Useful tools to establish power and heart rate performance metrics.
Variability Index (VI) in cycling measures the fluctuation in power output during a ride relative to the average power. It's calculated by dividing the normalized power (the average power output adjusted for fluctuations) by the average power for the same ride. VI indicates how smoothly or erratically power was applied throughout the ride, with lower values suggesting a more consistent effort and higher values indicating greater variability. Monitoring VI helps athletes assess pacing strategies, efficiency, and overall ride quality, allowing them to refine their training approach for improved performance and efficiency.
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