Mechanisms underlying the training effects associated with neuromuscular electrical stimulation.
نویسندگان
چکیده
Although neuromuscular electrical stimulation (NMES) can increase the ability of muscle to exert force, the means by which this is accomplished seem to be different from those associated with voluntary exercise. The aim of the study was to determine whether the recruitment order of motor units elicited by over-the-muscle electrical stimulation is different from that achieved with voluntary activation of muscle. This difference was tested by comparing muscle twitch responses that were elicited by Hoffmann reflexes (H-reflexes) and direct motor responses (M-responses) and by examining the effect of submotor NMES on the twitch force associated with H-reflexes. Because H-reflexes 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 submotor NMES to the limbs of human subjects causes a faster-contracting population of motor units to be activated during a test H-reflex. Consequently, it seems that the application of NMES preferentially activates faster-contracting motor units, perhaps those that are normally only active at high exercise intensities under voluntary conditions.
منابع مشابه
Physiological considerations on Neuromuscular Electrical Stimulation (NMES) in muscular strength training Consideraţii fiziologice asupra utilizării electrostimulării neuro- musculare (ESNM) ca metodă de creştere a forţei musculare
Neuromuscular Electrical Stimulation (NMES) is a form of electrical stimulation that uses the application of electric current through electrodes, leading to the depolarization of the motoneuron, thus eliciting a muscular contraction (stimulation over the motor threshold). Although its beneficial effects on strength training are widely recognized, some controversial aspects concerning the underl...
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ورودعنوان ژورنال:
- Physical therapy
دوره 71 4 شماره
صفحات -
تاریخ انتشار 1991