The effect of activity on skeletal muscle and neuromuscular junctions form in rat following temporary denervation.

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Our studies so far have reported that the muscle damage causes the temporary denervation. In the regeneration processes of the muscle fiber, the innervation form becomes multiple innervations. Then, it removes the surplus nerve terminals from muscle fiber, and it becomes the single innervation. It is considered that the selection and the elimination of the surplus nerve terminals affect the muscle fiber type. It may be presumed that the activity of the muscle plays pivotal roles in the affects the selection and elimination of the surplus nerve terminals. And it is further estimated that the muscle fiber also has interactive functions and sends signal to the nerve terminal in the process of regeneration. The purpose of this study was to investigate the effect of activity on neuromuscular junction form and Myosin Heavy Chain (MyHC) mRNA expression quantity following temporary denervation in rat skeletal muscle. The values from the group endurance-downhill-endurance training showed the increase from percentage of Type II a fiber and MyHCType I and MyHCType II A of mRNA .And activity following temporary denervation may have a role in the nerve conversion of the neuromuscular junction injury process.