| &OV0312;o2max and ventilatory threshold of trained cyclists are not affected by 28-day l-arginine supplementation. | |
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MedLine Citation:
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PMID: 20581700 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Sunderland, KL, Greer, F, and Morales, J. &OV0312;o2max and ventilatory threshold of trained cyclists are not affected by 28-day l-arginine supplementation. J Strength Cond Res 25(3): 833-837, 2011-The ergogenic effect of l-arginine on an endurance-trained population is not well studied. The few studies that have investigated l-arginine on this population have not been conducted in a laboratory setting or measured aerobic variables. The purpose of the current study is to determine if 28 days of l-arginine supplementation in trained male cyclists affects &OV0312;o2max and ventilatory threshold (VT). Eighteen () endurance-trained male cyclists (mean ± SD, age: 36.3±7.9 years; height: 182.4 ± 4.6 cm; and body mass: 79.5 ± 4.7 kg) performed a graded exercise test (GXT; 50 W + 25 W·min) before and after 28 days of supplementation with l-arginine (ARG; 2 × 6 g·d) or placebo (PLA; cornstarch). The GXT was conducted on the subject's own bicycle using the RacerMate CompuTrainer (Seattle, WA, USA). &OV0312;o2 was continuously recorded using the ParvoMedics TrueOne 2400 metabolic cart (Salt Lake City, UT, USA) and VT was established by plotting the ventilatory equivalent for O2 (&OV0312;E/&OV0312;o2) and the ventilatory equivalent for CO2 (&OV0312;E/&OV0312;co2) and identifying the point at which &OV0312;E/&OV0312;o2 increases with no substantial changes in &OV0312;E/&OV0312;co2. l-arginine supplementation had no effect from initial &OV0312;o2max (PL, 58.7 ± 7.1 ml·kg·min; ARG, 63.5 ± 7.3 ml·kg·min) to postsupplement &OV0312;o2max (PL, 58.9 ± 6.0 ml·kg·min; ARG, 63.2 ± 7.2 ml·kg·min). Also, no effect was seen from initial VT (PL, 75.7 ± 4.6% &OV0312;o2max; ARG, 76.0 ± 5.3% &OV0312;o2max) to postsupplement VT (PL, 74.3 ± 8.1% &OV0312;o2max; ARG, 74.2 ± 6.4% &OV0312;o2max). These results indicate that l-arginine does not impact &OV0312;o2max or VT in trained male cyclists. |
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Authors:
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Kyle L Sunderland; Felicia Greer; Jacobo Morales |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of strength and conditioning research / National Strength & Conditioning Association Volume: 25 ISSN: 1533-4287 ISO Abbreviation: J Strength Cond Res Publication Date: 2011 Mar |
Date Detail:
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Created Date: 2011-02-17 Completed Date: - 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: 833-7 Citation Subset: IM |
Affiliation:
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Department of Kinesiology, California State University-Fresno, Fresno, California. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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