Document Detail

Evaluation of a New Motion Sensor in Patients With Chronic Obstructive Pulmonary Disease.
MedLine Citation:
PMID:  22705466     Owner:  NLM     Status:  Publisher    
OBJECTIVE: To assess the criterion validity and reproducibility of the Power Walker 610 motion sensor (PW) in patients with chronic obstructive pulmonary disease (COPD). DESIGN: Cross-sectional study. SETTING: Outpatient Physiotherapy Clinic from an University Hospital. PARTICIPANTS: Thirty patients with COPD (17 male, FEV(1) 44±17%pred) were videotaped while performing two protocols: one including two slow and two fast 5-minute walks, and another including a circuit of activities of daily living (ADL). Concomitantly, patients wore two motion sensors: PW and SenseWear Armband (SAB). INTERVENTIONS: None. MAIN OUTCOME MEASURES: Step counting (SC), energy expenditure (EE), walking distance (WD), activity time (AT) and walking intensity (WI) registered by PW were compared to video and SAB as criterion methods. RESULTS: Correlations between PW and the criterion method were high for SC during slow and fast walking (r=0.79 and r=0.95) and for EE during fast walking (r=0.83). Correlation was more modest for EE during slow walking (r=0.65) and for WD and WI during both speeds (0.47<r<0.68). The agreement between methods was also good, according to Bland&Altman plots. The device was reproducible for registering SC, WD and EE during slow walking and for all variables during fast walking (ICC>0.79 for all). During the ADL circuit, PW underestimated AT by an average of 55% but provided an acceptable EE estimation in a group basis (average difference of 6% with SAB). CONCLUSIONS: In patients with COPD, PW is reproducible for most outcomes and highly valid for SC during slow and fast walking and EE during fast walking. The device's validity is more limited for EE during slow walking, and WD and WI at both speeds. Furthermore, during the performance of ADL, it significantly underestimates activity time but provides an acceptable estimation of EE in a group basis.
Thaís Sant'anna; Victoria Cristina Escobar; Andréa Daiane Fontana; Carlos Augusto Camillo; Nidia Aparecida Hernandes; Fabio Pitta
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-6-14
Journal Detail:
Title:  Archives of physical medicine and rehabilitation     Volume:  -     ISSN:  1532-821X     ISO Abbreviation:  -     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-6-18     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2985158R     Medline TA:  Arch Phys Med Rehabil     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 the American Congress of Rehabilitation Medicine. Published by Elsevier Inc. All rights reserved.
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