Defecation requires relaxation of the internal and external anal sphincters. High anal resting pressure is associated with painful constipation, defecatory disorders, and increased healthcare utilization in constipated patients; the mechanisms are unclear. Perhaps patients with a high anal resting pressure have a less distensible canal, which impedes defecation.

中文翻译：

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一种使用恒压器和磁共振成像评估健康和便秘女性肛门扩张性的新方法

排便需要放松肛门内外括约肌。高肛门静息压力与便秘患者疼痛性便秘、排便障碍和医疗保健利用率增加有关；机制尚不清楚。可能肛门静息压高的患者肛门扩张较少，这会阻碍排便。