Abstract des Autors

This study examined the rates of gastric emptying for water and 13 different carbohydrate-containing solutions in seven subjects, using conventional gastric intubation techniques. The rates of gastric emptying for water and a 10 glucose-polymer solution were also measured during 90 min of treadmill running at 75 of each subjects maximum oxygen consumption (VO2 max). At rest, 15 glucose-polymer (P) and fructose (F) solutions emptied more rapidly from the stomach and provided a faster rate of carbohydrate delivery than did a 15 glucose (G) solution. The G solutions showed a constant energy delivery rate of 3.3 kcal/min; energy delivery from P and F solutions rose with increasing solution concentrations. The osmolality of the gastric aspirate predicted the rate of gastric emptying for all solutions but overestimated rates of emptying for 10 and 15 P solutions and underestimated emptying rates for 10 and 15 F solutions. Exercise at 75 VO2 max decreased the rate of gastric emptying of water but not of 10 P solutions. Thus the different rates of gastric emptying for different carhohydrate-containing solutions were not entirely explained by differences in osmolality. Furthermore, exercise may have different effects on the gastric emptying rates of water and carbohydrate solutions.