Caracterização da cartilagem articular do joelho de ratos submetidos a esforços de repetição em esteira rolante / Characterization of the knee articular cartilage of rats submitted to repetition efforts on treadmill running

AUTOR(ES)

Jose Carlos Silva Camargo Filho

DATA DE PUBLICAÇÃO

2006

RESUMO

The effects of treadmill running on the knee hyaline cartilage was studied in rats. Thirty rats were divided in to six groups (five animals in each one). Three groups were used as control and three of them ran on the treadmill one hour a day, five days/week, for 15, 30 and 60 days. After this the animals were sacrificed. The hyaline cartilage was studied by optical microscopy (staining HE), by estereotaxic magnifying glass (magnified in 16 and 32X) and by Fourier transform infrared imaging spectroscopy. These analyses were done comparing the control group with the running group, and among the running groups with different times of exercises. In the histological analysis the grade of cellular organization in the layers of the cartilage, the frequency of the clusters and the mitoses and the number of chondrocytes was considered. The measurement of the thickness of the cartilage was done. The quantity of the water in the cartilage was evaluated by the reduction of the mass by evaporation in to 150oC, following the modified International Cartilage Repair Society score (2002). All results were analyzed by non-parametric tests, using Mann Whitney and Kruskal Wallis tests, with p <= 0,05. It was observed in histological analyses that the groups with 60 days of exercise presented cellular layers more disorganized (p=0,01), a higher number of mitoses (p=0,02) and chondrocytes (p=0,003), with hyaline cartilage thinner than the other groups (p=0,01). Besides this, there was a tendency of the 60-day group to have an increase of water content (p=0,09). The examination by magnifying glass showed that the hyaline cartilage was reduced and presented abnormalities on their surfaces. It was concluded that the exercise done by the rats on the treadmill over 60 days produced degenerative signs in the knee hyaline cartilage

ASSUNTO(S)

treadmill running morfologia esteira rolante morphology thermogravimetry termogravimetria

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