The Effect Of The Physical Activity On The Mechanical Properties Of Femurs And Tibial Of Osteopenic
(Abrahão, Gustavo Silva)
We evaluated the mechanical properties, obtained by essays offlexion-compression of femurs and flexion in 3 points of tibiae ofadult female ovariectomized rats and exposed to physical activity. Toperform this experiment 30 rats divided randomly in three groups wereused: group 1 ? control. Group 2: formed by ovariectomized animals, notsubmitted to physical activity. Group 3: the animals in this group weretrained in a treadmill for 5 consecutive days and then submitted to theovariectomy, remaining in rest for 24 hours. They were submitted tophysical activity for 30 minutes with a velocity of 0,31 m/s, five daysa week during 9 weeks. The femurs had their distal portion included inacrilic resinous so that the essay of flexion-compression could bedone. And the tibiae were submitted to the flexion essay in 3 points.Based on the results, graphics on the cargo versus deformation, whichshowed that the femurs of the ovariectomized rats presented astatisticaly significant reduction in its mechanical properties ofmaximun cargo and maximun deformation. The femurs of the ovariectomizedgroup and submitted to the physical activity presented higher values ofmaximun cargo and maximun deformation, than the group that was justovariectomized, however, with no statistical importance. The tibiae didnot present significant alterations in any of the mechanical propertiesstudied. The physical activity applied for 30 minutes, 5 days a weekduring 9 weeks with a velocity of 0,31 m/s was not enought to correctthe biomechanical alterations of the bone tissue caused by theovariectomy
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