Final answer:
Sympathetic stimulation of the afferent and efferent arterioles during exercise leads to decreased urinary output.
Step-by-step explanation:
During exercise, sympathetic stimulation of the afferent and efferent arterioles leads to vasoconstriction, resulting in decreased blood flow through the kidneys. This decreases the net filtration pressure and ultimately decreases urinary output. Therefore, the statement is true.