Peak Power (PP) – Knowledgebase

Peak Power (PP) is your maximum sprint power, representing the highest possible power output and explosive ability. It is a key part of your Fitness Signature in Xert, affecting MPA modeling and high-intensity training. Accurate PP measurement requires maximal sprints; underestimation can occur without them.

Summary Generated by AI

Definition

Peak Power (PP) is your highest possible power output - essentially your maximum sprint power.

It is one of the core three parameters that make up your Fitness Signature, along with TP and HIE. When you are fully fresh, your MPA starts at Peak Power.

Peak Power is sometimes referred to as Pmax in other software.

What It Represents

Peak Power reflects your short, explosive ability to generate power.

Having a greater Peak Power generally means:

Stronger sprinting ability
More explosive accelerations
Greater contribution to short, high-intensity efforts

Because Peak Power is the upper anchor for MPA, it also influences how Xert models fatigue and recovery during hard riding.

How Xert Uses It

Peak Power plays a key role in:

Your Fitness Signature
Your MPA's maximum/starting value (when fresh)
Determining a realistic HIE value

If Peak Power is underestimated, your MPA modeling and high-intensity training targets may also be less accurate.

A Simple Way to Test Your Peak Power

Do 2–4 short sprints of 5–10 seconds each
Use a big gear and sprint from a rolling start (not from a dead stop). Stand up and accelerate hard - aim to spin up quickly (often 110-120+ rpm by the end of the sprint).
- If helpful, use a short rise/hill: carry some speed into it, then sprint as you hit the base.
Take plenty of easy recovery between efforts (several minutes) so each sprint is truly maximal.

Important Note: If your training history in Xert contains mostly steady workouts (especially imported indoor structured workouts without any max effort sprints), Peak Power may be underestimated. Adding a few maximal sprints can quickly improve accuracy.

Where You’ll See It

In your Fitness Signature
On Activities Dashboard & Details Pages
On Breakthrough Reports (if PP changes)
In Power Duration Curve modeling
In MPA-based data fields: Rainbow Gauge, XDB, EBC

Common Misunderstandings

Peak Power can be higher than your best 1-second power — If your top sprint happened under fatigue (with MPA already reduced), Xert may estimate that your fresh peak power would be higher.
Peak Power can also be underestimated — if you haven’t performed recent all-out sprints.
Improving Peak Power isn’t required for all events — but accurately measuring it improves modeling.

Related Terms

Fitness Signature
MPA
High Intensity Energy (HIE)
Threshold Power (TP)
Power Duration Curve