Like junkies without drugs, mice without running wheels crave what they lack, suggesting that some animals can develop an addiction for exercise, report scientists in the Dec. 1 issue of the journal Behavioral Neuroscience.
We all know someone who cant get enough exercise: the marathon runner who jogged 26 miles in all 50 states, the neighbor who speed walks at the crack of dawn or the cyclist who zooms by every Sunday. We might say these people are addicted to physical activity. But the debate on exercise addiction has remained largely unresolved - until now, that is.
The new study, conducted at the University of Wisconsin-Madison, adds evidence that the same brain circuitry involved in other types of craving - such as for food, drugs or sex - is activated in mice that are denied access to the running wheel. The findings, say the researchers, lend support to the addictive nature of exercise in some animals.
Stephen Gammie | EurekAlert!
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