Additive Benefits of [beta]-Alanine Supplementation and Sprint-Interval Training.

Purpose: The present study investigated the effects of [beta]-alanine supplementation only, and in combination with sprint-interval training (SIT), on training intensity, and energy provision and performance during exhaustive supramaximal-intensity cycling and a 4- and 10-km time trial (TT). Methods: Fourteen trained cyclists (VO2max = 4.5 +/- 0.6 L[middle dot]min-1) participated in this placebo-controlled, double-blind study. Subjects performed a supramaximal cycling test to exhaustion (equivalent to 120% VO2max) and a 4- and 10-km TT and 4 x 1-km sprints at three time points: before and after 28 d of supplementation loading (6.4 g[middle dot]d-1) with [beta]-alanine (n = 7) or a placebo (n = 7), and after a 5-wk supervised, SIT program performed twice weekly (repeated 1-km cycling sprints) whilst maintaining supplementation with [beta]-alanine (1.2 g[middle dot]d-1) or a placebo. Results: Following the loading period, sprint 3 and 4 of the 4 x 1-km sprint intervals were improved with [beta]-alanine supplementation (4.5 +/- 3.4% and 7.0 +/- 4.0%; P

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