Iranian Journal of

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Background: Diabetic cardiomyopathy is the first cause of death in diabetic patients and angiogenesis is the most important mechanism for the recovery of heart blood flow in physiologic and pathologic conditions. The purpose of this study was to compare the effect of eight weeks of moderate continuous and sever interval training on heart angiogenesis in Wistar male diabetic rats.
Methods: 32 Wistar rats were randomly assigned into 4 groups: healthy non-exercised, diabetic no exercise, diabetic + moderate continuation and diabetic + severe interval exercises. Two types of exercises were calibrated and the exercise intensity was determined based on the maximum oxygen consumption and 5 days a week. The pro-angiogenic (VEGF, MMP₂, TGFβ₁) and anti-angiogenic (TIMP2) agents of the left ventricle of the heart were taken from the rat after 48 hours of the last training session. Western blot method was used to evaluate the synthesis of proteins involved in angiogenic route. Data were measured by one-way variance analysis with repeated measurements (P =0/000).
Results: The results showed that the levels of proangiogenic VEGF, MMP₂, TGFβ1 significantly increased, but the anti-angiogenic factor of TIMP₂ decreased (P <0.05). In addition, the maximum level of oxygen consumed in both continuous and periodic training groups showed a significant increase.
Conclusion: Moderate and continuous exercise increases angiogenic factors in the heart of diabetic Wistar rats, which is a good way to reduce the mortality rate of diabetes.

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Background: Diabetic cardiomyopathy is a complication type 2 diabetes mellitus that can lead to cardiac muscle autophagy through the proteins FOXO3a and Beclin-1. Therefore, the aim of this study is to investigate the effect of 8 weeks High intensity interval training (HIIT) on the content of FOXO3a and Beclin-1 proteins in heart muscle tissue of Sprague-Dawley rats with type 2 diabetic rats.
Methods: In this experimental study, 12 two-month-old Sprague-Dawley rats with a mean weight of 270±20 g were selected. After diabetic induction with STZ and Nicotinamide, rats were randomly assigned to two groups, diabetic training (6 heads) and diabetic control (6 heads). The training group trained for 4 days a week in accordance with the training program (each session 42 minutes, 10-30 m/m) for 8 weeks, while the control group did not have any training program. Also, rats did not receive any insulin treatment during the study period. The independent t-test was used to analyze the data. Significance level is considered p≤0.05.
Results: Eight weeks of HIIT training resulted in a significant decrease in FOXO3a (P=0.008) and Beclin-1 (P=0.002) proteins content in diabetic training group compared to diabetic control group.
Conclusion: It can be said that eight weeks of HIIT training decreased the FOXO3a/Beclin-1 autophagy pathway by decreasing FOXO3a and Beclin-1 protein content. Therefore, the use of HIIT exercises may be useful for diabetic subjects who are prone to diabetic cardiomyopathy.

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Background: FOXO family proteins are important factors in autophagy pathway. Protein kinase-B is an important regulator for this family that can be regulated through exercise training. Therefore, the aim of this study is to investigate the effect of protein kinase-B (PKB) on FOXO autophagy family proteins (FOXO1 and FOXO3a) following high intensity interval training (HIIT) in the left ventricle of the heart of diabetic rats by streptozotocin (STZ) and nicotinamide.
Methods: In this experimental study, 12 two-month-old Sprague-Dawley rats with a mean weight of 270±20 g were selected. After type 2 diabetes induction with STZ and Nicotinamide, rats were randomly assigned to two groups, diabetic training (6 heads) and diabetic control (6 heads). The training group trained for 4 days a week in accordance with the training program for 8 weeks. SPSS software version 23 and independent t-test were used to analyze the data. Significance level is considered p≤0.05.
Results: HIIT training resulted in a significant increase in PKB protein content between training and control groups (P=0.0001). In contrast, a significant decrease in protein content of FOXO1 (P=0.003) and FOXO3a (P=0.006) was observed between the training and control groups.
Conclusion: It seems based on the results HIIT with increasing and regulating PKB leads to a decrease and inactivation of FOXO1 and FOXO3a proteins in the hearts of diabetic subjects. Inhibition of these proteins can prevent excessive cardiac autophagy in diabetic subjects.