title: The H-reflex modulation in lying and a semi-reclining (sitting) position.
abstract: 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.
  
  
  METHODS
  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.
authors.affiliation: Texas Woman's University, Houston 77030, USA.
authors.forename: I A
authors.initials: IA
authors.lastname: Al-Jawayed
authors.forename: M
authors.initials: M
authors.lastname: Sabbahi
authors.forename: B R
authors.initials: BR
authors.lastname: Etnyre
authors.forename: S
authors.initials: S
authors.lastname: Hasson
mesh_terms: D000328:Adult; D004558:Electric Stimulation; D004576:Electromyography; D005260:Female; D006181:H-Reflex / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011187:Posture / Q000502:physiology*; D011930:Reaction Time / Q000502:physiology