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Compare percentage-of-maximum and Karvonen reserve-based zones.
Generally healthy adults aged 20 or older. Not medical exercise clearance.
Predicted maximum = 208−0.7age (Tanaka) or 220−age. Standard zones multiply maximum by percentages. Karvonen uses resting + percentage × (maximum−resting). Five 10-point bands cover 50–100% for illustration; they are not prescribed training targets.
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Educational estimates, with their equations and assumptions. They do not diagnose a condition or prescribe a treatment.