Health & Fitness
Aerobic Decoupling Calculator
Measure aerobic efficiency by comparing heart rate to pace/power drift between the first and second half of a workout.
Preparing your result…
What this calculator does
Calculates Aerobic Decoupling Calculator using the formula verified against the cited source.
What your result means
An estimate from the inputs you enter, within the scope stated below — not advice.
Formula
Efficiency E = power ÷ HR (or speed ÷ HR) for each half; decoupling (fall in efficiency) = 100 × (E₁ − E₂) ÷ E₁
The step-by-step working for your own numbers appears with the result above and in the PDF report.
Frequently asked questions
Symbols and assumptions
- Inputs
- The values entered in the fields above
- • Let E1,E2 be first-/second-half efficiency, using power/HR or speed/HR consistently. Percent fall in efficiency=100(E1−E2)/E1; the signed percent change=100(E2−E1)/E1 is its negative. State which sign convention is displayed.
Sources and review
Reviewed 2026-10-18 · Next review 2027-04-18
- • Do not divide time-per-distance pace by HR and interpret it as speed efficiency. Define input as precomputed efficiency ratio, duration split and treatment of stops. This is meaningful mainly for sustained steady aerobic efforts; two numbers cannot reproduce the platform’s entire time-series processing.
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
Quick reference
| Scenario | First half: average power or speed | First half: average heart rate (bpm) | Second half: average power or speed | Aerobic decoupling (positive = efficiency fell) |
|---|---|---|---|---|
| Worked example | 200 | 140 | 200 | 4.7619 % |
| Half the amounts | 100 | 70 | 100 | 5.4054 % |
| Double the amounts | 400 | 220 | 400 | 0 % |
Need the full picture? Get the detailed PDF report with charts, tables, formulas and working steps.
Reviewed 2026-10-18 · Next review 2027-04-18
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