1A and B),

as much in the sarcoplasm as in the endomysium. The animals of TD group (Fig. 1D) presented a reaction in the sarcoplasm very similar to the one observed on the control groups; on the other hand, the recovery was not that evident on the endomysium. The technique of picrosirius-hematoxylin (Fig. 2) showed a find more little increase on the concentration of collagen fibers on the endomysium of the animals from SD group (Fig. 2C) when compared to the control groups (Fig. 2A and B), showing a possible deposition of this kind of fiber. The TD group (Fig. 2D) presented a reaction a lot similar to the ones seen on the SC and TC groups. The ammoniacal silver technique did not show too much of a difference among the individuals of the four groups, except that the animals of group SD (Fig. Dasatinib 3C) had a little higher reaction in comparison with the animals

of the groups SC, TC and TD (Fig. 3A, B and D, respectively). Diabetic animals showed a characteristic hyperglycemia, which is considered the main factor, at cellular level, responsible for the morphological damage caused by diabetes. The hyperglycemia seems to be the central mechanism triggering the processes that lead to the ultimate pathologic changes of myocardial hypertrophy, fibrosis, and collagen deposition (Aneja et al., 2008). This condition causes an oxidative stress and activates messenger pathways that lead to cardiac fibrosis

and cell death. The link between hyperglycemia and the development of diabetic cardiomyopathy seems to involve the accumulation of advanced glycated end products (Aragno et al., 2008). Practicing physical exercises regularly is well known as an effective way to prevent numerous chronic diseases, such as diabetes. This regular practice improves the metabolic Rolziracetam control on diabetic individuals, an important component on the treatment of diabetes mellitus (American Diabetes Association, 1994). Several studies have shown the benefit effects of exercise on the control of glucose levels, both on animal experimentation and as on humans (Hardin et al., 1995, Aronson et al., 1997, Gobatto et al., 2001, Gomes et al., 2005 and Gomes et al., 2009). In the present work, although not statistically significant, exercise promotes a slight decrease in blood glucose levels. This reduction may have been sufficient to prevent some morphological changes caused by hyperglycemia. The muscle contractile stimulus lead to the translocation of the GLUT4 to the plasmatic membrane by the AMPK’s signalers pathway (Machado et al., 2006), improving the glucose caption.