Technical Details
- Variable Type: Discrete Metric
- Data Type: Float
- Units: degrees (°)
- Column Name:
cocking_phase_shoulder_horizontal_abduction(despite the column name, this metric is shoulder abduction, not horizontal abduction; the column name will be corrected in a future release) - Measurement: Abduction angle of the dominant shoulder (relative to the trunk) at the Max Shoulder ER event
- Optimal Direction: Middle — moderate values are optimal
Description
Cocking phase shoulder abduction measures how far the dominant upper arm is raised away from the side of the trunk at the Max Shoulder ER event. It reflects the arm slot of the cocking position ahead of acceleration.Normative Ranges
Percentile distributions by competition level from the 2026 Q2 dataset; the optimal range spans the 25th–75th percentiles. High School and College samples are not yet available. See Tennis Overhand Serve: Normative Ranges for the full tables.Use Cases
- Cocking phase mechanics
- Shoulder loading assessment
- Injury risk screening