Variability Index (VI)

Variability Index (VI) provides a deeper insight into the physiological demands of a workout or Event.

What is Variability Index (VI)?

Variability Index (VI) is the ratio of Normalized Power to Average power for a workout or workout selection. The greater the VI, the more variable and less continuously aerobic the effort.

What do I need to calculate VI?

For TrainingPeaks to calculate VI for your ride or segment of the ride we require three things:

  1. You need a power meter.
  2. A device that records the power channel from your power meter e.g. Garmin, Wahoo, Suunto device.
  3. A power threshold that is specific to your completed workout.  Make sure that you have a power threshold set in your account settings.

Where can I find my workout's VI?

Workout Expando Summary

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Workout Expando Selection

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TrainingPeaks Mobile App

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VI reference values

Variability Index for Common Rides

Type of Ride Variability Index
Steady isopower workout (endurance ride) 1.00-1.02
Flat Road Race 1.00-1.06
Flat Time Trial 1.00-1.04
Hill-Climb Time Trial 1.00-1.06
Flat Criterium

1.06-1.35

Hilly Criterium 1.13-1.50
Hilly Road Race 1.20-1.35
Mountain Bike Race/Cyclocross Race 1.13-1.50

 

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