The percentage drift between power and heart rate during the two halves of a ride, measuring aerobic endurance.
Aerobic Decoupling measures how your heart rate responds to steady power over time. In a long steady effort, if heart rate rises significantly while power stays the same (known as 'cardiac drift'), it indicates a lack of aerobic endurance for that duration.
((Pw:HR first half) - (Pw:HR second half)) / (Pw:HR first half)Low decoupling (<5%) indicates a strong aerobic base. High decoupling suggests you need more base miles before tackling higher intensity intervals.
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