Variability (VI)

Variability in endurance sports refers to the fluctuations in power output during a training session or race. It is measured as the ratio of weighted power to average power output.

The ratio of weighted power to average power output, known as variability index (VI), is a measure of how evenly power is distributed during an activity. A lower VI indicates a more even distribution of effort, while a higher VI indicates greater variability in power output. This information can be used by athletes and coaches to optimize training strategies and improve performance.

By monitoring variability and aiming to reduce VI, athletes can work towards more consistent power output and better pacing strategies, which can lead to improved performance in endurance sports such as cycling, running, and triathlon.

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