The effects of sodium bicarbonate and caffeine supplementation on repeated Wingates

Brown, Emily (2017) The effects of sodium bicarbonate and caffeine supplementation on repeated Wingates. Undergraduate thesis, University of Chichester.

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Abstract

Introduction: Sodium bicarbonate and caffeine are ergogenic aids commonly used to enhance performance of repeated high-intensity exercise bouts. Performance enhancements following sodium bicarbonate ingestion are commonly attributed to elevated blood bicarbonate concentrations and blood pH, increasing extracellular buffering capacity of hydrogen ions (Siegler, Midgley, Polman, & Lever, 2010). Improvements in total work output following CAF ingestion have been attributed to increased glycogenolysis via enhanced calcium release from the sarcoplasmic reticulum (Pruscino, Ross, Gregory, Savage & Flanagan, 2008). As SB and CAF exert their ergogenic effects through different mechanisms, it would be beneficial to determine which is more efficient in improving repeated high-intensity exercise bouts.
Aim: The purpose of the current study was to identify which ergogenic aid; sodium bicarbonate or caffeine, is more effective in reducing fatigue and increasing power output during four, 30-second repeated Wingates.
Method: Using a randomised, double-blind, placebo-controlled, crossover design, one male and seven females (age 22 ± 1 years, height 1.68 ± 0.06 m, mass 67.3 ± 9.2 kg) in a random order, ingested 0.3 g∙kg-1 of sodium bicarbonate, 6 mg.kg-1 of caffeine, or a placebo (20 ml lemon squash and 500 ml water), 60 minutes prior to performing four, 30-second repeated Wingates with one minute recovery between bouts. Peak power, mean power and minimum power were recorded from each Wingate. Fatigue index was calculated. Heart rate and rating of perceived exertion were recorded immediately after each Wingate.
Results: There were no significant differences in mean peak power (p = 0.767), mean mean power (p = 0.927), mean minimum power (p = 0.052), fatigue index (p = 0.430) or mean rating of perceived exertion (p = 0.401), across the four Wingates between conditions. Mean heart rate taken immediately after each Wingate was significantly higher in the caffeine condition compared to sodium bicarbonate (p = 0.012) and placebo (p = 0.012).
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Conclusion: Neither 0.3 g.kg-1 sodium bicarbonate or 6 mg.kg-1 caffeine increased power output during repeated 30-second Wingates, with one minute recovery between bouts, and therefore is not ergogenic for performance of this duration.

Item Type: Thesis (Undergraduate)
Additional Information: BSc (Hons) Sport and Exercise Science
Subjects: Q Science > Q Science (General)
Divisions: Departments > Sport and Exercise Sciences
Undergraduate Dissertations
Depositing User: Ann Jones
Date Deposited: 31 Oct 2017 14:37
Last Modified: 31 Oct 2017 14:37
URI: http://eprints.chi.ac.uk/id/eprint/3075

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