Why one should avoid treatments that induce shivering or vasoconstriction. Why? ?

Question

When attempting to lower a persons body temperature in response to hyperthermia one should avoid treatments that induce shivering or vasoconstriction. Why?

Answer 1

Well first shivering will actually generate heat and you would not want that to reduce a body temp. I would think that also that vasodilation may divert blood so the body can act as a radiator to get rid of excessive heat.