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Observations on the responses of muscle to mechanical and electrical stimuli.

Responses to mechanical and electrical stimuli have been studied in vastus medialis in four young adults. Percussion causes an immediate, br … to activation of intramuscular motor nerve fibres. This, too, is unaffected by nerve blockade. Some observations on EMG insertional activity provoked by needle movement are reported. It is concluded that muscle has a basic tendency to discharge repetitively when stimulated by mechanical means and that EMG insertional activity and the EMG response to percussio …