Women had slower gastric emptying rates than men according to a study of 20 men and 40 women. Premenopausal women, postmenopausal women, and postmenopausal women taking oral estrogen had slower gastric emptying than men. The antrum is the part of the stomach located near the entrance to the small bowel. Antral motility was measured during this study, and there was no difference between men and women.
Influence of gender and menopause on gastric emptying and motility.
Hutson WR, Roehrkasse RL, and Wald A. Gastroenterology. 1989 Jan;96(1):11-7.
A seperate study compared premenopausal women to age matched men. Their rate to empty half their gastric contents was thirty minutes longer than men. Dynamic antral scintigraphy uses nuclear medicine to measure to contractions in the antrum. Using this technique, the contractility of the mid-antrum was shown to be significantly lower in women.
Knight LC, Parkman HP, Brown KL, Miller MA, Trate DM, Maurer AH, and Fisher RS. Delayed gastric emptying and decreased antral contractility in normal premenopausal women compared with men. Am J Gastroenterol. 1997 Jun;92(6):968-75.