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# Elbow Flexion at Ball Contact

> Amount of rear elbow flexion at ball contact event. This measures the elbow angle at the instant of impact.

## Technical Details

* **Variable Type:** Discrete Metric
* **Data Type:** Float
* **Units:** °
* **Column Name:** `rear_elbow_flexion_at_ball_contact`
* **Aggregation:** mean
* **Precision:** 0
* **Measurement:** Rear elbow flexion angle
* **Timing:** At ball contact event
* **Typical Range:** 60 – 90 °
* **Optimal Direction:** Middle — moderate values are optimal

## Description

Elbow flexion at ball contact measures the amount of rear elbow flexion at the moment of ball contact, indicating the arm position and extension during impact.

## 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              | 70 – 90 °                 |  62  |  70  |  82  |  90  |  101 |
| High School        | 69 – 93 °                 |  50  |  69  |  81  |  93  |  108 |
| College            | 48 – 86 °                 |  35  |  48  |  70  |  86  |  104 |
| Professional       | 42 – 74 °                 |  31  |  42  |  60  |  74  |  97  |
| Broad (All Levels) | 60 – 90 °                 |  37  |  60  |  75  |  90  |  101 |

## Use Cases

* Impact position analysis
* Rear elbow mechanics assessment
* Contact evaluation