Effect of exercise intensity on active and passive glucose absorption

James A. Lang, Carl V. Gisolfi, G. Patrick Lambert

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

The purpose of this study was to determine the effects of exercise intensity on active and passive intestinal glucose absorption. Eight trained runners (age = 23 ± 2 y; VO2max = 62.1 ± 5.8 mL·kg-1·min-1) performed a 1 h resting experiment and three 1 h treadmill experiments at 30, 50, or 70% VO 2max in a thermoneutral environment. Immediately prior to each experiment, euhydrated subjects ingested a solution containing two non-metabolizable glucose analogs, 3-O-methyl-D-glucose (3MG; actively absorbed; 5 g) and D-xylose (passively absorbed; 5 g). During the following 5 h, all urine was collected and the amount of 3MG and D-xylose in the urine was determined. Using repeated measures ANOVA, a significant (P < 0.05) reduction in urinary excretion of each carbohydrate was observed at 70% VO2max compared to the other intensities suggesting that both active and passive intestinal absorption of glucose may be reduced during prolonged running at this intensity.

Original languageEnglish (US)
Pages (from-to)485-493
Number of pages9
JournalInternational Journal of Sport Nutrition and Exercise Metabolism
Volume16
Issue number5
DOIs
StatePublished - Jan 1 2006

All Science Journal Classification (ASJC) codes

  • Medicine (miscellaneous)
  • Orthopedics and Sports Medicine
  • Nutrition and Dietetics

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