Recovery of standing balance and functional mobility after stroke.
OBJECTIVE
To examine the extent to which recovery of functional balance and mobility is accompanied by change in a few specific physiologic measures of postural control.


METHODS
Longitudinal prospective study.


METHODS
Laboratory setting in Ontario.


METHODS
Twenty-seven volunteers (age, 64.2+/-13.7y) undergoing 4 weeks of rehabilitation after stroke participated. At initial testing, patients were 32.7+/-18.4 days poststroke and exhibited a moderate level of motor recovery (lower-extremity and postural control, stages 3-4 on the Chedoke-McMaster Stroke Assessment Impairment Inventory).


METHODS
Not applicable.


METHODS
Three functional measures (Berg Balance Scale, Clinical Outcome Variables Scale, gait speed) were assessed. Three physiologic measures (electromyographic data of hamstrings and soleus muscles bilaterally, postural sway, arm acceleration) were taken while subjects stood quietly on a force platform and while they performed a rapid shoulder flexion movement of the nonparetic upper extremity.


RESULTS
After 1 month of rehabilitation, there was an overall significant improvement in all outcome measures (functional, physiologic). However, 10 patients failed to show any improvement in the electromyographic activation of hamstrings muscle on the paretic side in response to the rapid arm movement. These patients compensated by increasing the anticipatory activation of the nonparetic hamstrings.


CONCLUSIONS
After stroke, patients showed improvement in both physiologic and functional measures of balance and mobility over a 1-month period. We have identified some patients who may be using compensatory strategies to increase function. The factors that may predict those patients who are likely to use compensatory strategies awaits further study.
Garland
S Jayne
SJ
School of Physical Therapy, University of Western Ontario, Elborn College, London, Ontario N6G 1H1, Canada. jgarland@uwo.ca
Willems
Deborah A
DA
Ivanova
Tanya D
TD
Miller
Kimberly J
KJ
D000368:Aged; D004576:Electromyography; D005260:Female; D005684:Gait / Q000502:physiology; D006801:Humans; D007866:Leg; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D009068:Movement / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology; D017063:Outcome Assessment, Health Care; D010291:Paresis / Q000503:physiopathology / Q000534:rehabilitation; D004856:Postural Balance / Q000502:physiology*; D011187:Posture / Q000502:physiology*; D011446:Prospective Studies; D020127:Recovery of Function / Q000502:physiology*; D020521:Stroke / Q000503:physiopathology*; D000071939:Stroke Rehabilitation