Influência do óleo de peixe e/ou do exercício físico forçado sobre diferentes tipos de memória em ratos tratados desde o desenvolvimento até a fase adulta

• Ano de defesa: 2011
• Autor(a) principal: Rachetti, Ana Lívia Ferri [UNIFESP]
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de São Paulo (UNIFESP)
• Palavras-chave em Português: Memória; Ratos; Óleo de peixe; Ômega-3; Exercício físico forçado
• Link de acesso: http://repositorio.unifesp.br/handle/11600/9757

Both fish oil supplementation and physical exercise are able to induce benefits to mental health by providing an improvement in cognitive performance, enhancing neuroplasticity and protection against neurological lesions. In this regard, the aim of the present study was to investigate the cognitive effects of 1. a diary and prolonged 85 mg/Kg/day fish oil supplementation initiated at the prenatal period until the maturity; 2. mild forced physical exercise in treadmill initiated during the development until the adulthood and 3. association of fish oil supplementation and forced physical exercise protocol during the same period. Forty five male Wistar rats were divided into 4 groups: control vehicle (n=11), exercise vehicle (n=11), fish oil control (n=11) and exercise fish oil (n=12). On 230-day-old were submitted to the habituation in the open-filed, object recognition (240-day-old) and to the plus-maze discriminative avoidance tasks (250-day-old). After the cognitive tasks, rats were also submitted to the shock reactivity test (260-day-old) in order to discard a possible influence of the stress-induced effects on cognitive performance after a prolonged exposure to the treadmill apparatus. Our results demonstrated that a diary and prolonged fish oil supplementation can facilitate the persistence of the long-term habituation and recognition memories without, however, affecting the discriminative avoidance memory. Conversely, although the program of forced physical exercise exerted no effects on habituation or objects recognition, it was able to potentiate the persistence of the discriminative avoidance memory. Such promnestic effects (induced by both fish oil supplementation and physical exercise) were not accompanied by alterations in emotionality or exploratory activity. Neither the prolonged exposure to the treadmill apparatus nor fish oil supplementation (or their association) altered shock reactivity, ruling out the possible stressing effects induced by the physical exercise protocol on the cognitive parameters evaluated. Additionally, no synergic cognitive effects induced by the association between fish oil supplementation and physical exercise were observed. In conclusion, our findings suggest that fish oil supplementation, initiated at the prenatal period until the maturity, and physical exercise program applied throughout the life induced distinctly a better cognitive performance.