title: Exercise induces gastric ischemia in healthy volunteers: a tonometry study.
abstract: Heavy physical exercise may cause gastrointestinal signs and symptoms, and, although splanchnic blood flow may decrease through redistribution by more than 50%, it is unclear whether these signs and symptoms relate to gastrointestinal ischemia. In 10 healthy volunteers, we studied the effect of exercise on gastric mucosal perfusion adequacy using air tonometry. Two relatively short (10 min) exercise stages were conducted on a cycle ergometer, aiming for 80 and 100% of maximum heart rate, respectively. The intragastric-arterial PCO(2) gradient (Delta PCO(2)) was elevated by 1.1 +/- 1.0 kPa over baseline values (-0.1 +/- 0.3 kPa) only after maximal exercise (P < 0.001). Delta PCO(2) positively correlated with the arterial lactate level taken as an index of exercise intensity (Spearman's rank test: r = 0.76, P < 0.0001). By bilinear regression analysis, a lactate level of 12 mmol/l, above which a sharp rise in the Delta PCO(2) occurred, was calculated. We conclude that, in healthy volunteers with normal splanchnic vasculature, gastric ischemia may develop during maximal exercise as judged from intragastric PCO(2) tonometry.
authors.affiliation: Department of Internal Medicine and Gastroenterology, Medisch Spectrum Twente, Enschede, The Netherlands.
authors.forename: J A
authors.initials: JA
authors.lastname: Otte
authors.forename: E
authors.initials: E
authors.lastname: Oostveen
authors.forename: R H
authors.initials: RH
authors.lastname: Geelkerken
authors.forename: A B
authors.initials: AB
authors.lastname: Groeneveld
authors.forename: J J
authors.initials: JJ
authors.lastname: Kolkman
mesh_terms: D000328:Adult; D002245:Carbon Dioxide / Q000097:blood / Q000378:metabolism; D015444:Exercise / Q000502:physiology*; D005260:Female; D005753:Gastric Mucosa / Q000098:blood supply*; D006339:Heart Rate; D006801:Humans; D007511:Ischemia; D007773:Lactates / Q000097:blood; D008297:Male; D008365:Manometry / Q000379:methods; D010313:Partial Pressure; D005082:Physical Exertion / Q000502:physiology*; D012016:Reference Values; D012044:Regression Analysis; D015656:Respiratory Mechanics / Q000502:physiology; D012146:Rest; D013152:Splanchnic Circulation; D013270:Stomach / Q000098:blood supply*; D013997:Time Factors
chemical_list: D007773:Lactates; D002245:Carbon Dioxide