Relationship among balance impairments, functional performance, and disability in people with peripheral vestibular hypofunction.
OBJECTIVE
Physical therapy interventions are often based on assumed relationships among impairments, functional performance, and disability. The purposes of this study were (1) to describe balance impairments, functional performance, and disability in subjects with unilateral peripheral vestibular hypofunction (UVH) and bilateral peripheral vestibular hypofunction (BVH), (2) to examine the relationship among these factors, and (3) to determine whether disability can be explained by commonly used tests of balance and functional performance.


METHODS
Participants were 85 subjects (mean age=62.5 years, SD=16.5) with UVH (n=41) or BVH (n=44) diagnosed by vestibular function tests and clinical examination.


METHODS
Each subject completed the Dizziness Handicap Inventory (DHI) to obtain a measure of disability. Functional performance was measured with a modified Timed Up & Go Test (TUG). Balance impairments were measured with computerized posturography and balance tests. Descriptive statistics, correlational analyses, and stepwise regressions were performed.


RESULTS
Subjects with BVH had poorer balance but similar TUG scores and perceived levels of disability, as compared with subjects with UVH. Weak to moderate correlations existed among balance measurements, TUG scores, and DHI scores. Balance impairments and TUG scores together explained 78% of the variance in DHI scores of the subjects with BVH, whereas balance impairments alone explained 13% of the variance in DHI scores of the subjects with UVH.


CONCLUSIONS
Balance impairments and functional performance appear to be more closely related to disability in individuals with BVH as compared with those with UVH. Clinical tests of balance impairments and functional performance appear to be useful in explaining disability.
Graduate Programs in Physical Therapy, MGH Institute of Health Professions, 101 Merrimac St, Boston, MA 02114, USA. kgillbody@partners.org.
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KM
Gill-Body
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Beninato
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Krebs
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D004185:Disability Evaluation; D004244:Dizziness / Q000209:etiology* / Q000503:physiopathology / Q000534:rehabilitation*; D005260:Female; D005684:Gait; D006801:Humans; D008297:Male; D008875:Middle Aged; D010808:Physical Examination; D026741:Physical Therapy Modalities / Q000379:methods*; D004856:Postural Balance / Q000502:physiology; D011187:Posture; D011597:Psychomotor Performance; D015203:Reproducibility of Results; D012720:Severity of Illness Index; D015837:Vestibular Diseases / Q000175:diagnosis* / Q000503:physiopathology / Q000534:rehabilitation*; D014724:Vestibular Function Tests / Q000379:methods