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# 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


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