Table 1 A description of how swing kinematic variables were determined
| Â | Definitions |
|---|---|
Transition | Is determined as the point of lowest angular velocity for a segment, between initiation of the backswing and impact. |
X-factor | The change in amplitude of spinal rotation (difference between thorax and pelvis rotation) at pelvis transition |
X-factor stretch | The maximum increase in X-factor during the downswing |
X-factor stretch rate | The average speed of X-factor stretch |
Shoulder stretch | The change in amplitude of lead arm horizontal adduction between thorax transition and lead arm transition |
Shoulder stretch rate | The average speed of shoulder stretch |
Pelvis acceleration | The average acceleration of the pelvis between pelvis transition and pelvis peak speed |
Thorax acceleration | The average acceleration of the thorax between thorax transition and peak thorax speed |
Lead arm acceleration | The average acceleration of the lead arm between lead arm transition and lead arm peak speed, measured around the local Z-axis at the shoulder joint |