Abstract
Electrogastrography (EGG) is a method for recording gastric myoelectrical activity using cutaneous electrodes from the abdominal surface. To investigate the effects of water temperature and volume on gastric myoelectrical activity, we performed three tests in a randomized parallel design, using the following samples: 15°C/250 mL (Cold250), 65°C/250 mL (Hot250), and 65°C/150 mL (Hot150) in 27 young women at 9 a.m. after an overnight fast. EGG recordings were made before (20 min) and after (35 min) ingestion to determine the frequency and power ratio of normogastria with the band set at around 3 cycles per min. The frequency of normogastria was transiently increased after ingestion of Hot250, but temporarily decreased after Cold250, showing significantly different changes in time courses. No difference in the frequency of normogastria was evident between Hot250 and Hot150. The power ratio of normogastria was equally increased after ingestion of all samples. Our results suggest that hot water (65°C, >150 mL) can increase the frequency of the normal range of gastric motility; moreover, its power was transiently increased after water ingestion, regardless of temperature and volume.
