Document Detail


Estimating maximum work rate during incremental cycle ergometry testing from six-minute walk distance in patients with chronic obstructive pulmonary disease.
MedLine Citation:
PMID:  18760164     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVE: To develop a predictive equation to permit estimation of the maximum work rate (Wmax) achieved during an incremental cycle ergometry test from the measurement of 6-minute walk distance (6MWD) and its derivative, 6-minute walk work, which is the product of 6MWD and body weight. DESIGN: Cross-sectional observational study. SETTING: Outpatient physiotherapy and pulmonary physiology clinics in a tertiary hospital. PARTICIPANTS: Patients (N=50; 36 men) with chronic obstructive pulmonary disease (forced expiratory volume in 1 second [FEV(1)]=37%+/-11% of predicted). INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURES: Measurements were obtained of 6MWD and Wmax achieved during a laboratory-based, symptom-limited incremental cycle ergometry test. Linear regression analyses were performed using 6MWD, height, weight, and FEV(1) and using 6-minute walk work, height, and FEV(1) to determine their contribution to Wmax and to develop predictive equations for estimating Wmax. RESULTS: The equations derived to estimate Wmax using 6MWD and 6-minute walk work, respectively, were as follows: Wmax (W)=(0.122 x 6MWD)+(72.683 x height [m])-117.109 (r(2)=.67, standard error of the estimate [SEE]=10.8W) and Wmax (W)=17.393+(1.442 x 6-minute walk work) (r(2)=.60, SEE=11.8W). CONCLUSIONS: Wmax can be estimated from equations based on measurements of 6MWD or 6-minute walk work. The estimate of Wmax derived from either equation may provide a basis on which to prescribe cycle ergometry training work rates that comply with the current guidelines for pulmonary rehabilitation.
Authors:
Kylie Hill; Sue C Jenkins; Nola Cecins; Danielle L Philippe; David R Hillman; Peter R Eastwood
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Archives of physical medicine and rehabilitation     Volume:  89     ISSN:  1532-821X     ISO Abbreviation:  Arch Phys Med Rehabil     Publication Date:  2008 Sep 
Date Detail:
Created Date:  2008-09-01     Completed Date:  2008-09-23     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2985158R     Medline TA:  Arch Phys Med Rehabil     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1782-7     Citation Subset:  AIM; IM    
Affiliation:
Department of Pulmonary Physiology, Sir Charles Gairdner Hospital, Nedlands, Western Australia, Australia. Kylie.Hill@westpark.org
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MeSH Terms
Descriptor/Qualifier:
Aged
Aged, 80 and over
Analysis of Variance
Cross-Sectional Studies
Ergometry
Exercise Test*
Female
Forced Expiratory Volume / physiology
Humans
Linear Models
Male
Middle Aged
Oximetry
Oxygen Consumption / physiology
Prospective Studies
Pulmonary Disease, Chronic Obstructive / physiopathology*
Walking / physiology*

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


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