Equation 3 220 − 40 (age in years) = 180 bpm 180 bpm (MHR) − 65 bpm (RHR) = 115 bpm (HRR) 0.7 (70%) × 115 bpm (HRR) + 65 bpm (RHR) = 145.5 bpm 0.8 (80%) ...
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