Abstract
A simple, noninvasive radiographic method was used to investigate the influence of food and of marker length on gastric emptying of indigestible solids. Ten healthy human subjects who had fasted for 12 h exhibited more rapid emptying when solid radiopaque markers were ingested with water than they did when markers were ingested with a 400- kcal solid and liquid meal. Mean (±SE) emptying of markers that were 10 mm in length averaged 55% ± 15%, 97% ± 3%, and 100% 1, 2, and 4 h after ingestion of the markers with water, compared with 4% ± 2%, 32% ± 11%, and 64% ± 12% emptying 1, 2, and 4 h after ingestion of markers with the meal (p < 0.05). Ingestion of a second and third test meal significantly prolonged gastric emptying of indigestible markers (p < 0.05). No significant difference in emptying of the 10- and 2-mm markers from the stomach was detected. These experiments indicate that gastric emptying of indigestible solids in humans is strongly influenced by food intake, but not by the particle lengths studied.
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