Sodium bicarbonate ingestion does not alter the slow component of oxygen uptake kinetics in professional cyclists

Alfredo Santalla, Margarita Pérez, Manuel Montilla, Lázaro Vicente, Richard Davison, Conrad Earnest, Alejandro Lucía

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Abstract

We examined the effects of pre-exercise sodium bicarbonate (NaHCO3) ingestion on the slow component of oxygen uptake (VO2) kinetics in seven professional road cyclists during intense exercise. One hour after ingesting either a placebo or NaHCO3 (0.3 g x kg body mass(-1)), each cyclist (age, 25 +/- 2 years; VO2max, 74.7 +/- 5.9 ml x kg(-1) x min(-1); mean +/- s) performed two bouts of 6 min duration at an intensity of 90% VO2max interspersed by 8 min of active recovery. Gas exchange and blood data (pH, blood lactate concentration and [HCO3-]) were collected during the tests. In both bouts, the slow component of VO2 was defined as the difference between end-exercise VO2 and the VO2 at the end of the third minute. No significant difference was found in the slow component of VO2 between conditions in the first (NaHCO3, 210 +/- 69 ml; placebo, 239 +/- 105 ml) or second trial (NaHCO3, 123 +/- 88 ml; placebo, 197 +/- 101 ml). In conclusion, pre-exercise NaHCO3 ingestion did not significantly attenuate the VO2 slow component of professional road cyclists during high-intensity exercise.

Original languageEnglish
Pages (from-to)39-47
Number of pages9
JournalJournal of Sports Sciences
Volume21
Issue number1
Publication statusPublished - Jan 2003
Externally publishedYes

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Keywords

  • Acid-Base Equilibrium
  • Adult
  • Alkalosis
  • Analysis of Variance
  • Bicycling
  • Exercise Test
  • Humans
  • Lactic Acid
  • Male
  • Oxygen Consumption
  • Physical Endurance
  • Physical Fitness
  • Pulmonary Gas Exchange
  • Sodium Bicarbonate
  • Clinical Trial
  • Journal Article
  • Randomized Controlled Trial

Cite this

Santalla, A., Pérez, M., Montilla, M., Vicente, L., Davison, R., Earnest, C., & Lucía, A. (2003). Sodium bicarbonate ingestion does not alter the slow component of oxygen uptake kinetics in professional cyclists. Journal of Sports Sciences, 21(1), 39-47.