| The Acute Effects of L-arginine on Hormonal and Metabolic Responses During Submaximal Exercise in Trained Cyclists. | |
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MedLine Citation:
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PMID: 23319437 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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L-arginine may enhance endurance performance mediated by two primary mechanisms including enhanced secretion of endogenous growth hormone (GH) and as a precursor of nitric oxide (NO); however, research in trained participants has been equivocal. The purpose was to investigate the effect of acute L-arginine ingestion on the hormonal and metabolic response during submaximal exercise in trained cyclists. Fifteen aerobically trained men (age: 28 ± 5 y; body mass: 77.4 ± 9.5 kg; height: 180.9 ± 7.9 cm; VO2max : 59.6 ± 5.9 ml·kg-1·min-1) participated in a randomized, double blind, crossover study. Subjects consumed L-arginine (ARG; 0.075 g·kg-1 body mass) or a placebo (PLA) prior to performing an acute bout of submaximal exercise (60 min at 80% of power output achieved at ventilatory threshold). The ARG condition significantly increased plasma L-arginine concentrations (~146%) while no change was detected in the PLA condition. There were no differences between conditions for GH, non-esterified fatty acids (NEFA), lactate, glucose, VO2, VCO2, RER, CHO oxidation, and NOx. There was reduced fat oxidation at the start of exercise (ARG: 0.36 ± 0.25 vs. PLA: 0.42 ± 0.23 g·min-1, p<0.05) and an elevated plasma glycerol concentrations at the 45 min time point (ARG: 340.3 vs. PLA: 288.5 μmol·L-1, p<0.05) after L-arginine consumption. In conclusion, the acute ingestion of L-arginine did not alter any hormonal, metabolic, or cardio-respiratory responses during submaximal exercise except for a small but significant increase in glycerol at the 45 min time point and a reduction in fat oxidation at the start of exercise. |
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Authors:
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Scott C Forbes; Vicki Harber; Gordon J Bell |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2013-1-8 |
Journal Detail:
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Title: International journal of sport nutrition and exercise metabolism Volume: - ISSN: 1543-2742 ISO Abbreviation: Int J Sport Nutr Exerc Metab Publication Date: 2013 Jan |
Date Detail:
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Created Date: 2013-1-15 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100939812 Medline TA: Int J Sport Nutr Exerc Metab Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Faculty of Physical Education & Recreation, University of Alberta, Edmonton, Alberta, Canada. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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