Dimensions
Required Inputs for processing:- handedness: the handedness of the athlete [‘left’, ‘right’]
Variables
Output variables from hitting analysis.Events
Identify specific time points during the swing.| Event | Data Type | Description | Column Name |
|---|---|---|---|
| Top Backswing | Int | Highest position during the backswing. | “ |
| Max X Factor | Int | Maximum rotational (twist) difference between hips and shoulders. | “ |
| Peak Wrist Angular Velocity | Int | Maximum angular velocity of the wrists rotating about the body. | “ |
| X Factor Zero Crossing | Int | The instant hips and shoulders have no rotational difference after max X Factor. When shoulders are stacked directly on top of hips. | “ |
| Ball Contact | Int | The instant the club strikes the ball, estimated as the frame when the wrists are closest to the pelvis. | “ |
| Follow Through | Int | The end of the swing, determined by the max hip shoulder separation after ball contact. | “ |
Discrete Metrics
| Metric | Units | Description | Column Name |
|---|---|---|---|
| Kinematic Sequence | N/A | Order (timing) of peak segment angular velocties [‘pelvis-trunk’, ‘trunk-pelvis’]. Correct order is ‘pelvis-trunk’. | “ |
| Sway | bool | Whether the golfer exhibits a sway fault, indicated by shifting the pelvis laterally (side-side displacement) more than 15 cm (~6 in) in the 2 s leading up to ball contact. | “ |
| Max Stretch | degrees | Returns the maximum amount of hip shoulder separation (aka X Factor) | “ |
| Peak Pelvis Velocity | degrees/s | Max angular velocity of the pelvis about the twist axis (like a tornado) during the swing. | “ |
| Peak Trunk Velocity | degrees/s | Max angular velocity of the trunk about the twist axis (like a tornado) during the swing. | “ |
| Hip Angle | degrees | Pelvis segment (defined by the hip joint centers) rotation angle about the twist axis relative to the first frame. | “ |
| Shoulder Angle | degrees | Trunk segment (defined by the shoulder joint centers) rotation angle about the twist axis relative to the first frame. | “ |
Notes
- Kinematic data typically captured at 240Hz for Golf Swing