - if you're not connected to all the appropriate equipment, it is just an extrapolation of data based on algorithms, assumptions that may or may not be valid, etc.

My best advice, if you are critically concerned, is to find a sports medicine clinic that can do a "real one". Compare it to your results on your personal devices, and then periodically (6 mos, a year, etc.) update with a "real one". At least until you have confidence in your equipment to get a real estimate.

Otherwise, if you are doing more, workout-to-workout, having more endurance and other (more reliable) readings on your personal device are showing improvement, ignore an obviously false result on VO2 Max.

That's my big red flag with equipment. If I can't trust it for the intended purpose, I move on. Bad data is in many ways worse than no data.
Posted by BobABooey
Parts Unknown
Member since Oct 2004
15489 posts
Posted on 2/9/25 at 11:14 am to
quote:

It’s a representation of how well your body uses oxygen and in some degree represents your level of fitness.

Also thanks to GVice for a great explanation.

I will start paying attention to the score. I just started participating in 5k/10k’s and I had no idea there was more to training than “go run the distance you’re training for a bunch of times.” My Garmin is giving me lots of info to sift through.
Posted by tigernurse
Member since Dec 2005
34984 posts
Posted on 2/10/25 at 7:33 am to
quote:

I'm going to be "that guy"


I actually appreciate that from you and the others who have poised that perspective.

quote:

My best advice, if you are critically concerned, is to find a sports medicine clinic that can do a "real one". Compare it to your results on your personal devices, and then periodically (6 mos, a year, etc.) update with a "real one". At least until you have confidence in your equipment to get a real estimate.


I am a big evidence based practice nerd, so I think I may look into doing that.

quote:

That's my big red flag with equipment. If I can't trust it for the intended purpose, I move on. Bad data is in many ways worse than no data.


very good point.

thanks all.
Posted by DeoreDX
Member since Oct 2010
4154 posts
Posted on 2/11/25 at 8:14 am to
It's very possible to have improved your aerobic base and not improve or even lose VO2Max. To improve VO2Max you have to do really high intensity work. I spent most of last year improving my aerobic base while not doing much if any high intensity workouts and improved my FTP but didn't improve my VO2Max. As I build up into the race season I've done a lot of high intensity intervals and I've seen my VO2 max as estimated by Garmin and Intervals.icu jump from around 43 to 46-47. in 6 weeks of work.
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