Xert Equivalent Power (XEP)

Xert Equivalent Power (XEP) is a metric in Watts that estimates the physiological demand of an activity by adjusting for fatigue and intensity, offering a more accurate measure of relative effort than average power alone. XEP is mainly used for effort comparison, not for predicting power sustainability or calculating XSS.

Summary Generated by AI

Definition

Xert Equivalent Power (XEP), calculated in Watts, represents the average power that more closely reflects how demanding an activity felt physiologically.

It adjusts for fatigue and intensity distribution, providing a better estimate of relative effort than simple average power.

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What It Means

The more time you spend working near MPA, the higher your XEP will be relative to your average power.

For example:

• A steady endurance ride → XEP will be close to average power
• A race with repeated surges near MPA → XEP will be significantly higher than average power

XEP attempts to capture the true physiological cost of an activity across 3 dimensions of fitness in a single number.

Important Notes

• XEP is used for relative effort comparison, not for predicting how long you can sustain a given power.
• It is not used to calculate XSS.
• Like any single-number metric, it simplifies complex multi-system fatigue into one value.

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Where You’ll See It

• On Activity Dashboard & Activity Details pages
• In certain workout summaries
• In data field metrics (XSS & XEP or Xert Dashboard data fields for ConnectIQ)

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Related Terms

• Xert Strain Score (XSS)
• MPA
• Difficulty Score
• Average Power