Methods The visceromotor responses ( VMR ) evoked by repeated colorectal distention ( CRD ) were monitored in lightly anesthetized adult female rats .

方法采用成年雌性大鼠，在浅麻醉 状态下 记录 充胀 直肠（CRD）引起的 腹肌 放电 活动，即 内脏 运动反应（VMR）；