| Pre-exercise intake of different carbohydrates modifies ischemic reactive hyperemia after a session of anaerobic, but not after aerobic exercise. | |
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MedLine Citation:
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PMID: 20508468 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The acute ingestion of a supplement with different glycemic carbohydrates, including fructose, is a typical practice for athletes before exercising. Observational evidence suggests that different metabolic responses may modify the exercise-stimulated endothelium-dependent vasodilation. The purpose of the present study was to investigate whether endothelial reactivity, stimulated by anaerobic exercise (AnE) or aerobic exercise (AE), both performed with glycemic supplementation, is modified by the addition of fructose. Twenty physically trained men ingested an oral dose of glucose (G) or glucose plus fructose (F) 15 minutes before starting a 30-minute session of AnE (10 sets of 10 repetitions of half squat) or AE (cycling). The combination resulted in 4 randomized interventions in a crossover design in which all subjects performed all experimental conditions: G+AnE, F+AnE, G+AE, and F+AE. Ischemic reactive hyperemia (IRH), glycemia, plasma lipoperoxides (LPOs), nitric oxide (NO), and lactate were determined at baseline, exercise, and acute recovery time points. Immediately after AnE, IRH was 26.35% higher in F+AnE than in G+AnE (p<0.05); this difference rose to 27.24% at the end of the recovery period (p<0.05). The glycemic peak in F+AnE was lower than in G+AnE (p<0.05), and there was a second peak during recovery (p<0.05). There were no differences observed in LPO between anaerobic trials, but the NO bioavailability increased and was higher in F + AnE than in G+AnE after exercise and recovery (p<0.05). Residual lactate was also higher under the F+AnE condition (p<0.05). During AE, there were no differences in IRH, glycemia, or NO between groups, but LPO was significantly higher after F supplementation. These results suggest that the addition of fructose to a single G supplement ingested before a glycolitic exercise can modify the glucoregulation and increases ischemic reactive hyperemia. |
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Authors:
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Juan M Fernández; Marzo E Da Silva-Grigoletto; Javier Caballero-Villarraso; José R Gómez-Puerto; Bernardo H Viana-Montaner; Inmaculada Tasset-Cuevas; Isaac Túnez-Fiñana; Pablo Pérez-Martínez; José López-Miranda; Francisco Pérez-Jiménez |
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Publication Detail:
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Type: Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of strength and conditioning research / National Strength & Conditioning Association Volume: 24 ISSN: 1533-4287 ISO Abbreviation: J Strength Cond Res Publication Date: 2010 Jun |
Date Detail:
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Created Date: 2010-05-28 Completed Date: 2010-09-14 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9415084 Medline TA: J Strength Cond Res Country: United States |
Other Details:
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Languages: eng Pagination: 1623-32 Citation Subset: IM |
Affiliation:
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Lipids and Atherosclerosis Research Unit, Reina Sofía University Hospital, Córdoba, CIBER Physiopathology of the Obesity and Nutrition (CIBEROBN), and Andalusian Center of Sports Medicine, Department of Biochemistry and Molecular Biology, School of Medicine, University of Córdoba, Córdoba, Spain. juf_nutryinves@yahoo.com |
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Anaerobic Threshold / drug effects*, physiology Athletes Blood Glucose / analysis Dietary Carbohydrates / administration & dosage* Dietary Supplements Endothelium, Vascular / drug effects*, physiology Exercise / physiology* Fructose / administration & dosage* Glucose / administration & dosage* Glycolysis Humans Insulin / blood Lactic Acid / blood Lipid Peroxides / blood Male Nitric Oxide / blood Vasodilation / physiology* |
| Chemical | |
Reg. No./Substance:
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0/Blood Glucose; 0/Dietary Carbohydrates; 0/Lipid Peroxides; 10102-43-9/Nitric Oxide; 11061-68-0/Insulin; 30237-26-4/Fructose; 50-21-5/Lactic Acid; 50-99-7/Glucose |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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