Running increases ethanol preference
- PMID: 12110463
- DOI: 10.1016/s0166-4328(02)00027-x
Running increases ethanol preference
Abstract
Wheel running performed by rats is reinforcing, rewarding and possibly addictive. In this study we analyzed if wheel running could affect ethanol preference. Lewis rats, known to be both addiction-prone and to develop an excessive wheel running behavior, were given access to ethanol in a two-bottle free-choice paradigm. The animals reached a high and stable ethanol intake after 5 weeks. In the next phase, rats were subjected to ethanol withdrawal for 1, 2 or 4 weeks with or without access to running wheels. Finally animals were again given access to ethanol in the same two-bottle free-choice paradigm, combined with access to running wheels. The rats that ran in running wheels during 1 or 2, but not 4, weeks of ethanol withdrawal increased both ethanol intake and preference as compared with the control group that did not have access to the wheels. Previous studies have demonstrated that low doses of morphine increases ethanol preference. Here we show that also running potentiates ethanol intake and preference. Thus, running which shares many of the reinforcing properties with addictive drugs appears to potentiate rats to an increased preference for ethanol. Our results describe a behavioral interaction where running increases ethanol consumption.
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