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| Author(s): |
Valquiria Barboza Mariotti
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Faculdade de Medicina Veterinária e Zootecnia (FMVZ/SBD) |
| Defense date: | 2009-02-03 |
| Examining board members: |
Romeu Rodrigues de Souza;
Laura Beatriz Mesiano Maifrino;
Maria Angélica Miglino
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| Advisor: | Romeu Rodrigues de Souza |
| Abstract | |
Low levels of estrogens have been related to arterial stiffness in female women. On the other hand, physical exercises are indicated for treatment of cardiovascular deseases and for reducing central arterial stiffness in postmenopausal women. The aim of this research was studied the features of extracellular matrix of ascending aorta tunica media in female rats submitted to ovariectomy and aerobic physical exercises training. Twenty six-months-old female Wistar rats were divided in four groups (n=5): sedentary intact (sed-int), exercise-trained intact (ex-int), sedentary ovariectomized (sed-ovx) and exercise-trained ovariectomized (ex-ovx). Exercise protocol was performed on a motor treadmill in a map speed for 12 weeks five times per week. The samples were preparated by convencional histology technics. The stains used were: Hematoxylin-Eosin, Verhoeff stain, Weigerts Resorcin, Weigerts Resorcin after oxidation and Picrossirus, for quantification the volume tunica media and intima and the volume lumen of aorta, volume density of lamellae, elauninic fibers, oxytalan fibers and collagenous, respectively. Aorta tunica media was studied by stereology methods in light microscopy. The results showed the ovariectomy and aerobic physical exercises did not interfere the volume of aorta tunica media and intima, the volume of lumen neither volume tunica media and intima-to-volume lumen ratio of aorta. Ex-int showed volume density significantly major of lamellae, oxytalan fibers and collagenous. Ex-ovx showed volume density significantly minor of collagenous. In conclusion, we can suppose aerobic physical exercises can avoid the ascending aorta stiffness in Wistar rats in low levels of estrogens situations. (AU) | |