Rehrer N J, Brouns F, Beckers E J, ten Hoor F, Saris W H
University of Limburg, Dept. of Human Biology, Maastricht, The Netherlands.
Int J Sports Med. 1990 Jun;11(3):238-43. doi: 10.1055/s-2007-1024799.
The high prevalence of gastrointestinal complaints in long-distance runners makes the movements specific to this type of exercise suspected of causing a disruption of normal gastrointestinal function. Gastric emptying rate is one indicator thereof. In the present study trained volunteers performed similar repeated fluid ingestion tests while running and while bicycling for 80 min at 70% VO2max. Control tests at rest were also conducted. Two drinks containing carbohydrate were tested, one hypertonic, and one isotonic. Artificially sweetened water was used as a control. Gastric emptying rate of the isotonic drink, expressed as a percentage of the volume in the stomach at the beginning of each measurement period, did not differ between cycling and running during the first 40 min and was faster during cycling than during running between 40 and 80 min. With the hypertonic drink no differences between cycling and running were observed. In comparing gastric emptying rates after each sequential bolus, at rest, the isotonic drink was observed to maintain a high emptying rate, equal to that of water, whereas the hypertonic drink emptied more slowly after the first 20-min period. A similar pattern was observed during both running and cycling. The isotonic drink continued to empty quickly after the initial 20 min, whereas GE rate of the hypertonic drink decreased after the initial 20 min.
长跑运动员胃肠道不适的高发生率使得人们怀疑这类运动特有的动作会导致正常胃肠功能紊乱。胃排空率就是其中一项指标。在本研究中，训练有素的志愿者在以70%最大摄氧量跑步和骑行80分钟时进行了类似的重复液体摄入测试。同时也进行了静息对照测试。测试了两种含碳水化合物的饮料，一种是高渗饮料，一种是等渗饮料。人工甜味水用作对照。等渗饮料的胃排空率，以每个测量期开始时胃内体积的百分比表示，在前40分钟内骑行和跑步之间没有差异，在40至80分钟之间骑行时比跑步时更快。对于高渗饮料，未观察到骑行和跑步之间的差异。在比较每次连续推注后的胃排空率时，静息状态下，观察到等渗饮料保持较高的排空率，与水的排空率相当，而高渗饮料在最初20分钟后排空得更慢。在跑步和骑行过程中都观察到了类似的模式。等渗饮料在最初20分钟后继续迅速排空，而高渗饮料的胃排空率在最初20分钟后下降。
