> ## 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.

# Downswing Duration

> Duration from Top of Swing (P4) to Impact (P7).

## Technical Details

* **Variable Type:** Discrete Metric
* **Data Type:** Float
* **Units:** seconds (s)
* **Column Name:** `downswing_duration`
* **Aggregation:** mean
* **Precision:** 2
* **Calculation:** (P7 Impact frame − P4 Top of Swing frame) / fps
* **Optimal Direction:** N/A

## Description

Downswing Duration measures the time from the top of the backswing to impact. It is used together with Upswing Duration to compute the Dynamic Tempo Ratio.

## Use Cases

* Tempo analysis
* Dynamic Tempo Ratio input