HR prescription helper
Age, %HRmax, and formula → target bpm; see which published no-BCTT bands your choice overlaps.
ImportantRead this first
Not medical advice. Educational use only.
- This helper is for the age-predicted % band path when symptom-threshold testing (BCTT) is unavailable—not for symptom-only or RPE-only prescription.
- The bpm output is a ceiling, not a goal. Stop if symptoms rise ≥2/10 from session baseline.
- Published bands overlap without converging; matching a number to a paper does not validate it for your patient.
- Formulae (220−age vs 208−0.7×age) are not validated in adolescent PPCS specifically.
Why this exists
The installment No treadmill in the room argues that the literature does not give one universal %HRmax when BCTT is missing. Parents and clinicians still ask for a watch-readable number. This page separates that practical step from the article’s main claim.
Related reading: Figure 2 — overlapping %HRmax bands · A note on the formula
Estimated HRmax —
Target bpm (ceiling) —
Overlaps published bands —
Dashed brown line on Kozlowski row = ~75% symptom limit (observed); orange bar = RTP guidance <70% when HRt is unknown.
Boundaries
| Topic | What this tool does / does not do |
|---|---|
| PPCSexRx | The CRAN package encodes one published fallback. At age 16 and ~60–70% band its example lands near 133 bpm—illustration only, not a mandated dose. |
| Symptom cap | Always apply ≤2/10 rule from the pillar2-002 SOP. |
| Device | Wrist optical HR may misread vs chest strap in exercise testing contexts. |
| Pillar 4 | Fuller “ceiling not goal” checklists will live in future SOP installments; this page stays the calculator. |