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Heartbeat economics

What these metrics describe

Heartbeat economics looks at distance or elevation alongside estimated heartbeats across your own repeated runs. It is a descriptive trend, not a medical measure, ranking, or training-load score.

Core measures

  • Heartbeat Count: estimated from valid heart-rate samples and elapsed time.
  • Distance Economy: distance divided by estimated heartbeats, shown as metres per ten beats.
  • Elevation Economy: elevation gain divided by estimated heartbeats.
  • Aerobic Stability: the change in distance-per-heartbeat efficiency between the first and second halves of a sustained run.

Heartbeat Count is calculated as heart rate (bpm) x interval seconds / 60 for valid records. Distance and elevation economy use that estimate as their denominator.

When results appear

Economy values need a running or trail-running FIT activity with usable heart-rate samples covering at least 80% of timed intervals. Aerobic Stability also needs a sustained effort: at least 20 minutes, 60 records, and usable data in both halves.

Qualifying runs contribute to your baseline. Evidence is shown as limited for 1-3 runs, moderate for 4-7, and strong for 8 or more. Missing values mean the file does not contain enough relevant evidence, not that your fitness declined.

Read the trend in context

Compare your own qualifying runs over time alongside pace, terrain, weather, fatigue, stops, and sensor quality. Do not compare absolute values between people or use a metric to override pain, fatigue, or medical advice.