Inhibitory Effect of Pain-Eliciting Transcutaneous Electrical Stimulation on Vibration-Induced Finger Flexion Reflex in the Human Upper Limb

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  • Takakura N.
    Hanada College: Japan School of Acupuncture, Moxibustion and Physiotherapy Institute of Foundation for Oriental Medicine Research Second Department of Physiology, Showa University School of Medicine
  • Yajima H.
    Hanada College: Japan School of Acupuncture, Moxibustion and Physiotherapy Institute of Foundation for Oriental Medicine Research
  • Homma I.
    Institute of Foundation for Oriental Medicine Research Second Department of Physiology, Showa University School of Medicine

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We studied the effects of non-pain transcutaneous electrical stimulation (TES) and pain-eliciting TES on vibration-induced finger flexion reflex (VFR) in 12 healthy volunteers. Tonic finger flexion reflex in the upper limb was induced by the application of vibratory stimulation on the volar side of the middle fingertip in the right hand before and after TES. Non-pain TES or pain-eliciting TES was applied on the skin between the bases of the first and second metacarpals in the right hand dorsal area in a crossover design. Pain-eliciting TES inhibited VFRs significantly (Fisher's PLSD, p < 0.01), compared to those of the time-control group during and after TES. VFRs were reduced approximately to 63.8% and 78.6% of prestimulation flexion force during and after pain-eliciting TES, respectively. Nonpain TES did not inhibit VFR. These results suggest that pain-conducting afferent fibers have inhibitory neuronal connection over the ipsilateral reflex circuits of VFR in the upper limb.<br>

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