> ## 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.

# Descent Time

> Time from stand to sit for each sit-to-stand repetition, and its mean across the capture.

## Technical Details

* **Variable Type:** Discrete Metric
* **Data Type:** Float
* **Units:** seconds (s)
* **Column Name:** `descent_time`, `mean_descent_time`
* **Optimal Direction:** N/A
* **Measurement:** Time from [Stand](https://docs.uplift.ai/biomechanics/activities/stability/sit_to_stand/events/stand) to [Sit](https://docs.uplift.ai/biomechanics/activities/stability/sit_to_stand/events/sit) of the same repetition

## Variants

* **Descent Time** (`descent_time`) (per repetition): time from Stand to Sit.
* **Mean Descent Time** (`mean_descent_time`) (summary): average Descent Time across all analyzed repetitions.

## Description

Descent Time is the duration of the sitting-down portion of each repetition.
A short Descent Time contributes to a faster test, but a very short descent can indicate an uncontrolled drop into the chair, so it has no single optimal direction.

## Use Cases

* Descent control
* Comparison with [Rise Time](https://docs.uplift.ai/biomechanics/activities/stability/sit_to_stand/metrics/rise-time)
* Explaining differences in [Repetition Time](https://docs.uplift.ai/biomechanics/activities/stability/sit_to_stand/metrics/repetition-time)


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