> ## 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.

# Pelvis Deceleration Time

> Time from peak pelvis angular velocity to pelvis termination (end of rotation). This measures the deceleration phase of the pelvis during the swing.

## Technical Details

* **Variable Type:** Discrete Metric
* **Data Type:** Float
* **Units:** seconds
* **Column Name:** pelvis\_decceleration\_time
* **Aggregation:** mean
* **Precision:** 2
* **Calculation:** Pelvis termination time - Peak pelvis velocity time
* **Typical Range:** 0.34 – 0.68 s
* **Optimal Direction:** Middle — moderate values are optimal

## Description

Pelvis deceleration time measures the duration of the pelvis deceleration phase from peak angular velocity to the end of rotation, indicating the control and efficiency of lower body mechanics.

## Normative Ranges

Percentile distributions by competition level from the 2026 Q1 dataset; the optimal range spans the 25th–75th percentiles.

| Population         | Optimal Range (25th–75th) | 10th | 25th | 50th | 75th | 90th |
| ------------------ | ------------------------- | :--: | :--: | :--: | :--: | :--: |
| Youth              | 0.21 – 0.72 s             | 0.17 | 0.21 | 0.57 | 0.72 | 1.10 |
| High School        | 0.41 – 0.74 s             | 0.16 | 0.41 | 0.49 | 0.74 | 1.10 |
| College            | 0.34 – 0.65 s             | 0.15 | 0.34 | 0.48 | 0.65 | 0.83 |
| Professional       | 0.35 – 0.57 s             | 0.14 | 0.35 | 0.46 | 0.57 | 0.80 |
| Broad (All Levels) | 0.34 – 0.68 s             | 0.16 | 0.34 | 0.50 | 0.68 | 0.99 |

## Use Cases

* Deceleration phase analysis
* Control assessment
* Lower body mechanics evaluation