exogenous buffer

ex·og·e·nous buf·fer

(eks-oj'ĕ-nŭs bŭf'ĕr)
Sodium bicarbonate or sodium citrate taken orally before competition by sprint-type athletes to raise extracellular pH; enhances performance in short-term, maximal exercise that generates high levels of muscle and blood lactate.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
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The proposed model illustrates the variation of cytosolic calcium concentration for the exogenous buffers.