Variability Index (VI)

VI is determined by dividing Normalized Power™ by average power. A VI of 1.0 would mean perfect pacing, but hilly terrain make this nearly impossible due to the fluctuations in wattage output while climbing.

Normalize Power (NP) ™, Intensity Factor (IF)™, and Training Stress Score (TSS)™ are all registered trademarks of Peaksware, LLC.