Lupton J R, Morin J L, Robinson M C
Graduate Faculty of Nutrition, Texas A&M University, College Station 77843.
J Am Diet Assoc. 1993 Aug;93(8):881-5. doi: 10.1016/0002-8223(93)91526-v.
The effect of barley bran flour on colon physiology was studied in 44 volunteers. Twenty-two subjects followed the National Cholesterol Education Program (NCEP) step 1 diet supplemented with 20 g cellulose and the other 22 followed the NCEP diet supplemented with 30 g barley bran flour. To measure gastrointestinal transit time, subjects ingested 20 polyethylene pellets impregnated with barium sulfate in two gelatin capsules. Subjects collected fecal samples for 5 days during the baseline period and again during the period of fiber supplementation. Each stool sample was radiographed, and the number of recovered markers was used to calculate mean transit time. Daily fecal weights were recorded and dry weights were determined. The group that consumed barley bran flour significantly decreased transit time by 8.02 hours from baseline, whereas the group that consumed cellulose increased transit time by 2.95 hours from baseline. Similarly, cellulose supplementation did not result in increased fecal weight, whereas daily fecal weight increased significantly by 48.6 g with supplementation with barley bran flour. This study shows that barley bran flour accelerates gastrointestinal transit and increases fecal weight.
在44名志愿者中研究了大麦麸粉对结肠生理的影响。22名受试者遵循美国国家胆固醇教育计划（NCEP）第一步饮食方案，并补充20克纤维素，另外22名受试者遵循NCEP饮食方案，并补充30克大麦麸粉。为了测量胃肠通过时间，受试者在两个明胶胶囊中摄入20颗浸渍有硫酸钡的聚乙烯小球。受试者在基线期收集5天的粪便样本，并在补充纤维期间再次收集。对每个粪便样本进行X光检查，并使用回收标志物的数量来计算平均通过时间。记录每日粪便重量并测定干重。食用大麦麸粉的组从基线起显著减少通过时间8.02小时，而食用纤维素的组从基线起增加通过时间2.95小时。同样，补充纤维素并未导致粪便重量增加，而补充大麦麸粉后每日粪便重量显著增加48.6克。这项研究表明，大麦麸粉可加速胃肠通过并增加粪便重量。
