Sodium bicarbonate ingestion and individual variability in time to peak pH

Andy Sparks, Emily Williams, Amy Robinson, Peter Miller, David Bentley, Craig Bridge, Lars McNaughton

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

15 Citations (Scopus)
223 Downloads (Pure)


This study determined variability in time-to-peak pH after consumption of 300 mg kg 1 of sodium bicarbonate. Seventeen participants (mean ± SD: age 21.38 ± 1.5 years; mass 75.8 ± 5.8 kg; height 176.8 ± 7.6 cm) reported to the laboratory where a resting capillary sample was taken. Then, 300 mg kg −1 of NaHCO 3 in 450 ml of flavoured water was ingested. Participants rested for 90 min and repeated blood samples were procured at 10 min intervals for 60 min and then every 5 min until 90 min. Blood pH concentrations were measured. Results suggested that time-to-peak pH (64.41 ± 18.78 min) was variable with a range of 10–85 min and a coefficient of variation of 29.16%. A bimodal distribution occurred, at 65 and 75 min. In conclusion, athletes, when using NaHCO 3 as an ergogenic aid, should determine their time-to-peak pH to best utilize the added buffering capacity this substance allows.

Original languageEnglish
Pages (from-to)58-66
Number of pages9
JournalResearch in Sports Medicine: An International Journal
Issue number1
Early online date9 Dec 2016
Publication statusPublished - 2 Jan 2017


  • Performance
  • acidity
  • buffering
  • individual response


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