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Background  Individual time to peak blood bicarbonate (HCO 3   − ) 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 (NaHCO 3 ), but the consistency of the time trial (TT) performance response using such an individualised NaHCO 3  ingestion strategy remains unknown. This study therefore evaluated the reproducibility of 4-km TT performance following NaHCO 3  ingestion individualised to time to peak blood bicarbonate.    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) NaHCO 3 , 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, whilst acid-base blood parameters were also recorded (pH and blood bicarbonate concentration HCO 3   − ) and lactate [La − ].    Results  Alkalosis was achieved prior to exercise in both SBC2 and SBC3, as pH and HCO 3   −  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 HCO 3   −  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).    Conclusions  Results demonstrate excellent reproducibility of exercise performance following individualised NaHCO 3  ingestion, which is due to the high reproducibility of blood acid-base variables with repeat administration of NaHCO 3 . Using a time to peak HCO 3   -  strategy seems to cause no dose-dependent effects on performance for exercise of this duration and intensity; therefore, athletes may consider smaller doses of NaHCO 3  to mitigate gastrointestinal (GI) discomfort.

sports medicine - open/sports medicine - open

The Reproducibility of 4-km Time Trial (TT) Performance Following Individualised Sodium Bicarbonate Supplementation: a Randomised Controlled Trial in Trained Cyclists