Documentation Index
Fetch the complete documentation index at: https://docs.uplift.ai/llms.txt
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Technical Details
- Variable Type: Discrete Metric
- Data Type: Float
- Units: °
- Column Name:
arm_slot_angle - Aggregation: mean
- Precision: 0
- Measurement: Abduction angle of arm (shoulder to wrist) at ball release
- Reference: Vertical (adducted) = 0°
- Typical Range: 39 – 63 °
- Optimal Direction: N/A — depends on pitching style
Description
Arm slot angle measures the abduction angle of the arm (from shoulder to wrist) at ball release compared to vertical (adducted, 0°). Sidearm and submarine throwers have larger arm slot angles than overhand throwers. A perfectly side-arm release has an arm slot angle of 90°. Uplift’s arm slot categories broadly follow an article from Graeme Lehman: Do Different Arm Slots = Different Mechanics? https://treadathletics.com/arm-slot-differences/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 | 36 – 58 ° | 23 | 36 | 50 | 58 | 70 |
| High School | 41 – 60 ° | 29 | 41 | 50 | 60 | 69 |
| College | 41 – 71 ° | 34 | 41 | 55 | 71 | 88 |
| Professional | 38 – 61 ° | 30 | 38 | 52 | 61 | 84 |
| Broad (All Levels) | 39 – 63 ° | 29 | 39 | 51 | 63 | 75 |
Use Cases
- Arm slot classification
- Release angle assessment
- Pitch consistency tracking