title: Effect of visual feedback information on isometric contraction of forearm flexor muscles in men and women after ischemic stroke.
abstract: The aim of this study was to determine the effect of visual feedback information (VFI) on the isometric contraction of the forearm flexor muscles in men and women after an ischemic stroke when doing a physical load at 20% of strength.
  
  
  METHODS
  The study included healthy subjects (n=20) and subjects after ischemic stroke (n=20). The study was conducted in Lithuanian Sports University. The measurements of maximum voluntary strength (MVS) and accurate isometric contraction were performed using an isokinetic dynamometer Biodex System Pro 3.
  
  
  RESULTS
  The absolute errors of isometric contraction of the right arm muscles at 20% of MVS were similar in all the groups during the attempt with visual feedback information. The smallest absolute errors of the healthy subjects were 1.42±0.35 Nm when the task was performed with visual feedback and the greatest absolute errors were 4.69±0.95 Nm (P<0.01) while performing the task without visual feedback. Meanwhile, the smallest and greatest absolute errors of the subjects after ischemic stroke were 1.32±0.45 Nm and 5.05±0.63 Nm, respectively, while performing the task without visual feedback (P<0.01).
  
  
  CONCLUSIONS
  Maximum voluntary strength was greater in all the groups of men. The absolute errors of isometric contractions of the right and left arm muscles tended to increase in both the men and the women when there was no visual feedback information. The women and the men after an ischemic stroke produced greater absolute errors when performing the task with the right and left arm without visual feedback information than the healthy subjects.
authors: Faculty of Sports Biomedicine, Lithuanian Sports University, Lithuania. darbtoma@yahoo.com
authors: Tomas
authors: T
authors: Darbutas
authors: Vilma
authors: V
authors: Juodžbalienė
authors: Albertas
authors: A
authors: Skurvydas
authors: Gražina
authors: G
authors: Krutulytė
authors: Inesa
authors: I
authors: Rimdeikienė
authors: Marius
authors: M
authors: Brazaitis
mesh_terms: D000368:Aged; D056228:Feedback, Sensory; D005260:Female; D005542:Forearm / Q000503:physiopathology*; D006801:Humans; D007537:Isometric Contraction; D008297:Male; D018482:Muscle, Skeletal / Q000503:physiopathology*; D020521:Stroke / Q000503:physiopathology / Q000523:psychology; D000071939:Stroke Rehabilitation; D013647:Task Performance and Analysis