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🏃 Maximum Heart Rate (Tanaka / Fox)

UseWhen to use: exercise prescription / stress-test intensity when measured HRmax unknown.

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StrataLarge individual scatter — prefer measured HRmax from GXT when available.

LimitsWhen not to use: beta-blockers / chronotropic incompetence. · Pitfall: treating prediction as exact. · Not a ischemia diagnostic.

SourceTanaka H et al. HRmax; classic Fox 220−age

Runs locally in your browser (no PHI uploaded). For licensed clinicians — not a substitute for clinical judgement.
Stored on this device for revisit reminders

This-shift next steps

After scoring: open the scene pack, peer scores, and the matching pathway. Local reference — no HIS write.

Paste the link in Slack, Teams, X, or LinkedIn — the preview image comes from this page’s Open Graph card.

Methodology · worked example, guidelines & full notes
Clinical takeaway

Tanaka vs Fox.

When to use

When to use: exercise prescription / stress-test intensity when measured HRmax unknown.

How it works

Tanaka: 208 − 0.7×age; Fox: 220 − age.

Key points

  • Tanaka vs Fox.
  • %HRmax cues.
  • Next: measured GXT if critical.

References

  • Tanaka H et al. HRmax; classic Fox 220−age

Worked calculation

The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.

Age50 y
Formula emphasisTanaka primary

→Tanaka HRmax173/min

  • Tanaka (208−0.7×age)：173
  • Fox (220−age)：170
  • ~70% HRmax：121
Age50 y
Formula emphasisFox primary

→Fox HRmax170/min

  • Tanaka (208−0.7×age)：173
  • Fox (220−age)：170
  • ~70% HRmax：119
Verification & sources · governance
FAQ

Frequently asked questions

Does Maximum Heart Rate (Tanaka / Fox) upload patient data? Where is it calculated?
Calculation runs locally in the browser; inputs and results are not uploaded. For licensed clinicians only; interpret with history, investigations and local protocols — not a diagnosis or prescription.
How is Maximum Heart Rate (Tanaka / Fox) calculated in practice? Can you show a worked example?
Inputs: Age 50 y, Formula emphasis Tanaka primary → Result: Tanaka HRmax 173 /min（Tanaka (208−0.7×age): 173, Fox (220−age): 170, ~70% HRmax: 121） Inputs: Age 50 y, Formula emphasis Fox primary → Result: Fox HRmax 170 /min（Tanaka (208−0.7×age): 173, Fox (220−age): 170, ~70% HRmax: 119）
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