Effects of acute beta-alanine supplementation on post-exertion rating of per-ceived exertion, heart rate, blood lactate, and physical performance on the 6-minute race test in middle-distance runners

Acute effects of commercial energy drink consumption on exercise performance and cardiovascular safety: a randomized, double-blind, placebo-controlled, crossover trial

“…augmenting carnosine [ 14 ] and endothelial nitric oxide bioavailability [ 15 , 16 ]), there is also some evidence that acute dosing of these ingredients may promote exercise performance. For example, acute beta-alanine consumption has been shown to reduce perceived exertion during repeated Wingate cycling tests [ 17 ], and the limit time at maximum aerobic velocity [ 18 ] and the distance run during 6-min run tests in endurance athletes [ 19 ]. Together, these data suggest that the efficacy of energy drinks cannot be ascertained based on their caffeine-content (or any single ingredient) alone, but instead should be studied as finished products in order to accurately gauge efficacy as used by the consumer.…”