Content » Vol 47, Issue 6

Original report

Early post-stroke period: A privileged time for sensory re-weighting?

Isabelle V. Bonan, Florence Gaillard , Sophie Tasseel Ponche , Adelaïde Marquer, Pierre P. Vidal, Alain P. Yelnik
Physical and Rehabilitation Medicine Department, Centre Hospitalier Universitaire, 2 rue Henri le Guilloux, 35000 Rennes, France. E-mail:isabelle.bonan@chu-rennes.fr
DOI: 10.2340/16501977-1968

Abstract

Background: Shortly after stroke, patients exhibit excessive sensitivity to visual, proprioceptive and vestibular perturbations regarding balance control.
Objective: To evaluate the stability of this perceptual behaviour after stroke and test the relationships between sensory sensitivity and balance.
Methods: Thirty subjects following a hemispheric stroke (mean age 54.7 (standard deviation (SD) 10.6 years), 21 men, right hemisphere lesion = 13) and 30 control subjects (mean age 52.0 (SD 12.0), 14 men). Sensitivity to sensory perturbations was evaluated using the displacement of the centre of pressure during tendon vibration (proprioception score), optokinetic (visual score) and galvanic perturbations (vestibular score) while standing on a force-platform a mean of 2 months after stroke, and 1 month later. Balance and independence were evaluated using the Berg Balance Scale (BBS), Timed Up and Go test (TUG) and Barthel Index (BI).
Results: Global sensitivity to perturbations decreased (p = 0.001). Patients remained more sensitive to visual perturbation than did controls (p = 0.033). The Vestibular Score was correlated with BBS (Rs = –0.576, p = 0.006), TUG (Rs = 0.408, p = 0.045), BI (Rs = –0.481, p = 0.016); the Visual Score was correlated with BBS (Rs = –0.500, p = 0.019), TUG (Rs = 0.401, p = 0.049).
Conclusion: The initial months following stroke appear to be a period of individual perceptual motor adaptation. Sensory re-weighting is likely to be a major component of that process.

Lay Abstract

Comments

Do you want to comment on this paper? The comments will show up here and if appropriate the comments will also separately be forwarded to the authors. You need to login/create an account to comment on articles. Click here to login/create an account.
Advertisement