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Impairments in Systems Underlying Control of Balance in COPD.
MedLine Citation:
PMID:  22116798     Owner:  NLM     Status:  Publisher    
ABSTRACT BACKGROUND:Although balance deficits are increasingly recognized in chronic obstructive pulmonary disease (COPD), little is known regarding the disordered subcomponents underlying control of balance. We aimed to determine the specific components of balance that are impaired in COPD and to investigate the association between balance and peripheral muscle strength and physical activity. METHODS:Balance, physical activity and lower extremity muscle strength were assessed in 37 patients with COPD and 20 age-matched healthy controls using the Balance Evaluation Systems Test (BESTest), the Physical Activity Scale for the Elderly (PASE), and an isokinetic dynamometer, respectively. A subset of subjects (20 COPD and 20 controls) underwent a second testing session in which postural perturbations were delivered using a lean-and-release system. RESULTS:Subjects with COPD (age 71 ± 7 yrs; FEV(1) 39 ± 16 percent predicted) exhibited significantly lower scores than controls (age 67 ± 9 yrs) on all of the BESTest subscales (all p < 0.001). In response to anterior perturbations, subjects with COPD showed a longer time to foot-off (p = 0.027), foot-contact (p = 0.018), and a longer duration anticipatory phase (p = 0.008) compared to controls. Muscle strength (p = 0.008) and self-reported physical activity (p = 0.033) explained 35% of the variance in balance in subjects with COPD. CONCLUSIONS:Individuals with COPD exhibit impairments in all balance subcomponents and demonstrate slower reaction times in response to perturbations. Deficits in balance are associated with reduced physical activity levels and skeletal muscle weakness.
Marla K Beauchamp; Kathryn M Sibley; Bimal Lakhani; Julia Romano; Sunita Mathur; Roger S Goldstein; Dina Brooks
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-11-23
Journal Detail:
Title:  Chest     Volume:  -     ISSN:  1931-3543     ISO Abbreviation:  -     Publication Date:  2011 Nov 
Date Detail:
Created Date:  2011-11-25     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0231335     Medline TA:  Chest     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
1Graduate Department of Rehabilitation Science, University of Toronto, Toronto, Canada;
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