This setup allowed complex loading, beginning from flexion and passing into lateral bending to the right, then into extension and into lateral bending to the left, and starting again in flexion.

• 这一装置允许加载复合负荷，开始时为屈曲，然后变为向右侧弯，接着是伸展并向左侧弯，然后又开始屈曲。