We investigated in conscious dogs the effects of intravenously administered 5-hydroxytryptophan (5-HTP) and cisapride on the postprandial jejunal mechanical activity by means of six closely spaced extraluminal strain gauge transducers. Drugs were given after administration of a nutrient meal. 5-HTP was given additionally after the administration of a noncaloric cellulose meal. Computer assistance was used to determine the temporal and spatial relationship of contractions and thereby to evaluate the length of spread of contractile waves. Both substances increased the propulsive activity, the contractile force and the motility index and fastened the transit rate of digesta. 5-HTP exhibited the most potent effect when given after administration of the nutrient meal.

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