A 6-week training program increased muscle antioxidant system in elderly diabetic fatty rats

Area of Science:

• Exercise Physiology
• Metabolic Disease Research
• Oxidative Stress Studies

Background:

• Oxidative stress is a key factor in type 2 diabetes mellitus (T2DM) pathophysiology.
• Exercise training is a recognized therapeutic target for T2DM.
• Previous studies demonstrated long-term training benefits in younger diabetic rats.

Purpose of the Study:

• To evaluate the impact of a shorter exercise intervention on elderly diabetic rats.
• To assess the influence of a 6-week swimming program on the antioxidant system and oxidative stress markers in aged Zucker diabetic fatty rats.

Main Methods:

• Utilized 24 male Zucker diabetic fatty rats, divided into exercised and sedentary groups.
• Implemented a 6-week swimming training protocol for the exercised group.
• Assessed serum metabolic profiles, total antioxidant status, MnSOD expression, glutathione status, and reactive oxygen species (ROS) generation in gastrocnemius muscle.

Main Results:

• Exercised rats showed significant improvements in metabolic profiles compared to controls.
• Total antioxidant status (TAS) was significantly increased in the exercised group (0.19±0.002 vs. 0.13±0.002 µg/mg protein; p<0.001).
• MnSOD expression was also significantly elevated in exercised rats (8471±90 vs. 6258±102 U/µg protein; p=0.003).

Conclusions:

• A 6-week swimming training program effectively enhanced the antioxidant system in elderly diabetic rats.
• The observed improvements in the antioxidant system were sufficient to mitigate oxidative damage, specifically protein oxidation.
• This study highlights the efficacy of a relatively short-term exercise protocol, contrasting with longer durations previously reported.