Our happy hour fact to amaze your drinking buddy with.

Extreme levels of cardiovascular exercise can lead to withdrawal symptoms similar to those found in drug addicts.

Researchers injected lab rats that had been observed running obsessively on the wheel with naloxone, a drug used to block the effects of heroin. The rodents subsequently suffered through the kind of teeth chattering and trembling associated with drug withdrawal.

A control group which didn't exercise to the extreme suffered no symptoms after injection, suggesting the wheel rats had undergone changes in their brains' reward system similar to what happens in drug addicts.

This is good stuff, as we welcome all science that justifies a sedentary lifestyle.

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