VO2 max estimation

[NanuOp]

OpenStrap already captures resting heart rate, workout HR streams, age, sex, height, and weight from Apple Health — enough to estimate VO2 max without requiring a dedicated lab test or even a GPS-tracked outdoor run.

• HR-ratio method (simple, HR-only):

VO2max ≈ 15.3 × (HRmax / HRresting)

• HRresting — already available from HKQuantityTypeIdentifierRestingHeartRate (recent average)
• HRmax — either (a) the highest recorded HR across logged workouts, or (b) age-predicted via 220 - age as a fallback when no high-intensity data exists

document-2026-09-05T03-10-54-957Z.md

So my estimate was around like 61 ml/kg/min

But on OmniCalculator

It's around 65 ml/kg/min

Would be happy if this feature adds