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.

Question

Quizplus · Accepted Answer

Laboratory studies have shown that caffeine can significantly improve work output at doses of 300-500 mg, which is higher than the amount found in a can of Red Bull. While it may not work as well for marathon runners, it has been found to improve endurance for stationary bicycle tasks.

Laboratory Studies of Endurance on Stationary Bicycles Have Found That