As a follow-up to a previous entry on performance enhancement via caffeine, here are a few more recent articles and their relevancy to distance running performance:
Caffeine is effective for enhancing sport performance in trained athletes when consumed in low-to-moderate dosages (~3-6 mg/kg) and overall does not result in further enhancement in performance when consumed in higher dosages (>/= 9 mg/kg).Caffeine exerts a greater ergogenic effect when consumed in an anhydrous state as compared to coffee.Caffeine is ergogenic for sustained maximal endurance exercise, and has been shown to be highly effective for time-trial performance.The scientific literature does not support caffeine-induced diuresis during exercise, or any harmful change in fluid balance that would negatively affect performance.
A 3 mg · kg(-1) dose of caffeine significantly improves exercise performance irrespective of whether a 4-day withdrawal period is imposed on habitual caffeine users.
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