We previously reported that ingestion of 60 mL of red wine or vodka prior to the ingestion of a pancake significantly inhibited the gastric emptying of the pancake in male subjects, but not in female subjects, and that the retention times of wine and vodka were significantly longer than those of the congener of red wine and mineral water in male subjects, whereas in female subjects the retention times of these four drinks did not differ significantly from one another. We hypothesized that the menstrual cycle may influence the gastric emptying of alcohol beverages. Here, we determined and compared the retention times of vodka and water in the stomach during the luteal phase and the follicular phase. Ten female healthy volunteers were studied. They recorded their basal body temperatures every day, and participated in the following experiments: each volunteer drank mineral water or vodka containing 14% alcohol (60 mL) during the low-temperature (follicular) phase as well as during the high-temperature (luteal) phase. The retention time of vodka was significantly longer than that of mineral water during the follicular phase, but no significant differences between the retention times of the two drinks were observed during the luteal phase. In conclusion, the menstrual cycle influences the gastric emptying rate of alcohol.Several studies (8,9,13,15) showed that alcohol consumption delayed the gastric emptying of meals in healthy male subjects, but these studies did not examine female subjects. We (1) observed that the ingestion of 60 mL of red wine or vodka prior to a pancake meal, significantly inhibited the gastric emptying of the pancake in male subjects, but not in female subjects. We later determined the retention times of vodka, red wine, the congener (a non-alcoholic component) of red wine, and mineral water (all 60 mL) in the stomach, and we (24) found that the retention times of wine and vodka were significantly longer than those of the congener and mineral water in the male subjects, but the retention time of these four beverages did not differ significantly from one another in the female subjects. Regarding the reason(s) why the alcohol beverages did not have elongated retention times in the stomachs of female subjects as they did in males, we hypothesized that the menstrual cycle may influence the gastric emptying rate of alcohol beverages. Although several studies (4,6,12,14) have assessed the effect of the menstrual cycle on gastric emptying, the results are conflicting; moreover, the effects of alcohol beverages on gastric emptying were not examined in those studies. In the present study, we determined and compared the retention times of vodka and water in the stomach during the luteal phase and the follicular phase.
MATERIALS AND METHODSThis human study was approved by the Ethics Committee of Tokyo Kasei University. All participants provided their written informed consent.