> ## 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.

# Trunk Angle to Plate Foot Contact

> Trunk rotation angle relative to home plate at foot contact.

## Technical Details

* **Variable Type:** Discrete Metric
* **Data Type:** Float
* **Units:** °
* **Column Name:** `trunk_angle_to_plate_foot_contact`
* **Aggregation:** mean
* **Precision:** 0
* **Measurement:** Trunk rotation (twist or transverse) angle at foot contact
* **Reference:** 0° = facing home plate
* **Timing:** At foot contact event
* **Typical Range:** 71 – 105 °
* **Optimal Direction:** Middle — moderate values are optimal

## Description

Trunk angle to plate foot contact measures the trunk rotation angle relative to home plate at the instant of lead foot contact, where facing home plate is 0 degrees.

## 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              | 87 – 115 °                |  72  |  87  |  101 |  115 |  126 |
| High School        | 75 – 107 °                |  59  |  75  |  90  |  107 |  120 |
| College            | 69 – 95 °                 |  59  |  69  |  81  |  95  |  106 |
| Professional       | 51 – 82 °                 |  27  |  51  |  70  |  82  |  95  |
| Broad (All Levels) | 71 – 105 °                |  53  |  71  |  88  |  105 |  116 |

## Use Cases

* Trunk position assessment at foot contact
* Timing evaluation