The H-reflex modulation in lying and a semi-reclining (sitting) position

I. A. Al-Jawayed, M. Sabbahi, B. R. Etnyre, Scott Hasson

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


Objective: The purpose of this study was to compare motor pool excitability as measured by the H-reflex during lying prone and sitting in a semi-reclining position. Design and method: Twelve volunteer subjects were measured for maximum M-wave and H-wave during sitting and prone lying to determine an H/M ratio. Latency of each H-reflex was also measured. H-reflex responses were recorded during a control and a vibration condition in the two positions. A double-stimuli H-reflex recovery curve was also plotted for each subject in each relaxed position of sitting and lying. Results: No significant differences were observed between the prone lying and sitting positions for the any of the variables measured. Conclusions: The present results showed no difference in H-reflex responses between sitting or lying and it is suggested that the subject/patient should be tested in a position which is most comfortable.

Original languageEnglish (US)
Pages (from-to)2044-2048
Number of pages5
JournalClinical Neurophysiology
Issue number12
StatePublished - Dec 1 1999


  • EMG
  • H-reflex
  • Methods
  • Recovery curve

ASJC Scopus subject areas

  • Sensory Systems
  • Neurology
  • Clinical Neurology
  • Physiology (medical)


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