Mechanisms Underlying the Training Effects Associated with Neuromuscular Electrical Stimulation

  • Trimble M
  • Enoka R
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Although neummuscular electrical stimulation (NME) can increase the ability of muscle to exert force, the means by which this is accomplished seem to be dzferent fmm thost? associated with volunta y exerase. The aim of the study was to deter-mine whether the recruitment order of motor units elicited by over-the-muscle elec-trical stimulation is d@rentji-om that achieved with voluntay activation of m u -cle. This dz$eence was tested by comparing muscle twitch responses that were elicited by Ho$mann reflexes (H-reflexes) and direct motor responses (M-responses) and by examining the e$ect of submotor NMES on the twitch force associated with H-reflexes. Because H-reflees represent the summed activity of many motor units, in a manner that is consistent with volitional activation, variation in the time to peak twitch force indicates changes in the population of motor units that contribute to the response. The results demonstrated that the percutaneous application of sub-motor NMES to the limbs of human subjects causes a faster

Author-supplied keywords

  • Electromyography
  • Electrotherapy
  • Motor neurons
  • electrical stimulation
  • lVeuromuscular facilitation

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  • Mark H Trimble

  • Roger M Enoka

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