title: Reliability of H-reflex in vastus lateralis and vastus medialis muscles during passive and active isometric conditions.
abstract: OBJECTIVE
  This study aimed to evaluate the modulation and reliability of the vastus medialis (VM) and vastus lateralis (VL) H-reflexes in both passive and active conditions.
  
  
  METHODS
  Recruitment curves of VM and VL H-reflexes and M-waves at rest and during muscle contraction (30% of maximal voluntary contraction) were performed for 12 healthy males and were then repeated after 1 h, 1 day and 1 week. The maximal H-reflexes of each muscle were normalized to their respective maximal M-waves (H/M ratio) and absolute (CV) and relative (ICC) reliability were calculated.
  
  
  RESULTS
  The H-reflex was potentiated in active compared to passive condition and a higher H-reflex occurrence (12 vs. 10 subjects) and amplitude (≈+150%) was found for the VM compared to the VL in active condition. The intra- (ICChour = 0.97) and inter-day (ICCday = 0.92; ICCweek = 0.92) reliability was poor for the passive VM H/M ratio due to high within-subject variations (CVhour = 52.2%; CVday = 69.8%; CVweek = 60.9%) whereas for the active condition the reliability, especially intra-day, was good (ICChour = 0.93 and CVhour = 12%; ICCday = 0.86 and CVday = 14.5%; ICCweek = 0.79 and CVweek = 19.7%).
  
  
  CONCLUSIONS
  This study showed differential modulation of the H-reflex between vasti muscles of the quadriceps and a higher occurrence and reliability for the active VM H-reflex. One can therefore conclude that it seems more appropriate to evoke quadriceps VM H-reflex (rather than VL) during an isometric muscle contraction.
authors.affiliation: Laboratory "Motricité, Interactions, Performance" (EA 4334), UFR STAPS Nantes, University of Nantes, 25 bis Boulevard Guy Mollet, BP 72206, 44322, Nantes Cedex 3, France.
authors.forename: Valentin
authors.initials: V
authors.lastname: Doguet
authors.forename: Marc
authors.initials: M
authors.lastname: Jubeau
mesh_terms: D000328:Adult; D004576:Electromyography; D006181:H-Reflex / Q000502:physiology*; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology*; D008297:Male; D052097:Quadriceps Muscle / Q000502:physiology*; D015203:Reproducibility of Results; D055815:Young Adult
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