Original articleEvaluation of a New Motion Sensor in Patients With Chronic Obstructive Pulmonary Disease
Section snippets
Study Design and Participants
Thirty patients with COPD (17 men) with no exacerbation episodes for at least 3 months were recruited to take part in this cross-sectional study. All participants had taken part recently or were currently enrolled in programs of respiratory physiotherapy at the University Hospital of the State University of Londrina, Brazil. The patient's latest assessment of lung function (<6mo) performed by hospital staff was used to confirm COPD diagnosis and classify degree of obstruction according to
Results
All of the 30 recruited patients successfully completed the protocols. Because there was no difference between first and second walk in both speeds concerning almost all variables of interest (P>.170), we standardized to use only the first walk of each speed in the analysis. Regarding the number of steps, walking distance, and walking intensity, there was a statistical difference between the first and second slow walking (P<.002), although not of a clinically important difference (1.5%, 2%, and
Discussion
The present study showed that, in patients with COPD, although the PW had a somewhat limited validity to estimate walking distance, walking intensity, and energy expenditure during the slow walk, it was highly valid to register the number of steps. Additionally, it was reproducible not only for step counting, but also in the estimation of walking distance and energy expenditure in the slow walk. During the fast walk, the PW was reproducible concerning all variables and highly valid to estimate
Conclusions
In patients with COPD, the PW is reproducible for most outcomes and highly valid for step counting during slow and fast walking and energy expenditure estimation during fast walking. The device's validity is more limited for energy expenditure estimation during slow walking and walking distance and intensity at both speeds. Furthermore, during the performance of a circuit of ADLs, the device significantly underestimates activity time but provides an acceptable estimation of energy expenditure
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Supported by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)/Brazil (grant no. 302061/2010-0); Coordenação de Aperfeiçoamento de Pessoal de Nivel Superior (CAPES)/Brazil (grant nos. 05768419942 and 00847546993); and Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)/Brazil (grant no. 2010/03223-2).
No commercial party having a direct financial interest in the results of the research supporting this article has or will confer a benefit on the authors or on any organization with which the authors are associated.
Reprints are not available from the author.
In-press corrected proof published online on Jul 31, 2012, at www.archives-pmr.org.