Post-exercise Supplementation of Sodium Bicarbonate Improves Acid Base Balance Recovery and Subsequent High-Intensity Boxing Specific Performance

The aim of this study was to assess the effects of post-exercise sodium bicarbonate (NaHCO(3)) ingestion (0.3 g.kg(−1) body mass) on the recovery of acid-base balance (pH, [Formula: see text] , and the SID) and subsequent exercise performance in elite boxers. Seven elite male professional boxers performed an initial bout of exhaustive exercise comprising of a boxing specific high-intensity interval running (HIIR) protocol, followed by a high-intensity run to volitional exhaustion (T(LIM1)). A 75 min passive recovery then ensued, whereby after 10 min recovery, participants ingested either 0.3 g.kg(−1) body mass NaHCO(3), or 0.1 g.kg(−1) body mass sodium chloride (PLA). Solutions were taste matched and administered double-blind. Participants then completed a boxing specific punch combination protocol, followed by a second high-intensity run to volitional exhaustion (T(LIM2)). Both initial bouts of T(LIM1) were well matched between PLA and NaHCO(3) (ICC; r = 0.94, p = 0.002). The change in performance from T(LIM1) to T(LIM2) was greater following NaHCO(3) compared to PLA (+164 ± 90 vs. +73 ± 78 sec; p = 0.02, CI = 45.1, 428.8, g = 1.0). Following ingestion of NaHCO(3), pH was greater prior to T(LIM2) by 0.11 ± 0.02 units (1.4%) (p < 0.001, CI = 0.09, 0.13, g = 3.4), whilst [Formula: see text] was greater by 8.8 ± 1.5 mmol.l(−1) (26.3%) compared to PLA (p < 0.001, CI = 7.3, 10.2, g = 5.1). The current study suggests that these significant increases in acid base balance during post-exercise recovery facilitated the improvement in the subsequent bout of exercise. Future research should continue to explore the role of NaHCO(3) supplementation as a recovery aid in boxing and other combat sports.