FC Máxima Tanaka

Tanaka HRmax: a refined alternative to 220 − age

Published by Tanaka, Monahan and Seals in JACC 2001, this formula estimates maximum heart rate from age and lands closer to the truth than the old 220 − age rule: HRmax = 208 − 0.7 · age. Its standard error sits around ±10 bpm, a bit tighter than the ±12 bpm you get from the Fox formula. Below age 40 the two barely differ. Past 40, though, Tanaka gives you a higher number. Example: at 60 years old, Fox says 160 bpm while Tanaka says 166 bpm. A couple of other validated options exist too: Gellish 191.5 − 0.007·age² and Inbar 205.8 − 0.685·age. Still, Tanaka is the one you'll see most often, both in the research and in the training apps people actually use.

Applications: training zones and clinical use

It anchors your training heart-rate zones (Z1-Z5 expressed as %HRmax). In cardiac rehab after a heart attack or surgery, it helps set an intensity that's safe to push toward. It shows up in ergometric tests as the maximum-effort target, and clinicians lean on it when writing exercise prescriptions for hypertension, diabetes and obesity. When there's no direct test on file, wearables like Garmin, Polar and Apple Watch fall back to Tanaka or something close to it.

FAQ

Tanaka or 220 − age? Across the general population Tanaka misses by less, and the gap widens past age 40. The old 220 − age tends to come in too low for older adults.

Does it work for trained athletes? If you're highly conditioned, nothing beats a direct maximal test on a treadmill or cycle ergometer. Treat any formula as a rough starting point, no more.

How do I find my training zones? Take your HRmax and multiply by the percentage you want: Z2 60-70% (light aerobic), Z3 70-80% (aerobic), Z4 80-90% (threshold), Z5 90-100% (max).

Why is the standard error ±10 bpm? Your HRmax is shaped by genetics, training history and plenty of other things age can't see. A formula tells you where the population average falls, not where you personally land.