Laboratory Studies of Endurance on Stationary Bicycles Have Found That

Multiple Choice

Laboratory studies of endurance on stationary bicycles have found that caffeine

A) can significantly improve work output at doses of 300-500 mg.
B) can double endurance at 80 mg,the amount in a can of Red Bull.
C) does not appear to improve performance.
D) does not work as well as it did in studies of marathon runners.