Short-term effects of neuromuscular electrical stimulation during resistance training on the spinal reflex circuit

Ken'ichi Egawa, Motoyoshi Morishita, Shinichiro Shiozawa, Takayuki Tatewaki, Takeru Harada, Yoshinori Kitabatake, Yukio Oida, Takashi Arao

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    The purpose of the study was to examine the changes in soleus Hoffmann (H)- reflex and volitional (V)-wave after resistance training (RT) with and without neuromuscular electrical stimulation (NMES). Fourteen participants were randomly allocated to receive RT with NMES (RT+NMES, n = 7) or RT without NMES (RT, n = 7). Each participant trained for 10 sessions of right leg standing calf-raise for 2 weeks. For the RT+NMES group, NMES was applied to the tibial nerve using rectangular pulses (400 μsec duration, 75-Hz trains). Stimulation intensity was set at the maximal tolerable level. The H-reflex was elicited just above motor threshold during rest and during maximal voluntary isometric contraction (MVIC) conditions. The H-reflex and V-wave were normalized to the maximal motor response (Mmax). There was a significant interaction between time (pre/post) and group in the H-reflex during rest and during the MVIC condition (P = 0.05), but no significant difference in plantar torque, Mmax or Vwave. The H-reflex during rest decreased from 0.54 to 0.38 in the RT+NMES group (P = 0.01) but did not change in the RT group (from 0.48 to 0.47, P = 0.79). During MVIC, the H-reflex increased from 0.23 to 0.76 in the RT+NMES group (P = 0.02), but did not change in the RT group (from 0.44 to 0.58, P = 0.12). The results indicate that NMES-induced proprioceptive input during RT has an inhibitory effect in the resting muscle and an excitatory effect in the voluntarily activated muscle via spinal and/or supraspinal pathways.

    Original languageEnglish
    Pages (from-to)151-158
    Number of pages8
    JournalJapanese Journal of Physical Fitness and Sports Medicine
    Volume62
    Issue number2
    DOIs
    Publication statusPublished - 2013

    Keywords

    • Calf raise
    • Hoffmann reflex
    • Human
    • Soleus
    • V-wave

    ASJC Scopus subject areas

    • Orthopedics and Sports Medicine
    • Physical Therapy, Sports Therapy and Rehabilitation

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