Document Type : Research Paper I Open Access I Released under CC BY-NC 4.0 license


1 Department of Physical Education and Sport Sciences, Aliabad Katoul Branch, Islamic Azad University, Aliabad Katoul, Iran.

2 Department of Physical Education and Sport Science, Yadegar-e-Imam Khomeini (RAH) Shahre-rey Branch, Islamic Azad University, Tehran, Iran.


Introduction: The Ubiquitin pathway is responsible for muscle atrophy; the Atrogin-1 or muscle atrophy F-box (MAFbx) and the muscle Ring-Finger protein-1 (MuRF1) are the important factors in this pathway. This study aimed to investigate the effect of endurance training on the intracellular content of proteins related to the Ubiquitin-Proteasome pathway in the left ventricular tissue of rats with type-2 diabetes.
 Methods: In this experimental study, 18 three-month-old male Sprague-Dawley rats with a mean weight of 270±20 grams were selected. Type-2 diabetes was induced in 12 rats by intraperitoneal injection of streptozotocin and nicotinamide solutions. These rats were randomly divided into two diabetic training and diabetic control groups. A healthy control group (six rats in each group) was also considered. The training group did endurance training four days a week according to the training program for eight weeks. Data were analyzed using one-way ANOVA and Tukey post hoc tests via SPSS software version 23.
Results: MAFbx protein content showed a significant change after eight weeks of endurance training (P=0.0001); Tukey's post hoc test showed that this significant change was between pairs of the diabetic training compared with diabetic control (decrease) groups (P=0.0001)  and diabetic training compared with the healthy control (increase) groups (P=0.004). MuRF1 protein content showed a significant decrease (P=0.0001); This reduction was significant between pairs of diabetic training compared with diabetic control groups (P=0.0001).
Conclusion: Endurance training can prevent atrophy and lead to proper left ventricular function by reducing the content of MAFbx and MuRF1 proteins in the heart of diabetic rats.


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