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B-71 Free Communication/Poster - Ergogenic Aids II Wednesday, May 31, 2017, 1: 00 PM - 6: 00 PM Room: Hall F

Effects Of Individualized Nahco3 Ingestion On Peak Alkalosis

1077 Board #256 May 31 3

30 PM - 5

00 PM

McNaughton, Lars R. FACSM; Sparks, Andy; Deb, Sanjoy; Gough, Lewis

Author Information
Medicine & Science in Sports & Exercise: May 2017 - Volume 49 - Issue 5S - p 295-296
doi: 10.1249/01.mss.0000517671.92604.4b
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PURPOSE: Recently it has been suggested, that an individualised sodium bicarbonate (NaHCO3) ingestion strategy might be the most appropriate method to elicit a state of peak alkalosis. Such a strategy can then be used to “marry up” time to peak alkalosis with the performance required. However, such ingestion strategies have displayed large inter-individual variation (range 10-180 min). Hence, if such a strategy is to be practically applied, the blood analyte response needs to be reproducible. This study aimed therefore, to evaluate the reproducibility of blood pH, HCO3- and Na+ following acute NaHCO3 ingestion on more than one occasion.

METHODS: Fifteen team sports players completed six randomised trials entailing ingestion of 0.2 BM NaHCO3 twice (SBC2A and B), 0.3 BM NaHCO3 twice (SBC3A and B), or two control trials (CON1A and B) on separate days. Blood analysis included pH, HCO3- and Na+ prior to and at regular time points following NaHCO3 ingestion over a three hour period.

RESULTS: Compared to pH, a greater relationship for HCO3- in both time to peak (HCO3- SBC2 = 0.772, P = 0.003, SBC3 = 0.942, P <0.001; pH SBC2 = 0.618, P = 0.044 SBC3 = 0.712, P = 0.016) and absolute change (HCO3- SBC2 = 0.890, P <0.001, SBC3 = 0.755, P = 0.008; pH SBC2 = 0.842, P = 0.001, SBC3 = 0.624, P = 0.041) was observed.

CONCLUSIONS: The results indicate that both time to peak and absolute change in HCO3- are more reliable when compared to time to peak pH. Future work should utilise an individualised NaHCO3 ingestion strategy based on HCO3- responses and evaluate the effects on exercise performance.

© 2017 American College of Sports Medicine