Evidências de que um protocolo de atividade física pode reduzir a contagem de leucócitos sinoviais de ratos artríticos

Abstract

ABSTRACTintroduction: physical activity is thought to be beneficial to arthritis, delaying disability and/or improving joint function. in vivo studies using experimental models of arthritis may provide useful information about such benefits. Objective: The aim of the present study was to evaluate the effects of the low-intensity exercise on a model of CFA-induced arthritis in rats. Methods: Articular incapacitation was measured by the paw elevation time in 1-min periods of stimulated walk. Edema was evaluated by the knee-joint diameter. Synovial exudate was sampled after 10 days for leukocyte count. The exercise protocol consisted of a 2-min period of stimulated walk in the 1st day, 10 min in the 2nd day, and 20 min from the 3rd to the 10th day; The control animals were submitted to 1-min period of stimulated walk once a day over 10 days. Corticosteroid involvement was assessed by treating the animals with aminoglutethimide. Results: The exercise protocol produced a slight but sustained reduction of disability and joint swelling associated with a large reduction in the synovial leukocyte count. Aminoglutethimide only prevented the effect on synovial leukocyte count. Conclusion: These results suggest that a low-intensity physical activity does not aggravate the symptoms of arthritic animals, in fact showing a slight improvement, and still can markedly reduce the migration of leukocytes into the synovial space.

Exercise Exacerbates the Transcriptional Profile of Hypoxia, Oxidative Stress and Inflammation in Rats with Adjuvant-Induced Arthritis

“…In experimental models of arthritis, it has been confirmed that mechanical stress increase joint inflammation, stimulate the progression and chronicity of arthritis and structural damage [16,17,48]; besides, the mechanical stress decrease the bone quality [16]. In contrast to our findings, other studies in the AIA model have shown an anti-inflammatory effect of PE in some parameters such as synovial hyperplasia [49,50], and joint destruction [51].…”

“…Moreover, the severity of arthritis at the starting time of PE could be definitory. Studies in the AIA model that started the PE at the pre-arthritic stage [49,50] showed beneficial results. However, we started the PE at an arthritic stage because we think this scenario is more representative of RA patients.…”