The effects of enteric-coated sodium bicarbonate supplementation on 2 km rowing performance in female CrossFit® athletes

Robyn A. X. J. Martin, Nathan P. Hilton, S. Andy Sparks, Bryan Saunders, Lars Mc Naughton

Research output: Contribution to journalArticle (journal)peer-review

2 Citations (Scopus)
31 Downloads (Pure)

Abstract

Purpose: Sodium bicarbonate (SB) supplementation can improve exercise performance, but few studies consider how effective it is in female athletes. The aim of the study was to establish the effect of individually timed pre-exercise SB ingestion on 2 km rowing time trial (TT) performance in female athletes. Methods: Eleven female CrossFit® athletes (mean ± SD age, 29 y ± 4 y, body mass, 64.5 kg ± 7.1 kg, height, 1.7 m ± 0.09 m, peak oxygen uptake [VO2peak], 53.8 ± 5.7 mL·kg−1∙min−1). An initial trial identified individual time-to-peak [HCO3−] following enteric-coated 0.3 g·kg−1 BM SB ingestion. Participants then completed a 2 km TT familiarisation followed by a placebo (PLA) or SB trial, using a randomised cross-over design. Results: The ingestion of SB improved rowing performance (514.3 ± 44.6 s) compared to the PLA (529.9 ± 45.4 s) and FAM trials (522.2 ± 43.1 s) (p = 0.001, pη2 = 0.53) which represents a 2.24% improvement compared to the PLA. Individual time-to-peak alkalosis occurred 102.3 ± 22.1 min after ingestion (range 75–150 min) and resulted in increased blood [HCO3-] of 5.5 ± 1.5 mmol⋅L−1 (range = 3.8–7.9 mmol⋅L−1). The change in blood [HCO3-] was significantly correlated with the performance improvement between PLA and SB trials (r = 0.68, p = 0.020). Conclusions: Ingesting a 0.3 g·kg−1 BM dose of enteric-coated SB improves 2 km rowing performance in female athletes. The improvement is directly related to the extracellular buffering capacity even when blood [HCO3-] does not change ≥ 5.0 mmol⋅L−1.
Original languageEnglish
Pages (from-to)1191-1198
Number of pages8
JournalEuropean Journal of Applied Physiology
Volume123
Issue number6
Early online date27 Jan 2023
DOIs
Publication statusPublished - 27 Jan 2023

Keywords

  • Gastrointestinal symptoms
  • Acid–base balance
  • Extracellular Buffer
  • Time trial

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