Abstract:

Aerobic physical activity is known to induce skeletal muscle adaptation. Some genes, including MyoD, are known to have a major role in the process of muscle adaptation. Several studies has stated that the expression of MyoD increases during the aerobic activity process; however, the studies were carried out in a single bout. Studies on the effects of acute phase exercise (<2 weeks) are still rare, especially those regarding the difference effect of acute training phase at different times. This study was performed in 2018 at the Central Laboratory and Animal Physiology Laboratory, Faculty of Medicine, Universitas Padjadjaran. The aim of this study was to determine the different effects of MyoD gene expression in a two-week acute aerobic physical activity. The effects were measured in the skeletal muscle in day 3, 7, and 14 of the activity. Twenty four male rats (rattus novergicus) were divided into 4 groups. Those rats in the treatment groups were run on an animal treadmill (P1=3 days, P2=7 days, and P3=14 days). On the last day of ran, rats were sacrificed and the soleus and gastrocnemius muscles were dissected. The expression of the MyoD gene in both muscles was then amplified using reversed PCR and detected by agarose gel electrophoresis. This study showed that there were differencesin MyoD gene expression levels in both muscles and that the level increased with days of treatment, although it was statistically insignificant. This study concludes that the MyoD gene expression level is not significantly affected by an acute aerobic physical activity in certain periods (3, 7 and 14 days).

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