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[Purpose]: We examined mRNA levels of MyoD and myogenin in rat skeletal muscle after a single session of treadmill running. [Subject]: A total of 26 male Sprague-Dawley rats aged 4 weeks were used in this study. [Methods]: Rats were run on a 16° decline for 30 min. Treadmill speeds were 0, 16, 20, 24 and 28 m/min. At 72 h post-exercise, soleus (SOL) and extensor digitorum longus (EDL) muscles were extracted. The expression of MyoD and myogenin MRNA were analyzed by reverse transcription polymerase chain reaction (RT-PCR) and quantitative RT-PCR. [Results]: MyoD and myogenin mRNA expression were detected in all groups. Significant differences in myogenin levels were apparent in SOL between 16 m/min and 28 m/min. MyoD levels in SOL at 16, 24, 28 m/min were lower, while myogenin levels at 20, 24 and 28 m/min were higher, when compared with the 0 m/min group, although significant differences were not seen. [Conclusion]: These results suggest that a single session of exercise has little effect on proliferation of satellite cells, or myotube production.  Copyright (c) 2009 by the Society of Physical Therapy Science

MyoD and Myogenin mRNA Levels after Single Session of Treadmill Exercise in Rat Skeletal Muscle