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30 August 2012

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

Manuel Rosety-RodriguezADE, Ignacio RosetyCD, Gabriel Fornieles-GonzalezAB, Antonio Jesus Diaz-OrdonezEF, Alejandra CamachoEF, Miguel Angel RosetyBF, Antonio PardoAB, Manuel RosetyEF, Ramon AlveroCD, Francisco Javier OrdonezDE

DOI: 10.12659/MSM.883343

Med Sci Monit 2012; 18(9): BR346-350

Abstract

Background: It is widely accepted that oxidative stress is associated with the physiopathology of type 2 diabetes mellitus. In fact, it has been pointed out as a therapeutic target in T2DM. Fortunately, several papers have reported that long-term training programs improved the antioxidant system in young and adult diabetic rats. Accordingly, this study was designed to assess the influence of a shorter training program in elderly diabetic fatty rats.
Material/Methods: Study subjects were 24 male homozygous Zucker diabetic fatty rats (Gmi, fa/fa) aged 18 weeks with an average weight of 370–450 g. After a 2-week period of environmental adaptation, animals were randomly distributed into the Exercised Group (n=12) that performed a 6-week swimming training protocol and the Sedentary Group (n=12). Animals were sacrificed under anesthesia 24 h after the last exercise session. Serum metabolic profile was determined. Total antioxidant status (TAS), MnSOD expression, glutathione status and ROS generation were assayed in gastrocnemius muscle.
Results: When compared with controls, exercised rats significantly improved their metabolic profile. Total antioxidant status (0.19±0.002 vs. 0.13±0.002 µg/mg protein; p<0.001) and MnSOD expression (8471±90 vs. 6258±102 U/µg protein; p=0.003) were also increased in exercised rats.
Conclusions: A 6-week swimming training program improved the antioxidant system in elderly fatty diabetic rats. Fortunately, this improvement was enough to reduce oxidative damage, expressed as protein oxidation. A major finding of this study was that our training protocol lasted just 6 weeks, in contrast to longer protocols previously published.

Keywords: Rats, Zucker, Physical Conditioning, Animal - methods, Oxidative Stress - physiology, Muscle, Skeletal - metabolism, Metabolome, Insulin - blood, Glutathione - blood, Diabetes Mellitus, Type 2 - physiopathology, Cholesterol - blood, Body Weight, Blood Glucose - metabolism, Antioxidants - metabolism, Analysis of Variance, Reactive Oxygen Species - metabolism, Superoxide Dismutase - blood, Swimming, Triglycerides - blood

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750