Beta Alanine? Waste

06/06/2012 23:11

High-velocity intermittent running: effects of beta-alanine supplementation.

Smith-Ryan AE, Fukuda DH, Stout JR, Kendall KL.

ABSTRACT: The use of β-alanine in sport is widespread. However, the effects across all sport activities are inconclusive. The purpose of this study was to evaluate the effects of β-alanine supplementation on high-intensity running performance and critical velocity (CV) and anaerobic running capacity (ARC). Fifty-recreationally trained men and were randomly assigned, in a double-blind fashion, to a β-alanine (BA, 2 × 800 mg tabs, 3 × daily; CarnoSyn; n=26) or placebo (PL, 2 x 800 mg maltodextrin tabs, 3 × daily; n=24) group. A graded exercise test (GXT) was performed to establish peak velocity (PV). Three high-speed runs to exhaustion were conducted at 110, 100, and 90% of PV, with 15 min of rest between bouts. The distances achieved were plotted over the times-to-exhaustion (TTE). Linear regression was used to determine the slope (CV) and y-intercept (ARC) of these relationships to assess aerobic and anaerobic performances, respectively. There were no significant treatment effects (p>0.05) on CV or ARC, for either men or women. Additionally, no TTE effects were evident for bouts at 90-110PV lasting 1.95-5.06 min. There seems to be no ergogenic effect of β-alanine supplementation on CV, ARC, or high-intensity running lasting approximately 2-5 min, in either men or women in the current study.