title: The relation between limb loading and control parameters of gait initiation in persons with stroke.
abstract: OBJECTIVE
  This study investigated the relation between limb loading and selected characteristics of gait initiation in patients after stroke.
  
  
  METHODS
  Thirteen patients attending a rehabilitation clinic volunteered for the study.
  
  
  METHODS
  For the description of clinical features, patients were divided into two groups dependent on the amount of body weight shared by the involved limb during stance before gait initiation.
  
  
  METHODS
  Patients performed six trials of gait initiation with either their involved or noninvolved limb on a force platform. Peak ground reaction forces and bilateral tibialis anterior and gastrocnemius electromyographic (EMG) activity were used for group comparison.
  
  
  RESULTS
  All patients showed the correct loading and unloading characteristics in the vertical and medial-lateral direction during gait initiation. Strong correlations were noted between initial limb loading and ground reaction forces during gait initiation (r = .79 to .95). Changes in ground reaction forces were significantly less (p < .001) for those patients who demonstrated decreased weight bearing on their involved limb before gait initiation. These patients were also unable to generate forward momentum, as evidenced by the fore-aft ground reaction force, with the involved limb. For all patients, increased gastrocnemius activity was noted in the stance (noninvolved) limb. The data are further discussed in regard to the relationship of the interaction of bilateral EMG activity and ground reaction forces.
  
  
  CONCLUSIONS
  This study suggests that there is a correlation between symmetrical weight bearing and the ability to provide those forces that generate forward momentum in the initiation of gait.
authors.affiliation: Department of Physical Therapy, University of Florida, Gainesville, USA.
authors.forename: D
authors.initials: D
authors.lastname: Brunt
authors.forename: D W
authors.initials: DW
authors.lastname: Vander Linden
authors.forename: A L
authors.initials: AL
authors.lastname: Behrman
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002561:Cerebrovascular Disorders / Q000503:physiopathology*; D004576:Electromyography; D005260:Female; D005684:Gait / Q000502:physiology*; D006429:Hemiplegia / Q000503:physiopathology; D006801:Humans; D007866:Leg / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D016474:Weight-Bearing