Efecto del Entrenamiento Concurrente en las Fibras Musculares de Ratas Wistar Sometidas a Dietas Normal e Hipercalórica

To analyze the effects of concurrent training (CT) on the muscle fibers of Wistar rats submitted to standard and hypercaloric diets. In total, 40 rats were used, divided into 4 groups: Sedentary Group (GS); Exercise Group (GE), Obese Sedent ary Group (OS) and Obese Exercise Group (OE). The animals performed a CT protocol consisting of: muscle strength training and aerob ic training, carried out 3 times a week for 45 days. The smallest diameter of muscle fibers (MDF) was analyzed to evaluate muscle hypertrophy. It was observed that the OE group presented a significant decrease in MDF, compared to the OS group (OE=77.41 μm vs. OS=98.58 μm). In addition, the animals that performed CT demonstrated muscle hypertrophy (GE=74.39 μm vs. GS=72.13 μm). In conclusion, the CT with a standard diet promoted an increase in MDF while CT with a hypercaloric diet resulted in a decrease.

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