Brawner
Maximal heart rate fort betablocker treated patients
MaxHR = 164 - (0.7 x age in years)
Also see:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3755356/
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Also see intrinsic heart rate:
https://medcalc.uservoice.com/forums/104899-formula-suggestions/suggestions/4798905-intrinsic-heart-rate