Chronophysiological mechanism of the circadian rhythm Regularity of the intestine evacuation function

Abstract

We studied association of the regularity and acrophase of the intestine’s circadian rhythm in survey of 356 medical students. Subjects were divided to groups with regular stool rhythm (euenteria - 7 times per week) and irregular rhythm (bradienteria - 1-6 times per week). Four variants of the intestine acrophase (evacuation time) were determined for 4 periods of the day: morning, afternoon, evening, night. It was shown that subjects with euenteria had morning acrophase of intestine 2 times more frequent than its absence. The absence of morning acrophase occurred 3 times more often than its presence. The regularity of the defecation rhythm depends on presence of the morning acrophase of this rhythm, and irregular rhythm is associated with the absence of the morning acrophase of the bowel movement. The “exellent” level of wellbeing, activity and mood in students with euenteria was higher than in students with bradyenteria.