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| Author(s): |
Alessandra Choqueta de Tolêdo
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Faculdade de Medicina (FM/SBD) |
| Defense date: | 2009-08-06 |
| Examining board members: |
Milton de Arruda Martins;
Claudia Marina Fló;
José Roberto de Brito Jardim;
Carla Máximo Prado;
Lisete Ribeiro Teixeira
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| Advisor: | Milton de Arruda Martins |
| Abstract | |
Aerobic exercise was recently described as capable to reduce lung function decline and risk of developing COPD among active smokers. The biological plausibility of the influence of physical activity on the decline of lung function relies on the anti-inflammatory effects of physical activity, which have been described in experimental studies. We hypothesized there would be an interaction between aerobic exercise and development of disease. In order to further explore the physiopathology of COPD induced by exposure to cigarette smoke and the effects of exercise in development of emphysema, we used an experimental model of DPOC. C57Bl6 were divided in four groups: Control, Smoke, Exercise and Smoke/Exercise. Smoke groups were exposed to cigarette smoke for 30 minutes a day, 5 days a week, for 24 weeks. Exercise groups were trained at moderate intensity exercise for 60 minutes/day, 5 days/week for 24 weeks. The results demonstrated that regular aerobic physical training of moderate intensity inhibited alveolar distension, the increase of total inflammatory cells and production of reactive oxygen species in BAL and the increase in the generation of exhaled nitric oxide induced by exposure to cigarette smoke, and reduced the expression of 8-isoprostane and MCP1 and increased the expression of GPx, SODCuZn, TIMP1 and IL-10 by inflammatory cells in the alveolar wall. The study also showed that aerobic physical training was able to inhibit the decrease in lung elastance induced by exposure to cigarette smoke, but not the content in collagen fibers. These results suggest that regular aerobic physical training of moderate intensity may play an important role during the installation of disease due to its antioxidant and antiinflammatory effects (AU) | |