Technical Details
- Variable Type: Discrete Metric
- Data Type: Float
- Units: N/A (ratio/factor)
- Column Name:
forward_upper_arm_forearm_speedup - Measurement: Ratio (or factor) of Peak Forearm Forward Angular Velocity to Peak Upper Arm Forward Angular Velocity—how much the forearm speeds up relative to the upper arm in the serve direction
Description
Forward upper arm forearm speedup quantifies the increase in peak angular velocity from the upper arm to the forearm during the serve. A value greater than 1 indicates the forearm reaches a higher peak forward angular velocity than the upper arm, completing the optimal Forward Kinematic Sequence (torso → upper arm → forearm).Use Cases
- Kinetic chain and energy transfer assessment
- Technique quality (proximal-to-distal speedup)
- Coaching and training feedback