Do you know how the lab Vo2Max compares to Garmin’s estimate?
I can give you an example if you want (n=1 and all that)…copy and paste from another thread with some updated numbers…
I have only ever done 1 proper Vo2Max test using gas exchange which was back in 2017 which gave me a baseline reading of - 64ml/kg/min - FWIW I was 71kg which put me at 3.1w/kg it seems looking back at my notes. In 2017 I was riding, but not training properly but getting in the miles ahead of a brig trip.
If we skip forwards to now, my Garmin gives me a Vo2Max of 78 and intervals.icu gives me a Vo2Max of 70.6 (based on last 90days training) - read into those calcs/ algorithms as you will. I am now circa 64kg and at 5.1w/kg. I would like to do another proper Vo2Max test at some point.
As another cross reference, using the MHR/RHR*15 formula posted above this works out at a Vo2Max of 70…
Interesting and I think confirms what I expected Garmin is a complete overestimate.
My best Garmin VO2max was 76 IIRC and relative to that my current VO2 max prediction of 62 is probably accurate but there’s no way I am in the top 1% for my age.
I never realised Intervals.icu calculated it, the intervals.icu forum in Mar 22 said it wasn’t implemented. Where do I find the intervals.icu estimate? I’m sure itll be more realistic than GC.
Edit found it intervals estimates that its 56 at the moment based on my best 5min power based on my best last year it was 61.
If I take my Garmin RHR for the last week and use that formula I get 59-62 which I still feel is too high.
Edit 2: So garmin although slightly too high isn’t as far off as I thought 
Where do you find it in intervals.icu? I’ve never seen it.
On your Power page, under Best Efforts on RHS…
Referenced formula used: Five-Minute Power-Based Test to Predict Maximal Oxygen Consumption in Road Cycling in: International Journal of Sports Physiology and Performance Volume 17 Issue 1 (2021)
Found it! Thanks! 58.9 according to them. 58.8 according to Zwift. 63 according to Garmin. It also says my current 42 days is the highest even though Garmin said I peaked at 70 last season.
Do you have the absolute levels as well?. It will be interesting to see the improvement from training independent of weight loss.
Age ; 24
Resting ; 45bpm
Max ; 215bpm
Range ; 170 
I’m afraid not. Agreed it would be interesting. I would really like to do a lab test again now I am “well trained”
Age 30:
Resting: ~62-64
Max: 190
Range: 126
I noticed my HR jumps to 130 the second I start pedaling. My Z2 avg HR is around 130-134. I barely reach my max HR ever. It sits around 140-150 doing threshold intervals. Going all out I might reach 170-180.
We have a winner 
….what’s your VO2max
We could assume your relative Vo2 now is around 75 and given your weight get the absolute. Another thing it would be interesting to know is if a higher untrained value also translates in higher ability to improve overtime in % terms.
Currently garmin V02 at 72 but has peaked at 77, weigh 66kg
The “magic” formula predicts ~72 for you as well. Reflecting on your numbers, one can see that all the improvements from training come from reduction of RHR. Max HR is fixed.
someone whose RHR is not decreasing overtime is someone who is not growing it’s engine.
Resting heart rate is mostly genetic and won’t change that much as you age unless you have big changes in fitness or develop health conditions etc.
Some have hummingbird hearts. Others have elephant hearts
This is slightly wrong. I think what you meant is potential min RHR is fixed and won’t change much. This could be true, what is your source?
On the other hand, observed RHR changes a lot, the main factors are Volume and frequency of training.
Mine hasn’t changed in 36 years , remaining in same same range and this past year I’ve seen same resting as recorded in the 90s. I’m now 56.
I have been active exercise wise my entire life.
Which are not age but life style determined.
Not so sure. My heart rate in my young years 16-19 would be resting rate roughly around 70. I didnt have equipment then was all done by myself counting my pulse…Max heart rate going back into my notes from running was often in the 180-190 range. I was predominately a runner doing 10k runs etc…I developed serious health issues at 19 but didnt notice a change in resting heart rate. Max heart rate at times after age 19 went through the roof…ie over 200…I didnt trust my counting then as it was racing faster then I could count.
At age 55 I started cycling. Resting heart rate was in the low 70s so no change from my early days. Always in the same sort of range.
Five years later my resting heart rate was in the low 40s. Currently at 62 resting heart rate is 42/43, depending on the day. Max heart rate now is 173.
similar, I started cycling at 54 after decades of working at a desk. RHR was about 78-82. Now 7 years later its 58-62bpm (HRmax 175). It dropped about 16 months ago, after more than a year of embracing doing a lot of endurance work and cutting back on intervals and intensity. And I got faster too, raised the floor and ceiling.