Documentation Index
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Technical Details
- Variable Type: Discrete Metric
- Data Type: Float
- Units: °
- Column Name:
trunk_angle_to_plate_release - Aggregation: mean
- Precision: 0
- Measurement: Trunk rotation (twist or transverse) angle at ball release
- Reference: 0° = facing home plate
- Timing: At ball release event
- Typical Range: -17 – -5 °
- Optimal Direction: Middle — moderate values are optimal
Description
Trunk angle to plate release measures the trunk rotation angle relative to home plate at the instant of ball release, 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 | -18 – -3 ° | -23 | -18 | -12 | -3 | 5 |
| High School | -16 – -5 ° | -23 | -16 | -11 | -5 | -1 |
| College | -15 – -6 ° | -22 | -15 | -11 | -6 | 2 |
| Professional | -17 – -5 ° | -25 | -17 | -11 | -5 | 0 |
| Broad (All Levels) | -17 – -5 ° | -23 | -17 | -11 | -5 | 2 |
Use Cases
- Trunk position assessment at release
- Rotation evaluation