Weekly dose helper
Session minutes × frequency → weekly aerobic volume; compare to published thresholds from Howell 2021 and related actigraphy studies.
ImportantRead this first
Not medical advice. Educational use only.
- Thresholds shown are observational cutoffs from published cohorts—not validated prescription targets for every adolescent with PPCS.
- Symptom cap always wins: stop if symptoms rise ≥2/10 from session baseline, regardless of whether a weekly minute total is met.
- Meeting a minute total does not replace intensity rules from your chosen path (BCTT, %HRmax, or symptom-only).
- Published thresholds were derived in acute/subacute or actigraphy-tracked samples; extrapolation to slow PPCS requires clinical judgment.
Why this exists
The installment Twenty minutes from where? argues that weekly volume may matter more than the ritual of “20 minutes per session.” Families still need a practical way to compare schedules. This helper multiplies session length by frequency and maps the product to literature-reported bands.
Related reading: Figure 1 — session duration vs weekly dose · Section 3 — total dose as the variable
Weekly aerobic volume 100 min/wk
Thresholds are illustrative bands from observational papers—not mandates. Intensity must stay sub-symptom for your patient.
Boundaries
| Topic | What this tool does / does not do |
|---|---|
| Single-session dogma | Shows equivalent weekly totals across schedules; does not prove any one schedule is optimal. |
| Howell 160 | ROC cutoff for symptom-free at 1 month in one acute cohort—not a PPCS trial primary endpoint. |
| Sleep 150 | From a separate paper on PSQI improvement PMID: 38032838—not interchangeable with symptom thresholds. |
| pillar2-002 | HR% and BCTT paths are orthogonal; use the HR helper for bpm ceilings. |