Caffeine in Sport
In this report:
Caffeine consumption can affect the body in a number of ways, principally through the Key Points
Sound evidence exists to demonstrate that adenosine receptors (2). Due to the complex caffeine has ergogenic effects on both short biochemistry and interacting responses, the and long term endurance as well as short term ergogenic effect of caffeine remain unclear. Evidence also supports the positive effect of modulation of the hormones involved in fat performance such as concentration, alertness, sparing (1). Recent findings, however, do not oxidation is not important in some situations unclear, although it is likely that caffeine stimulates the central nervous system altering sympathetic activity, motor recruitment and Performance benefits have been shown with It is well established that caffeine can doses ranging from 1-13 mg/kg body mass; although it would appear that there is no dose recruitment and perception of effort and It appears that caffeine does not promote pain (3). It may be this later mechanism diuresis when taken before or during exercise which may account for the ability of caffeine CAFFEINE INGESTION ON
Short and Long Term Endurance
Endurance is best described as the ability of
Caffeine (1,3,7-trimethylxanthine) is a naturally intensity for as long as possible and can be occurring compound found in the leaves, nuts and seeds of various plants. Despite being classified (performance test) or exercise to exhaustion as a drug, caffeine is currently legal, socially (capacity test). Caffeine has been shown to acceptable and enjoys widespread use around the world. Caffeine is commonly consumed in various forms including coffee, tea and soft drinks, 120-minutes (1,4,5,6,7,8). The magnitude of providing approximately 30-100 mg of caffeine per serve. Within the UK, the mean daily caffeine intake is estimated at 4 mg/kg body mass while it study design. Currently, only a few studies is recognised that heavy tea and coffee drinkers report no ergogenic benefits of caffeine (9), consume an estimated 7.5 mg/kg body mass with no studies reporting a negative effect. (default mass; 50 kg). Supporting research for the These results appear to be independent of ergogenic properties of caffeine stretches back individual fitness level, caffeine dose, 100 years, with the first well controlled study reportedly published in 1907 (1) . Since then caffeine has become one of the most widely Short Term High Intensity Intermittent
researched ergogenic aids, with reported benefits Exercise
applicable across a range of different sports. Stuart et al. (10) and Scheiker et al. (11) have investigated the impact of caffeine on the short term high intensity intermittent sprinting demands minute cycling time trial improved attention, similar to those of team sports. Despite different research designs, both reported the ingestion of recognition memory compared with placebo. 6 mg/kg body mass caffeine 60-minutes prior to exercise improved the amount of work done within the military, with the beneficial effects (sprints) compared to placebo in both the first of caffeine ingestion on reaction time and and second half by 6-10%. It was concluded that sustained attention, or vigilance, tasks intermittent high intensity team sport by delaying the onset of fatigue. Currently, the effect of caffeine on single sprints lasting less than one exercise testing, regardless of mode, intensity or duration of exercise is an Caffeine taken in combination with
completed a meta-analysis on the impact of ingestion of caffeine in combination with caffeine on Rating of Perceived Exertion carbohydrate may have synergistic effects on (RPE) and reported that in comparison to performance. In 2000, Van Nieuwenhoven et al. placebo caffeine represents a 6% reduction (12) reported that intestinal glucose absorption withdrawal, caffeine dose and interval time ingested with carbohydrate (1.4 mg/kg and 0.5 g/min respectively). As intestinal absorption is one of the limiting factors for exogenous perceived effort at a given exercise intensity carbohydrate oxidation, Yeo et al (13) investigated carbohydrate would increase the availability of ingested carbohydrate and thus exogenous carbohydrate oxidation during prolonged PRACTICAL CONSIDERATIONS OF
endurance exercise. In 8 well trained cyclists a CAFFEINE INGESTION
oxidation was found. As carbohydrate feeding Well controlled studies demonstrate that the during prolonged exercise can postpone fatigue ingestion of 3-13 mg/kg body mass caffeine and enhance endurance capacity, the potential improves endurance performance (i.e. 210 application to the endurance performer is – 910 mg caffeine for a 70 kg athlete). Of those studies investigating varying doses of caffeine it would appear that a caffeine CAFFEINE INGESTION ON COGNITIVE
performance, but higher intakes will not There is a long history of scientific interest into always result in an increased benefit (6,8,17). the effects of caffeine on cognitive functions. Interestingly, the work of Cox et al., (4) Research has clearly demonstrated that caffeine reported improvements in performance with through its effects on the central nervous system, caffeine ingestion at doses as low 1 mg/kg can significantly improve alertness (14), concentration (15,16), memory (7,14) and reaction response following a time trial performance. time (14,16). Such results have been shown to Currently data investigating the comparison occur at caffeine doses as low as 12.5 mg to of single and repeated doses of caffeine has doses as high as 350 mg, with the ingestion of found that caffeine divided between before caffeine in isolation (16) or in combination with and during exercise provides no ergogenic carbohydrate (7,15). Whilst further sport and exercise specific research is required in this area, Hogervorst et al. (7) did report the ingestion of References
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Doherty, M. and Smith, P.M. (2005). Effects of Diuretic effect of caffeine
caffeine ingestion on rating of perceived exertion Caffeine under sedentary conditions may have a during and after exercise: a meta-analysis. Scandinavian Journal of Medicine and Science in diuretic action (19), and athletes are often advised Sports, 15, 69-78.
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did not find any impact of caffeine ingestion (6,20). Thus, caffeine is a diuretic in resting conditions Doherty, M. and Smith, P.M. (2004). Effects of caffeine ingestion on exercise testing: A Meta- but not during exercise and therefore it would analysis. International Journal of Sport Nutrition and appear there is no clear reason to refrain from Exercise Metabolism, 14, 626-646.
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Possible Adverse Effects
Schneiker, K.T., Bishop, D., Dawson, B. and Hackett, L.P. (2006). Effects of caffeine on Caffeine use in sport can have side effects, prolonged intermittent sprint ability in team sport particularly when ingesting high doses (greater athletes. Medicine and Science in Sports and than 500 mg per day) or when taken by those Exercise, 38, 578-585.
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