By GINA KOLATA
Published: March 25, 2009
WELDON JOHNSON first tried caffeine as a performance enhancer in 1998. He was not a coffee drinker but had heard that caffeine could make him run faster. So he went to a convenience store before a race and drank a cup of coffee.
For the first time in his life, he ran 10 kilometers in less than 30 minutes.
“I remember being really wired before the race,” he said in an e-mail message. “My body was shaking.”
From then on, he was a convert.......
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