Fluoxetine is an antidepressant drug of the selective serotonin reuptake inhibitor class, its use may be a therapeutic alternative in reversing or reducing the changes caused by low serotonergic activity. The increase in serotonergic levels can also be induced by regular physical exercise, in that sense, the health benefits and the prevention of diseases that this type of exercise are promoted are already well reported. However, when exercise is practiced exhaustively it may induce increased oxidative stress and changes in emotional behavior in humans and experimental animals. Therefore, the objective of this study was to evaluate the effects of subchronic treatment with fluoxetine on the behavior and oxidative parameters in rats submitted to exhaustive physical exercise in forced swimming. Therefore, adult male rats of Wistar strain were divided into sedentary animals and exposed to exhaustive exercise subcronically that were treated with fluoxetine 10 mg / kg / day (NaCl 0.9%) and saline either via i.p. for 7 days. After 30 minutes of intoxication the animals were individually exposed to exhaustive physical exercise for 20 minutes. On the eighth day of the experiment, the open field test (TCA) and the high cross labyrinth (LCE) were performed to evaluate spontaneous locomotion and anxiety - like behavior, respectively. The animals were then authanized and blood, liver and brain were collected for determination of GSH, TEAC, NO, and MDA levels. The results obtained, the animals treated with fluoxetine associated to exhaustive physical exercise showed reduction in the locomotion caused by the emotional stress in the ACT and reduction in the behavior similar to the anxiety in the LCE. Regarding the parameters of oxidative stress, fluoxetine associated with the practice of exhaustive physical exercise, in general, induced oxidative stress in the organism, mainly in the blood and liver of these animals, with reduction of the levels of GSH and TEAC and increase of levels of NO and MDA. On the other hand, in the brain, treatment with fluoxetine showed protective effect on oxidative stress, with reduction in NO and MDA levels and increase in antioxidant factors. On the data, it is concluded that fluoxetine associated with exhaustive exercise has dual effect of activity in relation to neurobehavioral and oxidative balance, reducing movement and increasing the anxiolytic effect, demonstrating antioxidant or pro-oxidant depending on the tissue or organ evaluated.
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