| Effects of dietary L-arginine intake on cardiorespiratory and metabolic adaptation in athletes. | |
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MedLine Citation:
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PMID: 19827461 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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To assess the effect of diet enrichment with L-arginine or supplementation at high doses on physiological adaptation during exercise, 9 athletes followed 3 different diets, each over 3 consecutive days, with a wash-out period of 4 d between training sessions: control diet (CD), 5.5 +/- 0.3 g/d of L-arginine; Diet 1 (rich in L-arginine food), 9.0 +/- 1.1 g/d of L-arginine; and Diet 2 (the same as CD but including an oral supplement of 15 g/d), 20.5 +/- 0.3 g/d of L-arginine. Plasma nitrate levels of each participant were determined on the day after each treatment. Participants performed a submaximal treadmill test (initial speed 10-11 km/hr, work increments 1 km/hr every 4 min until 85-90% VO2max, and passive recovery periods of 2 min). Oxygen uptake and heart rate were monitored throughout the test. Blood lactate concentration ([La-]b) was determined at the end of each stage. Repeated-measures ANOVA and paired Student's t tests were used to compare the various physiological parameters between diets. The level of significance was set at p < .05. [La-]b showed a significant effect at the 5-min time point between CD and Diet 2 (CD 3.0 +/- 0.5 mM, Diet 2 2.5 +/- 0.5 mM, p = .03), but this tendency was not found at higher exercise intensities. No significant differences were observed in any of the cardiorespiratory or plasma nitrate levels. In conclusion, dietary L-arginine intake on the days preceding the test does not improve physiological parameters during exercise. |
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Authors:
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Raul Bescós; Carlos Gonzalez-Haro; Pere Pujol; Franchek Drobnic; Eulalia Alonso; Maria Luisa Santolaria; Olga Ruiz; Marc Esteve; Pedro Galilea |
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: International journal of sport nutrition and exercise metabolism Volume: 19 ISSN: 1526-484X ISO Abbreviation: Int J Sport Nutr Exerc Metab Publication Date: 2009 Aug |
Date Detail:
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Created Date: 2009-10-15 Completed Date: 2009-11-17 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100939812 Medline TA: Int J Sport Nutr Exerc Metab Country: United States |
Other Details:
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Languages: eng Pagination: 355-65 Citation Subset: IM |
Affiliation:
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Physiology Laboratory, National Institute of Physical Education, Barcelona, Spain. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adaptation, Physiological
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drug effects*,
physiology Adolescent Analysis of Variance Arginine / administration & dosage, metabolism, pharmacology* Cross-Over Studies Dietary Supplements Exercise Test Food, Fortified Heart Rate / drug effects*, physiology Humans Lactic Acid / blood* Male Nitrates / blood* Oxygen Consumption / drug effects*, physiology |
| Chemical | |
Reg. No./Substance:
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0/Nitrates; 50-21-5/Lactic Acid; 74-79-3/Arginine |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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