Sway

Binary indicator of excessive lateral movement of the pelvis just prior to swing.

Technical Details

• Variable Type: Discrete Metric
• Data Type: Boolean
• Units: True/False
• Column Name: sway
• Threshold: 8 cm (~3 in) lateral movement
• Measurement: Pelvis position difference around max knee raise

Description

Sway indicates excessive lateral movement of the pelvis during the swing, which can compromise balance and power generation. Sway is determined by the difference in farthest forward and backward pelvis position (forward = towards the pitcher) between intitiation (start of any movement) and max knee raise event. Lateral movement distance threshold for sway fault is 8 cm (~3 in)

Sway is a method of measuring pre-swing sway movement, which can be used in combination with Sway Leg, measured by rear leg alignment.

Use Cases

• Balance analysis
• Movement efficiency assessment
• Stability evaluation