Had a 38.8 reading running 3.29 km, for 22 mins at 6:49 / km pace . Avg heartbeat is 167
4 days later , Dropped to 36.8 reading running 3.57km, for 25 mins at 6:33 / km pace. Avg heartbeat is 168
I feel I had improved in the 2nd run , yet vo2 max dropped to below average for my age at above 40 years old .
Anyone knows how this is calculated ?
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It’s an estimate, and clearly states that within the health app. It can only be measured accurately with specialised equipment in a controlled environment.