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- Title
Endurance Training with or without Glucose-Fructose Ingestion: Effects on Lactate Metabolism Assessed in a Randomized Clinical Trial on Sedentary Men.
- Authors
Rosset, Robin; Lecoultre, Virgile; Egli, Léonie; Cros, Jérémy; Rey, Valentine; Stefanoni, Nathalie; Sauvinet, Valérie; Laville, Martine; Schneiter, Philippe; Tappy, Luc
- Abstract
Glucose-fructose ingestion increases glucose and lactate oxidation during exercise. We hypothesized that training with glucose-fructose would induce key adaptations in lactate metabolism. Two groups of eight sedentary males were endurance-trained for three weeks while ingesting either glucose-fructose (GF) or water (C). Effects of glucose-fructose on lactate appearance, oxidation, and clearance were measured at rest and during exercise, pre-training, and post-training. Pre-training, resting lactate appearance was 3.6 ± 0.5 vs. 3.6 ± 0.4 mg±kg±1±min±1 in GF and C, and was increased to 11.2 ± 1.4 vs. 8.8 ± 0.7 mg⋅kg-1⋅min-1 by exercise (Exercise: p < 0.01). Lactate oxidation represented 20.6 ± 1.0% and 17.5 ± 1.7% of lactate appearance at rest, and 86.3 ± 3.8% and 86.8 ± 6.6% during exercise (Exercise: p < 0.01) in GF and C, respectively. Training with GF increased resting lactate appearance and oxidation (Training ± Intervention: both p < 0.05), but not during exercise (Training x Intervention: both p > 0.05). Training with GF and C had similar effects to increase lactate clearance during exercise (+15.5 ± 9.2 and +10.1 ± 5.9 mL⋅;kg-1⋅min-1; Training: p < 0.01; Training x Intervention: p = 0.97). The findings of this study show that in sedentary participants, glucose-fructose ingestion leads to high systemic lactate appearance, most of which is disposed non-oxidatively at rest and is oxidized during exercise. Training with or without glucose-fructose increases lactate clearance, without altering lactate appearance and oxidation during exercise.
- Publication
Nutrients, 2017, Vol 9, Issue 4, p411
- ISSN
2072-6643
- Publication type
Article
- DOI
10.3390/nu9040411