> ## Documentation Index
> Fetch the complete documentation index at: https://docs.uplift.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Peak COM Velocity

> Maximum center of mass velocity during a specified phase of the jump or landing.

## Technical Details

* **Variable Type:** Discrete Metric
* **Data Type:** Float
* **Units:** m/s
* **Column Name:** Varies by phase (see Events/Phases)
* **Aggregation:** mean
* **Precision:** 2
* **Optimal Direction:** Higher is better
* **Measurement:** Maximum vertical component of center of mass velocity during the specified phase

## Events / Phases

This metric can be reported during the following phases:

* **Takeoff Eccentric:** From [Initiation](/biomechanics/activities/jump/events/initiation) to [Bottom](/biomechanics/activities/jump/events/bottom). Maximum COM velocity during the downward (loading) phase.
* **Takeoff Concentric:** From [Bottom](/biomechanics/activities/jump/events/bottom) to [Takeoff](/biomechanics/activities/jump/events/takeoff).
  * Column example: `jumping_com_peak_velocity`. Reflects push-phase effectiveness and correlates with jump height.
* **Landing Eccentric:** From [Landing](/biomechanics/activities/jump/events/landing) to [Landing Bottom](/biomechanics/activities/jump/events/landing-bottom).
  * Column example: `landing_com_peak_velocity`. Reflects how fast the body is moving downward during absorption.
* **Landing Concentric:** From [Landing Bottom](/biomechanics/activities/jump/events/landing-bottom) to [Termination](/biomechanics/activities/jump/events/termination). Maximum COM velocity during the stand-up (recovery) phase. Column names vary by implementation.

## Description

Peak COM velocity is the center of mass maximum vertical velocity during a given phase—either the eccentric or concentric portion of the jump or landing.
It is used to assess loading speed, push effectiveness, and landing absorption or recovery. The phase determines which column name applies.

## Use Cases

* Countermovement depth and speed (takeoff eccentric)
* Concentric phase performance and jump height (takeoff concentric)
* Landing absorption and stiffness (landing eccentric)
* Landing recovery (landing concentric)