Effect of coffee on motor and sensory function of proximal stomach.

Some people attribute dyspeptic symptoms to drinking coffee, suggesting that coffee affects one or more functions of the proximal gastrointestinal tract. In a randomized controlled, cross-over, single-blinded study, the effects of coffee on gastric relaxation, gastric wall compliance and sensations, elicited by distension, were investigated in 10 healthy volunteers. Using the barostat technique, volume changes of an intragastric bag were recorded for 20 min after intragastric administration of 280 ml of coffee or water. Then, after deflation, the volume of the bag was increased stepwise every 3 min to assess gastric wall compliance and wall tension. At the end of every volume step, sensations (nausea, pain, and bloating) were scored. During the first 20 min after coffee administration, the volume change of the intragastric bag was larger than after water (P < 0.05). There were no differences in gastric wall compliance, wall tension, or symptom scores. In conclusions, coffee, in comparison with water, enhances the adaptive relaxation of the proximal stomach, but has no effect on its wall compliance, wall tension, or sensory function.