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

Gough, Lewis Anthony and Deb, Sanjoy Kumar and Sparks, Andy and McNaughton, Lars Robert (2017) The Reproducibility of 4-km Time Trial (TT) Performance Following Individualised Sodium Bicarbonate Supplementation: a Randomised Controlled Trial in Trained Cyclists. Sports medicine - open, 3 (1). p. 34. ISSN 2199-1170

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Abstract

BACKGROUND

Individual time to peak blood bicarbonate (HCO) has demonstrated good to excellent reproducibility following ingestion of both 0.2 g kg body mass (BM) and 0.3 g kg BM sodium bicarbonate (NaHCO), but the consistency of the time trial (TT) performance response using such an individualised NaHCO ingestion strategy remains unknown. This study therefore evaluated the reproducibility of 4-km TT performance following NaHCO 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 (SBC2) or 0.3 g kg BM (SBC3) NaHCO, 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) and lactate [La].

RESULTS

Alkalosis was achieved prior to exercise in both SBC2 and SBC3, as pH and HCO 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 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 ingestion, which is due to the high reproducibility of blood acid-base variables with repeat administration of NaHCO. Using a time to peak HCO 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 to mitigate gastrointestinal (GI) discomfort.

Item Type: Article
Subjects: B400 Nutrition
C100 Biology
C600 Sports Science
C700 Molecular Biology, Biophysics and Biochemistry
Divisions: REF UoA Output Collections > REF2021 UoA 03: Allied Health Professions, Dentistry, Nursing & Pharmacy
Depositing User: Lewis Gough
Date Deposited: 14 Feb 2019 13:01
Last Modified: 14 Feb 2019 13:01
URI: http://www.open-access.bcu.ac.uk/id/eprint/6995

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