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Muscle acidification is one of the main factors causing fatigue during exercise, thus compromising performance. The sport supplements beta alanine (β-A) and sodium bicarbonate (SB) are thought to enhance the effects of the body’s buffer systems by reducing H +  concentrations. The aim of this systematic review was to analyze the effects of β-A and SB co-supplementation on the organism’s buffering capacity and sport performance. The databases PubMed, Web of Science, Medline, CINAHL and SPORTDiscus were searched until November 2021 following PRISMA guidelines. Randomized controlled trials, at least single-blind, performed in athletes of any age were considered. Nine studies including a total of 221 athletes were identified for review. Athletes were supplemented with β-A and SB while they performed exercise tests to assess physical performance and buffer capacity. Five of the nine studies indicated there was some additional improvement in buffering capacity and performance with co-supplementation, while one study concluded that the effect was comparable to the added effects of the individual supplements. According to the results of the studies reviewed, we would recommend β-A and SB co-supplementation during high intensity exercises lasting between 30 s and 10 min.

Effect of β-alanine and sodium bicarbonate co-supplementation on the body’s buffering capacity and sports performance: A systematic review