Document Detail

Validation of the StepWatch device for measurement of free-living ambulatory activity in patients with chronic obstructive pulmonary disease.
MedLine Citation:
PMID:  22003809     Owner:  NLM     Status:  MEDLINE    
This study examined the validity of the StepWatch activity monitor and the optimal number of monitoring days in patients with chronic obstructive pulmonary disease (COPD). StepWatch activity data were obtained from databases of two studies: one of patients with COPD who participated in a trial of two exercise persistence interventions (n = 17) and a second, cross-sectional study of activity in chronically healthy older adults (n = 60). Independent t tests, Pearson's correlations, and Bland-Altman plots were used to examine the activity data (total steps, activity intensity, and distribution of activity). Results indicated that patients with COPD registered 50% fewer total steps and had lower levels of walking intensity compared with chronically healthy older adults. Activity parameters had moderate-to-high correlations with disease severity, peak cycle workload, and physical functioning. More monitoring days were associated with greater measurement precision. This study provides preliminary evidence to support the validity of the StepWatch device for measuring free-living ambulatory physical activity in COPD.
Huong Q Nguyen; Robert L Burr; Dawn P Gill; Kim Coleman
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Validation Studies    
Journal Detail:
Title:  Journal of nursing measurement     Volume:  19     ISSN:  1061-3749     ISO Abbreviation:  J Nurs Meas     Publication Date:  2011  
Date Detail:
Created Date:  2011-10-18     Completed Date:  2011-11-23     Revised Date:  2013-03-18    
Medline Journal Info:
Nlm Unique ID:  9318902     Medline TA:  J Nurs Meas     Country:  United States    
Other Details:
Languages:  eng     Pagination:  76-90     Citation Subset:  IM; N    
University of Washington, Seattle, WA 98195, USA.
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MeSH Terms
Aged, 80 and over
Case-Control Studies
Disability Evaluation*
Ergometry / instrumentation*
Health Status
Middle Aged
Monitoring, Ambulatory / instrumentation*
Pulmonary Disease, Chronic Obstructive / rehabilitation*
Quality of Life
Reproducibility of Results
Severity of Illness Index
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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