They also showed little change in tests of hostility or aggression. These findings do not mean that all links between anabolic steroid use and aggressive driving should be dismissed, researchers said. They suggest that increased aggression and its effects on driving may require even higher doses of the drugs. Perry says that personality traits also may help determine how steroids affect driving. The controlled design of the UI driving study may have screened out subjects predisposed to aggression by eliminating those who used illicit drugs or showed other risk behaviours.
Further work is needed to show how steroids impact driving in different personality types.
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