> ## 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 Trunk Angular Velocity

> The instant the trunk reaches its maximum rotational (twist) velocity during the downswing.

## Technical Details

* **Variable Type:** Event
* **Data Type:** Integer
* **Units:** Frame number
* **Column Name:** `peak_trunk_angular_velocity_frame`
* **Required for QA:** False
* **Measurement:** Frame of maximum trunk angular velocity about the twist axis, searched between Top of Swing and Release
* **Timing:** Between P4 Top of Swing and P8 Release

## Description

This event identifies the moment when the trunk reaches its maximum angular velocity during the downswing, representing peak torso rotational power.

## Use Cases

* Kinematic Sequence order
* Peak Trunk Velocity metric