Age: 37
Resting HR 38bpm (last measured about 8 months ago)
Max HR 205bpm (last reached last week during Zwift race)
HR range 167bpm
Resting HR is correlated with VO2max (see p884):
Max HR less so. It’s why the formula Max/Resting * 15 (edit: not 3.5 lol) gives a ballpark estimate of VO2, and why changes in resting rate in this formula lead to larger changes in VO2max than changes in max HR.
Resting HR correlates well with stroke volume. Given that cardiac output is SV * HR, in order to maintain the same cardiac output if your resting HR has dropped, your stroke volume must of increased.
In turn, stroke volume is one of the largest determinants of VO2max.
Factors affecting max heart rate are less well understood. Age alone only explains maybe 20% of person-to-person variation in observed max heart rate (Ie: age based formulas are quite inaccurate due to imprecision).
However, it’s thought that LV filling likely determines max HR - ie: if your HR is so fast that your LV can’t fill with enough blood between contractions, this (working together with your carotid baroreceptors) will then place an upper limit on your HR. As a result, factors that determine LV filling (preload, diastolic function, etc) are likely what limit max HR. See section 2.4:
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What is your Vo2 max?
Right now, Garmin says 58, but I’m in the middle of a recovery week after a high volume week. A week ago it was 61. It was as high as 67 at peak in the past year with roughly the same max and resting HR.
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This number doesn’t really work….for me
(195/52)*3.5 = 13.125 ???
Mmm. So you have the highest HRR but an average VO2max. Not good for the correlation
VO2max (relative) ~= 15 * (HRmax/RHR)
+/- 2.7 ml/kg/min (+/- 4.5%)
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Lol I remember that scalar wrong. It’s multiplied by ~15, not 3.5. Somewhat different numbers… 
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What is this part of the formula?
For the test group in the study it was accurate within plus or minus 4.5%. Or say the formula estimates a vo2max of 50 ml/kg/min, then it’s plus or minus 2.7.
Or said another way, your actual is likely between 47.3 and 52.7 using the +/- 2.7.
Male
31
RHR: 44-ish
Max HR: 195
HRR: 151
I’ve had my RHR down as low as 39 before, but that was a couple years ago.
Cool. But for me the formula gives 56.25 +|- 2.7…….The formula correctly estimates Egan Bernal around 88
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Estimates are estimates, my rhr fluctuates thru the week by 4bpm (between 58 and 62bpm) and that alone gives a range of estimated vo2max from 42-45. Right now I’m seeing 44 on Garmin, and it basically matches WKO5 when my PDC has enough good data.
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Yes! Garmin gets a bad rap here, but for me the estimates (ftp, VO2max and LTHR) seem pretty accurate. Vo2 fluctuates between 56-58 in Garmin for me.
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Math works pretty well for me
183/45*15=61 my Garmin VO2 max predictor is 59.
Edit I am 38 years old 6’1" and 78kg.
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two days ago after some mixed intervals (tempo and above threshold):
and vo2max of 44 ml/kg/min.
I’m using these for targets:
- 272W FTP
- 161bpm LTHR
and ‘flexing’ as needed during workout, and for analyzing zones.
I’ve been seeing really good Garmin estimates since buying this Edge 530 in September 2019.
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Male
52
RHR: 46-ish
Max HR: 190
HRR: 144
Age 30
Male
RHR: Lowest seen whilst watching cycling on the couch is 33BPM, don’t have 24/7 monitoring though. Usually floating around 40.
Max HR: 177BPM (going all-out for 7’ in 32-33 deg C heat to get a Strava Segment)
VO2Max from Inscyd cycling test: 71, Garmin estimate 72 for cycling and 64 for running
FTP: 318W (4.8W/kg)
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Age: 30
Resting HR: 50
Resting (in bed): 42
Max HR: 193
Vo2max (lab tested): 72
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Male, 41.
Resting 46 (42-43 while sleeping)
Max 186
HRR 140