"[Total work done] TWD during the [capacity test at 110% maximum power] CCT110% was increased in all conditions post-supplementation, with the largest increases being shown with b-alanine (+7.9% PP, +4.1% PSB, +11.1% BAP and +17.6% BASB). Supplementation with [beta-alanine + sodium bicarbonate] BASB resulted in significantly greater TWD during the CCT110% than during the other conditions (P < 0.05)." (Craig. 2010)Obviously two H+ buffers are better than one. The further increase in exercise performance in the beta-alanine + sodium bicarbonate group may well be explained by slightly different mechanisms of action:
"In the blood, bicarbonate is the main buffer with phosphate as one of the many other buffering agents. In muscle tissue, phosphate and carnosine together provide approximately 90% of the muscle’s buffering capacity. Bicarbonate only plays a minor role." (Di Pasquale. 2008. 275)It is therefore only logical to supplement both, sodium bicarbonate, as well as beta-alanine, in an effort to maximize exercise performance.