The Effect of Cola Beverages on Endurance Exercise Performance

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Leveritt, Michael
Minahan, Clare
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Hughes, Roger
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2008
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Abstract

Cola beverages are often made available to competitors during endurance sporting events. This thesis describes a series of investigations examining the frequency and possible physiological consequences of cola beverage use by trained endurance athletes. An initial field study assessed the knowledge, prevalence and quantity of caffeine use by athletes competing at the 2005 Ironman® Triathlon World Championships. A large majority (89%) of athletes were planning on using a caffeinated substance immediately prior to or throughout the race and a similarly high proportion (78%) indicated that cola would be one source of this caffeine. Results also indicated a trend towards greater caffeine use in those athletes aware of its recent removal from the World Anti-Doping Agency’s (WADA) prohibited substances list. The first laboratory based study investigated the ergogenic impact of changing to a cola flavoured beverage during the later stages of an endurance cycling task as. Results demonstrated that changing to a cola flavoured, but ingredient matched beverage, or an alternative flavoured sports drink following prolonged exposure to one sports drink flavour did not affect subsequent cycling time trial performance, perception of effort or perceived ratings of gastrointestinal function. These findings suggest that flavour–mediated mechanisms do not coThe final laboratory study investigated the dose-response effects of 1.5 and 3 mg∙kg-1 body weight (BW) of caffeine on exogenous CHO oxidation, and performance during endurance exercise. Again, no significant time trial performance improvements were observed during either caffeine containing trial. Additionally, when glucose was consumed in sufficient amounts to optimise its gastrointestinal absorption the addition of caffeine at either low or moderate doses did not further enhance the subsequent oxidation of this CHO.ntribute to the ergogenic potential of cola beverages consumed throughout endurance-exercise.

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Thesis (PhD Doctorate)
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Doctor of Philosophy (PhD)
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School of Public Health
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The author owns the copyright in this thesis, unless stated otherwise.
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Subject
Cola beverages
Athletes nutrition
Caffeinated substances
Endurance performance
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