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&OV0312;o2max and ventilatory threshold of trained cyclists are not affected by 28-day l-arginine supplementation.
MedLine Citation:
PMID:  20581700     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
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.
Authors:
Kyle L Sunderland; Felicia Greer; Jacobo Morales
Publication Detail:
Type:  Journal Article    
Journal Detail:
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:
Created Date:  2011-02-17     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9415084     Medline TA:  J Strength Cond Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  833-7     Citation Subset:  IM    
Affiliation:
Department of Kinesiology, California State University-Fresno, Fresno, California.
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