title: The effect of optokinetic and galvanic vestibular stimulations in reducing post-stroke postural asymmetry.
abstract: OBJECTIVE
  To investigate the postural effect of 2 types of sensory stimulation in patients with a left hemispheric lesion (LHL) or right hemispheric lesion (RHL) compared with controls.
  
  
  METHODS
  35 patients (18 LHL, 17 RHL) and 27 controls (mean age 54.1 years), with a mean delay post-stroke of 3.0 months were enrolled. Subjects stood on a force platform and were stimulated on the left and right side by optokinetic (Okn) and galvanic vestibular (Gv) stimulation. Lateral displacement following stimulation toward the right and left directions was calculated as the mean position of the centre of pressure (CP) during the stimulation period minus the mean position at rest.
  
  
  RESULTS
  Postural asymmetry was reduced in LHL and RHL patients. CP displacement was higher in cases of left-sided stimulation in the RHL group compared with control subjects and LHL patients (respectively 2.8 and 2.4 times higher, group effect, p<0.001, group × direction of stimulation interaction, p=0.007). The magnitude of displacement under Okn significantly correlated with Gv in all cases (ρ=0.635, p<0.001).
  
  
  CONCLUSIONS
  Both GV and Okn stimulations can modulate hemiparetic's CP and their postural effects are correlated.
  
  
  CONCLUSIONS
  Results support a high level cortical postural effect of sensory stimulation on supramodal spatial network.
authors.affiliation: Physical Medicine and Rehabilitation Department, University Hospital, Faculty of Medicine, University of Rennes 1, 2, rue Henri Le Guilloux, 35033 Rennes Cedex 9, France. Electronic address: Isabelle.bonan@chu-rennes.fr.
authors.forename: I V
authors.initials: IV
authors.lastname: Bonan
authors.affiliation: Physical Medicine and Rehabilitation Department, University Hospital, Faculty of Medicine, University of Rennes 1, 2, rue Henri Le Guilloux, 35033 Rennes Cedex 9, France.
authors.forename: E
authors.initials: E
authors.lastname: Leblong
authors.affiliation: Physical Medicine and Rehabilitation Department, University Hospital, Faculty of Medicine, University of Rennes 1, 2, rue Henri Le Guilloux, 35033 Rennes Cedex 9, France.
authors.forename: S
authors.initials: S
authors.lastname: Leplaideur
authors.affiliation: Clinical Pharmacology Department, University Hospital, Faculty of Medicine, University of Rennes 1, Hôpital Pontchaillou, 2, rue Henri Le Guilloux, 35033 Rennes Cedex 9, France.
authors.forename: B
authors.initials: B
authors.lastname: Laviolle
authors.affiliation: PRM Department, GH Saint Louis Lariboisière F Widal AP-HP, Université Paris Diderot, 200 rue du Fbg St Denis, 75010 Paris, France; Physical Medicine and Rehabilitation Department, University Hospital, Faculty of Medicine, University of Amiens, avenue René Laënnec - Salouel, 80054 Amiens Cedex 1, France.
authors.forename: S
authors.initials: S
authors.lastname: Tassel Ponche
authors.affiliation: PRM Department, GH Saint Louis Lariboisière F Widal AP-HP, Université Paris Diderot, 200 rue du Fbg St Denis, 75010 Paris, France.
authors.forename: A P
authors.initials: AP
authors.lastname: Yelnik
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D005712:Galvanic Skin Response / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D017120:Nystagmus, Optokinetic / Q000502:physiology*; D010291:Paresis / Q000175:diagnosis / Q000503:physiopathology / Q000628:therapy; D010775:Photic Stimulation / Q000379:methods*; D004856:Postural Balance / Q000502:physiology*; D020521:Stroke / Q000175:diagnosis* / Q000503:physiopathology / Q000628:therapy*; D016896:Treatment Outcome; D014722:Vestibule, Labyrinth / Q000502:physiology*
keywords: Postural control; Rehabilitation; Sensory stimulation; Stroke