What has the extensive testing of the effects of amphetamines concluded?
A) Amphetamines do not really improve athletic performances
B) Amphetamines can improve performances by a few percentage points
C) Amphetamines actually make people perform more poorly
D) Amphetamines enhance total work output by 30 percent or more

Question

Quizplus · Accepted Answer

Extensive testing has shown that amphetamines can improve performances by a few percentage points, particularly in terms of endurance and alertness, but not to the extent of 30 percent or more.

What Has the Extensive Testing of the Effects of Amphetamines