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    Defining the Relationship between Average Daily Energy Expenditure and Field-Based Walking Tests and Aerobic Reserve in COPD

    Access Status
    Fulltext not available
    Authors
    Hill, Kylie
    Dolmage, T.
    Woon, L.
    Coutts, D.
    Goldstein, R.
    Brooks, D.
    Date
    2011
    Type
    Journal Article
    
    Metadata
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    Citation
    Hill, Kylie and Dolmage, Thomas E. and Woon, Lynda and Coutts, Debbie and Goldstein, Roger and Brooks, Dina. 2011. Defining the Relationship between Average Daily Energy Expenditure and Field-Based Walking Tests and Aerobic Reserve in COPD. Chest. 141 (2): pp. 406-412.
    Source Title
    Chest
    DOI
    10.1378/chest.11-0298
    ISSN
    00123692
    School
    School of Physiotherapy
    URI
    http://hdl.handle.net/20.500.11937/40077
    Collection
    • Curtin Research Publications
    Abstract

    Background: The aims of this study were to determine which tests of exercise capacity relate to average daily energy expenditure (DEE) and to quantify aerobic reserve during daily life in people with COPD. Methods: A cross-sectional study was undertaken in 26 people with COPD (16 men; FEV1, 50% ± 16%). Six-min walk distance (6MWD) and incremental shuttle walk distance (ISWD) measures were collected, and peak oxygen uptake (Vo2 peak) was measured during a symptom-limited ramp cycle ergometry test. The SenseWear Armband was worn during the waking hours for 4.4 ± 1.1 days to measure DEE. The intensity at which activities of daily living were undertaken was expressed as a percentage of Vo2 peak. Results: DEE was associated with 6MWD (r = 0.40, P = .046) and ISWD (r = 0.52, P = .007) but not Vo2 peak (mL/kg per min) (r = 0.07, P = .74). Stronger associations were observed between DEE and the body weight-walking distance product for the 6MWD (r = 0.73, P < .001) and ISWD (r = 0.75, P < .001). The average intensity of daily activity was equivalent to 58% ± 11% of Vo2 peak, leaving an average aerobic reserve of 42%. Conclusions: Both 6MWD and ISWD, but not Vo2 peak, were related to DEE. Because activities of daily living were performed at a high percentage of Vo2 peak, it may be more realistic to optimize habitual DEE in COPD by increasing the frequency or duration rather than the intensity of physical activity.

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