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Fitbit Cardio Fitness Score

‎08-23-2018 15:36

‎08-23-2018 15:36

Im curious as to how cardio fitness score is calculated. The reason I ask is because my cardio fitness score is 82 (supposedly) and that feels maybe too high. My heart rate is about 120-30 when I do 5k, which I run in about 19 minutes. 

 

Could anyone tell me a) how its calculated and b) How it compares to the average? 

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‎08-23-2018 17:03 - edited ‎08-24-2018 16:21

‎08-23-2018 17:03 - edited ‎08-24-2018 16:21

If the 'cardio score' is supposed to approximate VO2 max, then 82 is quite high. It is age & sex dependent, but for a 30 yr old male, a 19 minute 5k calculates out to about VO2 max = 53 (Still quite good). You can find a calculator for VO2 max from known performance here. (sorry it is in Dutch, but easy to figure out) They also predict various  race times from a given VO2 max, 82 for a 30 yr old man would predict a 13:00 minute 5k. Basically, 82 is world class (e.g. 3:52 mile), I would first suspect your heart rate of ~125 while running 6-min mile pace for extended periods (check with a chest strap) . Even if you are quite fit at age 28, I would expect HRs more like 150-180 for that sort of effort (conservative/book max HR 192)

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