Caffeinated Runner

A number of studies have shown significant performance increases in various endurance disciplines, includingrunning, following caffeine ingestion. In one study, elite runners improved their time in a treadmill run to exhaustion by 1.9 percent with caffeine. Caffeine boosted time to exhaustion in a cycling test by 15 minutes in another study. And in a study involving swimmers, caffeine was found to enhance performance in maximal-effort swims of up to 25 minutes' duration.