Effect of voluntary contraction with electrical stimulation antagonist muscle on agonist H-reflex

Tomofumi Yamaguchi, S. Tanabe, T. Watanabe, Y. Muraoka

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Objective: Hybrid exercise (HE) was designed to use the force generated by an electrically stimulated antagonist to provide resistance to a volitionally contracting agonist. The purpose of this study was to measure and compare the soleus H-reflex before and after HE or conventional resistance exercise (CRE). Methods: The experiments were carried out in 18 healthy subjects (5 men and 13 women; 19-30 yr), who were divided into 2 groups of 9 for each protocol (HE or CRE). The exercise sessions lasted for 15 consecutive minutes. The soleus Hmax/Mmax was measured before and after the HE or the CRE. Results: In the HE group, although there was no significant difference, the soleus Hmax/Mmax after the exercise increased compared with before the exercise (54.7 ± 10.2% to 59.0 ± 14.5%). On the other hand, the soleus Hmax/Mmax decreased in the CRE group (61.8 ± 14.9% to 55.7 ± 16.1%). In the rate of change of the soleus Hmax/Mmax, the result for the HE group was significantly higher than in the CRE group (108.0 ± 11.7% and 89.1 ± 8.0%, respectively) (p < 0.001). Conclusion: Our results show a clear difference of the neurophysiological mechanism between HE and CRE. Thus, HE might not be an alternative method for CRE.

Original languageEnglish
Pages (from-to)251-255
Number of pages5
JournalElectromyography and Clinical Neurophysiology
Issue number4-5
Publication statusPublished - 07-2007
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physiology
  • Clinical Neurology
  • Physiology (medical)


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