> ## 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 Knee Extension Velocity

> Maximum knee angular velocity, either flexion or extension depending on the phase.

## Technical Details

* **Variable Type:** Discrete Metric
* **Data Type:** Float
* **Units:** degrees/s
* **Column Name:** Varies by phase (see Events/Phases); left/right in bilateral, single value in single-leg
* **Aggregation:** mean
* **Precision:** 0
* **Optimal Direction:** Higher is better
* **Measurement:** Maximum rate of change of knee angle during the specified concentric phase

## Events / Phases

This metric can be reported during the following concentric phases:

* **Takeoff Concentric:** From [Bottom](/biomechanics/activities/jump/events/bottom) to [Takeoff](/biomechanics/activities/jump/events/takeoff).
  * Maximum knee extension velocity during the propulsive jumping phase.
  * Column examples: `jumping_left_knee_peak_extension_velocity`, `jumping_right_knee_peak_extension_velocity` (bilateral); `jumping_knee_peak_extension_velocity` (single-leg).
* **Landing Concentric:** From [Landing Bottom](/biomechanics/activities/jump/events/landing-bottom) to [Termination](/biomechanics/activities/jump/events/termination).
  * Maximum knee extension velocity during the stand-up phase.
  * Column names vary by implementation; left/right in bilateral.

## Description

Peak knee extension velocity is the maximum angular velocity of knee extension during a concentric phase—either the push phase of the jump (takeoff concentric) or the stand-up phase after landing (landing concentric).
It reflects knee power and contribution to takeoff or recovery.
The phase determines which column name applies.

## Use Cases

* Knee power and contribution to jump or stand-up
* Kinematic sequence and timing
* Technique and training assessment