Influence of gastric motility on sleep bruxism

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Based on the hypothesis that gastric motility is related with bruxism that shows mastication-like movement, we conducted a randomized trial to compare the effects of mastication on gastric emptying and gastric myoelectrical activity under conditions that excluded the influences of food comminution, taste, and olfaction using^<13> C-acetate breath test in 14 healthy men who ingested a test meal with or without chewing gum. Gastric emptying was significantly delayed in the ingestion. Gastric myoelectrical activity was significantly suppressed during mastication and increased gradually in the post-mastication phase. A decrease in the high-frequency power of heart rate variability occurred coincidentally with gastric myoelectrical activity suppression. These findings suggest that initial gastric emptying is suppressed by mastication and that the suppression is caused by mastication-induced inhibition of gastric activity and a possibility that gastric motility is closely related with bruxism.