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Modulation of the duration of human postprandial motor activity by sleep.

We have measured the effect of the presence of food in the gastrointestinal tract on proximal small bowel motility during sleep. Motility was measured in eight healthy ambulant subjects using two strain-gauge microtransducers incorporated in a fine (2.5 mm OD) nasojejunal tube. The subjects ate a 540-cal evening meal (EM) on the first day. On the following day they ate an equicaloric meal (with similar proportion of carbohydrates, proteins, and fats) at lunch time (MM) and then another equicaloric late meal (LM) 15 min before going to bed. All subjects were asleep within 30 min of completing the LM. Postprandial activity was significantly (P less than 0.001) shortened after LM, but there was no difference in the postprandial motor activity after MM and EM. Migrating motor complex (MMC) cycle lengths were similar after MM, EM, and LM. There was no difference in the duration of phase II of the MMC cycle after MM, EM, and LM even though subjects were asleep during the MMC cycles after LM. The MMC propagation velocity after LM and EM was significantly (P less than 0.01, P less than 0.001, respectively) slower than the diurnal MMC propagation velocity after MM. In health, postprandial activity is diminished during sleep, whereas the consumption of a LM restores the phase II activity usually absent during sleep. A LM also abolishes the expected reduction in nocturnal MMC cycle length but maintains the circadian variation in the propagation velocity of the MMC cycle.