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    The Effect of Pulmonary Rehability on Critical Walk Speed in Patients with COPD: A Comparison with Self-Paced Walks

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    Fulltext not available
    Authors
    Dolmage, T.
    Evans, R.
    Hill, Kylie
    Blouin, M.
    Brooks, D.
    Goldstein, R.
    Date
    2011
    Type
    Journal Article
    
    Metadata
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    Citation
    Dolmage, Thomas E. and Evans, Rachael A. and Hill, Kylie and Blouin, Maria and Brooks, Dina and Goldstein, Roger S. 2011. The Effect of Pulmonary Rehabilitation on Critical Walk Speed in Patients with COPD: A Comparison with Self-Paced Walks. Chest: pp. 1-32.
    Source Title
    Chest
    DOI
    10.1378/chest.11-1059
    ISSN
    00123692
    School
    School of Physiotherapy
    URI
    http://hdl.handle.net/20.500.11937/33729
    Collection
    • Curtin Research Publications
    Abstract

    Background: Walking is frequently used in the exercise rehabilitation of patients with COPD. Walking ability can be characterized by the two-parameter hyperbolic relationship between endurance and speed. One parameter, critical walk speed (s_critical), represents the maximum speed that can be endured indefinitely. The purpose of this study was to: (1) determine the effect of pulmonary rehabilitation on the critical speed and (2) compare the critical speed with the speed chosen during self-paced walking. Methods: We estimated critical speed in patients with COPD before and after rehabilitation. Patients completed four high-intensity constant-speed walk tests to intolerance on a 30-m course. The parameters of the hyperbolic relationship were determined using nonlinear regression of endurance on speed. Participants also completed self-paced walks: (1) for as long as they could, (2) at their “usual” and “fast” speeds, and (3) as a 6-min walk test. Results: Twelve participants (FEV1 [SD], 41 [16] % predicted; FEV1/FVC, 41 [12]) completed the study. At baseline, the critical speed (65 [12] m/min) was not significantly different from the self-paced, usual, or 6-min walk speeds (65 [12], 67 [14], and 63 [15] m/min, respectively). There was a significant increase in critical speed (6 [1-10] m/min) and 6-min speed (16 [10-21] m/min) after rehabilitation, without changes in the self-paced, usual, or fast speeds. Conclusions: Patients with COPD increase their critical walk speed after pulmonary rehabilitation. The pace chosen during common walk tasks is closely related to critical speed; this relationship is altered after rehabilitation.

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