The reproducibility of 4 km time trial (TT) performance following individualised sodium bicarbonate supplementation; a randomised controlled trial in trained cyclists

Lewis Gough, Sanjoy Deb, Andy Sparks, Lars McNaughton

Research output: Contribution to journalArticle

7 Citations (Scopus)
104 Downloads (Pure)

Abstract

Background Individual time to peak (TTP) blood bicarbonate (HCO3-) has demonstrated good to excellent reproducibility following ingestion of both 0.2 g.kg-1 body mass (BM) and 0.3 g.kg-1 BM sodium bicarbonate (NaHCO3), but the consistency of the time trial (TT) performance response using such an individualised NaHCO3 ingestion strategy remains unknown. Objective This study evaluated the reproducibility 4 km TT performance following NaHCO3 ingestion individualised to TTP HCO3-. Methods Eleven trained male cyclists completed five randomised treatments with prior ingestion of 0.2 g.kg-1 (SBC2) or 0.3 g.kg-1 BM (SBC3) NaHCO3, on two separate occasions each, or a control trial entailing no supplementation. Participants completed a 4 km cycling TT on a Velotron ergometer where time to complete, power and speed were measured; while acid-base blood parameters were also recorded (pH and blood bicarbonate concentration HCO3-) and lactate [La-]. Results Alkalosis was achieved prior to exercise in both SBC2 and SBC3, as pH and HCO3- were greater compared to baseline (p <0.001), with no differences between treatments (p >0.05). The reproducibility of the mean absolute change from baseline to peak in HCO3- was good in SBC2 (r = 0.68) and excellent in SBC3 (r = 0.78). The performance responses following both SBC2 and SBC3 displayed excellent reproducibility (r range = 0.97 to 0.99) Conclusion Results demonstrate excellent reproducibility of exercise performance following individualised NaHCO3 ingestion which is due to high reproducibility of blood acid base variables with repeat administration of NaHCO3. Using this strategy also seems to cause no dose dependent effects on performance for exercise of this duration and intensity, therefore athletes may consider smaller doses of NaHCO3 to mitigate gastrointestinal (GI) discomfort.
Original languageEnglish
Pages (from-to)1-10
JournalSports Medicine - Open
Volume3
Issue number34
Early online date21 Sep 2017
DOIs
Publication statusE-pub ahead of print - 21 Sep 2017

Keywords

  • buffering
  • alkalosis
  • performance
  • acid base balance
  • ergogenic aids
  • reliability

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