> ## Documentation Index
> Fetch the complete documentation index at: https://docs.uplift.ai/llms.txt
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# Scap Load at Launch

> Amount of rear shoulder flexion (+) or extension (-) at launch event. Flexion/Extension translates to horizontal adduction (+) and abduction (-), respectively.

## Technical Details

* **Variable Type:** Discrete Metric
* **Data Type:** Float
* **Units:** °
* **Column Name:** `rear_scap_load_at_launch`
* **Aggregation:** mean
* **Precision:** 0
* **Measurement:** Rear shoulder flexion/extension at launch
* **Positive:** Flexion (horizontal adduction)
* **Negative:** Extension (horizontal abduction)
* **Typical Range:** -8 – 19 °
* **Optimal Direction:** Middle — moderate values are optimal

## Description

Scap load at launch measures the amount of rear shoulder flexion or extension at the launch event, indicating the loading and preparation of the rear shoulder for power generation.

## 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              | -4 – 18 °                 |  -16 |  -4  |   6  |  18  |  28  |
| High School        | -6 – 23 °                 |  -18 |  -6  |  10  |  23  |  33  |
| College            | -8 – 16 °                 |  -28 |  -8  |   4  |  16  |  32  |
| Professional       | -16 – 16 °                |  -31 |  -16 |   0  |  16  |  29  |
| Broad (All Levels) | -8 – 19 °                 |  -25 |  -8  |   5  |  19  |  31  |

## Use Cases

* Rear shoulder loading analysis
* Scapular mechanics assessment