Abstract
We examined the effects of sodium bicarbonate (BIC) and sodium citrate (CIT) ingestion on distance running performance. Seven male runners [mean\(\dot VO_{2max}\) = 61.7 (SEM 1.7) ml · kg−1 · min−1] performed three 30-min treadmill runs at the lactate threshold (LT) each followed by a run to exhaustion at 110% of LT. The runs were double-blind and randomly assigned from BIC (0.3 g · kg body mass−1), CIT (0.5 g · kg body mass−1) and placebo (PLC, wheat flour, 0.5 g · kg body mass−1). Venous blood samples were collected at 5, 15 and 25 min during the run and immediately post-exhaustion (POST-EX) and analysed for pH, and the concentrations of lactate ([1a−]b) and bicarbonate ([HCO3 − ]). Performance was measured as running time to exhaustion at 110% of LT (TIME-EX). The pH was significantly higher (P ≤ 0.05) for the BIC and CIT trials during exercise, but not POST-EX compared to PLC. The [1a−]b was significantly higher (P ≤ 0.05) for the CIT trial compared to PLC during exercise, and for both CIT and BIC compared to PLC at POST-EX. Blood [HCO3 −] was significantly higher (P ≤ 0.05) during exercise for BIC compared to PLC. TIME-EX was not significantly different among treatments: BIC 287 (SEM 47.4) s; CIT 172.8 (SEM 29.7) s; and PLC 222.3 (SEM 39.7) s. Despite the fact that buffer ingestion produced favourable metabolic conditions during 30 min of high intensity steady-state exercise, a significant improvement in the subsequent maximal exercise run to exhaustion did not occur.
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Potteiger, J.A., Webster, M.J., Nickel, G.L. et al. The effects of buffer ingestion on metabolic factors related to distance running performance. Europ. J. Appl. Physiol. 72, 365–371 (1996). https://doi.org/10.1007/BF00599698
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DOI: https://doi.org/10.1007/BF00599698