Aerobic Decoupling (Pw:Hr and Pa:HR) and Efficiency Factor (EF)

Efficiency factor (EF) is the ratio of Normalized Power to heart rate (cycling) or Normalized Graded Pace to heart rate (running) for a given activity.  An increase in this value for steady-state, aerobic endurance intensity rides may indicate an improvement in aerobic fitness.

 

Aerobic Decoupling compares the Efficiency factor from the first half of an activity to the second have. A smaller change in EF (less than 5%) from the first half to the second half may indicate improving aerobic endurance.

 

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