Ischemic stroke is a major cause of morbidity and mortality all over the world. Among impairments observed in survivors there is a significant cognitive learning and memory deficit. Neuroprotective strategies are being investigated to minimize such deficits after an ischemia event. Here we investigated the neuroprotective potential of physical exercise and green tea in an animal model of ischemia-reperfusion. Eighty male rats were divided in 8 groups and submitted to either transient brain ischemia-reperfusion or a sham surgery after 8 weeks of physical exercise and/or green tea supplementation. Ischemia-reperfusion was performed by bilateral occlusion of the common carotid arteries during 30 min. Later, their memory was evaluated in an aversive and in a non-aversive task, and hippocampus and prefrontal cortex were removed for biochemical analyses of possible oxidative stress effects. Ischemia-reperfusion impaired learning and memory. Reactive oxygen species were increased in the hippocampus and prefrontal cortex. Eight weeks of physical exercise and/or green tea supplementation before the ischemia-reperfusion event showed a neuroprotective effect; both treatments in separate or together reduced the cognitive deficits and were able to maintain the functional levels of antioxidant enzymes and glutathione.

O processo de envelhecimento é acompanhado por uma série de alterações psicossociais e biológicas, dentre as quais está incluído o declínio cognitivo. Dependendo das condições genéticas, estilo de vida, atividades e interações sociais do idoso, o declínio pode ser acelerado ou retardado. O objetivo deste trabalho foi avaliar o perfil cognitivo, o tempo de reação, o risco de quedas e a qualidade do sono de idosos institucionalizados da cidade de Uruguaiana-RS. Foram avaliados 10 idosos de ambos os sexos utilizando como instrumentos o Mini-Exame do Estado Mental (MEEM), a Escala de Depressão Geriátrica (EDG), o Inventário de Ansiedade Traço-Estado, o Teste de Tempo de Reação (TTR), a Escala de Eficácia de Quedas (EEQ) e o Índice de Qualidade de Sono de Pittsburgh (IQSP). Os resultados apontaram a presença de declínio cognitivo em 40% dos idosos, indícios de depressão em 60% deles e tendência ao desenvolvimento de ansiedade. 76% dos idosos classificaram a qualidade de seu sono como boa, mencionando alguns fatores que interferem na mesma, e 64% revelaram haver preocupação ou medo de cair. No TTR os idosos apresentaram escore médio de 2,175 ± 0,32 s. Estes resultados podem estar relacionados ao estilo de vida adotado pela maioria dos idosos institucionalizados, fora do seu convívio familiar, favorecendo seu isolamento e sua inatividade física e mental, gerando declínio da capacidade cognitiva. Nossos resultados demonstram um percentual significativo de risco de demência, depressão e/ou ansiedade nos idosos institucionalizados avaliados.

Different tools have been used to facilitate the teaching and learning process in different areas of knowledge. Practical activities represent a form of teaching in which students not only listen to theoretical concepts but are also able to link theory and practice, and their importance in the biological sciences is notable. Sometimes, however, there is neither the time nor the resources to promote laboratory practices in physiology classes. In this sense, home-based practical activities may be an interesting alternative. Here, different approaches of practical activities were used and students' perceptions of the contributions of home-based practical activities (HBPA) and laboratory-based practical activities (LBPA) for physiology learning were collected. After each approach, the students evaluated the activities through an anonymous questionnaire. A total of 49 students completed the questionnaires, and the results demonstrate that both HBPA and LBPA were considered important contributors to physiology learning but that this contribution was more significant in the case of LBPA (χ = 4.356, P = 0.037).

The study aimed to investigate whether the Egg White Hydrolysate (EWH) is able to prevent the recognition memory disorders associated with long-term Hg exposure in by atomic fluorescence spectrometry. We confirm that the STM and LTM were impaired in adult rats exposed to Hg at low concentrations, which may be related to the increased metal deposition, ROS production and subsequent oxidative damage in the hippocampus. In addition, we demonstrated for the first time that EWH treatment is able to prevent memory impairment induced by Hg exposure, reducing Hg content and ROS production in the hippocampus. In conclusion, EWH prevents memory impairments induced by chronic exposure to low doses of Hg. These findings may represent a good public health strategy since they indicate that EWH is a promising candidate as a new natural therapy for heavy metal intoxication.