While the reach pattern is being performed,the scapula protracts and rotates upward by the combination actions of the serratus anterior andupper and lower trapezius muscles.

• 在伸手模式进行时，下肢及身体的躯干会保持收缩来稳住身体，同时，视身体位置而定，身体重心也可能会转向书架来协助动作进行。