> ## 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 Upper Arm Twist Angular Velocity

> Peak twist angular velocity of the upper arm segment.

## Technical Details

* **Variable Type:** Discrete Metric
* **Data Type:** Float
* **Units:** degrees/second (°/s)
* **Column Name:** `arm_peak_twist_angular_velocity`
* **Measurement:** Peak twist (like a tornado) angular velocity of the upper arm

## Description

Peak upper arm twist angular velocity is the maximum rotation speed of the upper arm in the transverse plane (twisting like a tornado).
It is part of the [Twist Kinematic Sequence](/biomechanics/activities/tennis/metrics/twist-kinematic-sequence) (torso-upper\_arm-forearm), reflecting upper arm contribution to the kinetic chain.

## Use Cases

* Twist kinematic sequence and energy transfer
* Arm contribution to serve
* Comparison with peak torso and forearm twist velocities