Adult male rats were exposed to a diet that contained 100 parts per million added cadmium or a control diet for 72 days before being tested in a Digiscan activity monitor. During the 1-hr test period, each animal's baseline activity levels were recorded for 20 min. Animals then received intraperitoneal injections of 0, 10, 20, or 40 mg/kg cocaine HCl, and their activity levels were recorded for the remaining 40 min of the test session. The results showed that the 10, 20, and 40 mg/kg doses of cocaine produced behavioral activation in the control-diet animals. For cadmium-treated animals, cocaine-induced behavioral changes at the 10 mg/kg dose were not observed, but increased activity was evident at the two higher doses.
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