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[RC] Caffeine - Ridecamp Guest

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Authors M Doherty, PM Smith
Title   Effects of caffeine ingestion on exercise testing: A meta-analysis
Full source     International Journal of Sport Nutrition and Exercise 
Metabolism, 2004, Vol 14, Iss 6, pp 626-646

This study used the meta-analytic approach to examine the effects of caffeine 
ingestion on exercise testing. Forty double-blind studies with 76 effect sizes 
(ES) met the inclusion criteria. The type of exercise test was classified as 
endurance, graded, or short-term. In comparison with placebo, caffeine improved 
test outcome by 12.3% (95% CI, 9.1 to 15.4), which was equivalent to an overall 
ES of 0.41 (95% CI, 0.31 to 0.51). Endurance exercise significantly improved 
test outcome (P < 0.05) more than either graded or short-term exercise. When 
exercise protocol was examined, time-to-exhaustion (T-lim) protocols had a 
significantly greater (P < 0.05) ES than either the graded or the non-T-lim 
protocol(s). The results from this meta-analysis confirm the ergogenic effects 
of caffeine, particularly for endurance testing that use T-lim protocols.


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