C57BL/6J mice were given five weeks of voluntary wheel running and then studied for behavioral impairment after an intoxicating dose of ethanol. Forty-four mice, 22 males and 22 females, were assigned to Wheel (free access to a running wheel in the home cage) or No Wheel conditions. At the end of the training period, animals were removed from the exercise cages and tested for noise avoidance after 2.4 g/kg ethanol (EtOH) or physiological saline (Sal). Mice could avoid 87.5-dB noise by entering and remaining in a randomly designated "safe corner." In unexercised animals, EtOH caused a strong suppression of locomotor activity and avoidance behavior: No Wheel EtOH mice differed significantly from No Wheel Sal mice on both measures. In exercised animals, EtOH failed to cause significant suppression: Wheel EtOH animals did not differ significantly from Wheel Sal animals on either measure. The present results suggest that prior exercise training may be effective in offsetting the effects of acute ethanol intoxication.
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