PMID: 2496077Feb 1, 1989Paper

Effects of acute exercise and detraining on insulin action in trained men

Journal of Applied Physiology
K J MikinesH Galbo

Abstract

Seven endurance-trained subjects [maximal O2 consumption (VO2max) 64 +/- 1 (SE) ml.min-1.kg-1] underwent sequential hyperinsulinemic euglycemic clamps on three occasions: 1) in the "habitual state" 15 h after the last training bout (C), 2) after 60 min of bicycle exercise at 72 +/- 3% of VO2max performed in the habitual state (E), and 3) 5 days after the last ordinary training session (detrained, DT). Sensitivity for insulin-mediated whole-body glucose uptake was not affected by acute exercise [insulin concentrations eliciting 50% of maximal insulin-mediated glucose uptake being 44 +/- 2 (C) vs. 46 +/- 3 (E) microU/ml] but was decreased after detraining (54 +/- 2 microU/ml, P less than 0.05) to levels comparable to those found in untrained subjects [Am. J. Physiol. 254 (Endocrinol. Metab. 17): E248-E259, 1988]. Near-maximal insulin-mediated glucose uptake (responsiveness) was higher than in untrained subjects and not influenced by acute exercise or detraining [13.4 +/- 1.2 (C), 12.2 +/- 0.9 (E), and 12.2 +/- 0.3 (DT) mg.min-1.kg-1]. Calculated by indirect calorimetry, the glucose-to-glycogen conversion was not influenced by E but was reduced during detraining (P less than 0.05) yet remained higher than previously found in untra...Continue Reading

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