title: Absorption from different intestinal segments during exercise.
abstract: This study evaluated intestinal absorption from the first 75 cm of the proximal small intestine during 85 min of cycle exercise [63.6 +/- 0.7% peak O2 consumption (VO2 peak)] while subjects ingested either an isotonic carbohydrate-electrolyte beverage (CHO-E) or a water placebo (WP). The CHO-E beverage contained 117 mM (4%) sucrose, 111 mM (2%) glucose, 18 meq Na+, and 3 meq K+. The two experiments were performed a week apart by seven subjects (6 men and 1 woman; mean VO2 peak = 53.5 +/- 6.5 ml . kg-1 . min-1). Nasogastric and multilumen tubes were fluoroscopically positioned in the gastric antrum and duodenojejunum, respectively. Subjects ingested 23 ml/kg body weight of the test solution, 20% (383 +/- 11 ml) of this volume 5 min before exercise and 10% (191 +/- 5 ml) every 10 min thereafter. By using the rate of gastric emptying (18.1 +/- 1.1 vs. 19.2 +/- 0. 7 ml/min for WP and CHO-E, respectively) as the rate of intestinal perfusion, intestinal absorption was determined by segmental perfusion from the duodenum (0-25 cm) and jejunum (25-50 and 50-75 cm). Water flux was different (P < 0.05) between solutions in the 0- to 25- and 25- to 50-cm segments for WP vs. CHO-E (30.7 +/- 2.7 vs. 15.0 +/- 2.9 and 3.8 +/- 1.1 vs. 11.9 +/- 3.3 ml . cm-1 . h-1, respectively). Furthermore, water flux differed (P < 0.05) for WP in a comparison of the 0- to 25- to the 25- to 50-cm segment. Total solute flux (TSF) was not significantly different among segments for a given solution or between solutions for a given segment. There was no difference between trials for percent change in plasma volume. These results indicate that 1) fluid absorption in the proximal small intestine depends on the segment studied and 2) solution composition can significantly effect water absorption rate in different intestinal segments.
authors.affiliation: Department of Exercise Science, University of Iowa, Iowa City, Iowa 52242-1111, USA.
authors.forename: G P
authors.initials: GP
authors.lastname: Lambert
authors.forename: R T
authors.initials: RT
authors.lastname: Chang
authors.forename: T
authors.initials: T
authors.lastname: Xia
authors.forename: R W
authors.initials: RW
authors.lastname: Summers
authors.forename: C V
authors.initials: CV
authors.lastname: Gisolfi
mesh_terms: D000328:Adult; D050260:Carbohydrate Metabolism; D004032:Diet; D004386:Duodenum / Q000378:metabolism; D015444:Exercise / Q000502:physiology*; D005260:Female; D005746:Gastric Emptying / Q000502:physiology; D005753:Gastric Mucosa / Q000378:metabolism; D006801:Humans; D007408:Intestinal Absorption / Q000502:physiology*; D008297:Male; D009994:Osmolar Concentration; D010101:Oxygen Consumption / Q000502:physiology; D011188:Potassium / Q000378:metabolism; D012964:Sodium / Q000378:metabolism; D014867:Water / Q000378:metabolism
chemical_list: D014867:Water; D012964:Sodium; D011188:Potassium