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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Efeitos do exerc?cio f?sico sobre a fun??o cognitiva e os n?veis plasm?ticos de BDNF em mulheres idosas

Vedovelli, Kelem 25 August 2017 (has links)
Submitted by PPG Gerontologia Biom?dica (geronbio@pucrs.br) on 2017-11-29T17:04:43Z No. of bitstreams: 1 VEDOVELLI_KELLEM_TESE.pdf: 2587462 bytes, checksum: 3fe069c3be1a03d543e406d18fdf3317 (MD5) / Approved for entry into archive by Caroline Xavier (caroline.xavier@pucrs.br) on 2017-12-04T15:44:11Z (GMT) No. of bitstreams: 1 VEDOVELLI_KELLEM_TESE.pdf: 2587462 bytes, checksum: 3fe069c3be1a03d543e406d18fdf3317 (MD5) / Made available in DSpace on 2017-12-04T15:54:01Z (GMT). No. of bitstreams: 1 VEDOVELLI_KELLEM_TESE.pdf: 2587462 bytes, checksum: 3fe069c3be1a03d543e406d18fdf3317 (MD5) Previous issue date: 2017-08-25 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / Introduction: Physical activity has been proposed as a promising intervention to improve cognition and decrease the risk of dementia in older adults. Brain-derived neurotrophic factor (BDNF) seems to mediate, at least partially, these effects of exercise. However, intervention studies of the effects of multimodal exercises on cognition and BDNF levels are scarce and composed by small samples. Thus, the generalization of the conclusions of these studies depends on the reproducibility of the results. Objective: to contribute to the knowledge on the field, the present study evaluated the effects of a physical activity intervention composed by muscle strengthening and aerobic conditioning on BDNF levels and cognition in older women. Methods: Twenty-two independent and non-demented subjects (? 75 years) were assigned to a three-month physical activity intervention (60 min exercise sessions three times a week, 30 min of muscle strengthening and 30 min of aerobic activity) or to a control condition (n= 10, no exercise). The clinical parameters (anxiety and depression symptoms), neuropsychological (Digit Span, Stroop, Trail Making and Contextual Memory tests), physical (upper and lower limb strength, aerobic conditioning) and physiological (serum BDNF) parameters were evaluated immediately before, one and three-months after starting intervention. Results: the control group had stable levels for all measured variables, whereas the intervention group improved on physical fitness, depressive symptoms, cognitive performance and BDNF levels. Moreover, a linear regression identified an association between aerobic conditioning and BDNF levels. Conclusion: The combination of muscle strengthening and aerobic conditioning was able to improve cognitive performance and increase BDNF levels. Aerobic conditioning seems to be an important mediator of these results. / Introdu??o: A atividade f?sica tem sido proposta como uma interven??o promissora para melhorar a cogni??o e diminuir o risco de dem?ncia em adultos mais velhos. O fator neurotr?fico derivado do c?rebro (BDNF) parece mediar, pelo menos parcialmente, esses efeitos do exerc?cio. Entretanto, os estudos de interven??o dos efeitos de exerc?cios multimodais sobre o desempenho cognitivo e os n?veis de BDNF s?o escassos e compostos por pequenas amostras. Assim, a generaliza??o das conclus?es destes estudos depende da reprodutibilidade dos resultados. Objetivo: avaliar os efeitos de uma interven??o de atividade f?sica composta pelo fortalecimento muscular e condicionamento aer?bico nos n?veis de BDNF e cogni??o em mulheres idosas, de modo a contribuir para o avan?o cient?fico na ?rea. M?todos: Idosas independentes e n?o demenciadas (? 75 anos) foram submetidas a uma interven??o de tr?s meses de atividade f?sica (n = 22, sess?es de exerc?cios de 60 min tr?s vezes por semana, sendo 30 min de fortalecimento muscular e 30 min de atividade aer?bia) ou a uma condi??o de controle (n = 10, sem exerc?cio). Foram avaliados os par?metros cl?nicos (sintomas de ansiedade e depress?o), neuropsicol?gicos (testes de Span de D?gitos, Stroop, Trail Making e Mem?ria Contextual), f?sicos (for?a dos membros superiores e inferiores, condicionamento aer?bico) e fisiol?gicos (BDNF s?rico) no in?cio do protocolo, 1 e 3 meses ap?s o in?cio da interven??o. Resultados: O grupo controle apresentou n?veis est?veis ao longo do tempo para todas as vari?veis medidas, ao passo que o grupo de interven??o melhorou a aptid?o f?sica, sintomas depressivos, desempenho cognitivo e n?veis de BDNF. Al?m disso, uma regress?o linear identificou uma associa??o entre o condicionamento aer?bio e os n?veis de BDNF. Conclus?o: A combina??o de fortalecimento muscular e condicionamento aer?bio foi capaz de melhorar o desempenho cognitivo e aumentar os n?veis de BDNF. O condicionamento aer?bio parece ser um importante mediador desses resultados.

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