Circadian rhythm of rectal reactivity in individuals with regular and irregular bowel evacuation function

Circadian dynamics of rectal reactivity was studied in humans with regular and irregular rhythms of bowel evacuation function by chronoenterography. In individuals with regular rhythm of this function (stool 7 days per week) the acrophase of circadian rhythm of rectal reactivity was observed in morning hours, while in the daytime and evening and this parameter decreased almost 7-fold. In subjects with bowel arrhythmia (3-6 days with stool per week) rectal reactivity was inversed: 2-fold decreased in the morning and 3-fold increased in the evening.