[Effects of electroacupuncture at different frequencies on morphological changes of nervous tissues and electromyogram of skeletal muscles in the rat with injury of sciatic nerve].

Objective: To observe effects of electroacupuncture of different frequencies on morphological changes of nervous tissues and electromyogram (EMG) of skeletal muscles in regeneration,so as to find more proper parameters of electroacupuncture.

Methods: The nerve regeneration chamber was built after the sciatic nerve was transected, and acupuncture was given at "Huantiao" (GB 30) , "Zusanli" (ST 36) and "Sanyinjiao" (SP 6) at the affected side with different frequencies (5 Hz, 100 Hz), 30 min each time,once every other day, 3 time each week, for 20 weeks and a control group was set up for natural recovery. The nerve fibers were stained by silver dying and ultrastructures of nerve tissues were observed.