Document Detail


Estimating cardiorespiratory fitness in well-functioning older adults: treadmill validation of the long distance corridor walk.
MedLine Citation:
PMID:  16420209     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVES: To determine criterion validity of the 400-m walk component of the Long Distance Corridor Walk (LDCW) and develop equations for estimating peak oxygen consumption (VO2) from 400-m time and factors intrinsic to test performance (e.g., heart rate (HR) and systolic blood pressure (SBP) response) in older adults. DESIGN: Cross-sectional validation study. SETTING: Gerontology Research Center, National Institute on Aging, Baltimore, Maryland. PARTICIPANTS: Healthy volunteers (56 men and 46 women) aged 60 to 91 participating in the Baltimore Longitudinal Study of Aging between August 1999 and July 2000. MEASUREMENTS: The LDCW, consisting of a 2-minute walk followed immediately by a 400-m walk "done as quickly as possible" over a 20-m course was administered the day after maximal treadmill testing. HR and SBP were measured before testing and at the end of the 400-m walk. Weight, height, activity level, perceived effort, and stride length were also acquired. RESULTS: Peak VO2 ranged from 12.2 to 31.1 mL oxygen/kg per minute, and 400-m time ranged from 2 minutes 52 seconds to 6 minutes 18 seconds. Correlation between 400-m time and peak VO2 was -0.79. The estimating equation from linear regression included 400-m time (partial coefficient of determination (R2)=0.625), long versus short stride (partial R2=0.090), ending SBP (partial R2=0.019), and a correction factor for fast 400-m time (<240 seconds; partial R2=0.020) and explained 75.5% of the variance in peak VO2 (correlation coefficient=0.87). CONCLUSION: A 400-m walk performed as part of the LDCW provides a valid estimate of peak VO2 in older adults. Incorporating low-cost, safe assessments of fitness in clinical and research settings can identify early evidence of physical decline and individuals who may benefit from therapeutic interventions.
Authors:
Eleanor M Simonsick; Ellen Fan; Jerome L Fleg
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Intramural; Validation Studies    
Journal Detail:
Title:  Journal of the American Geriatrics Society     Volume:  54     ISSN:  0002-8614     ISO Abbreviation:  J Am Geriatr Soc     Publication Date:  2006 Jan 
Date Detail:
Created Date:  2006-01-19     Completed Date:  2006-04-07     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  7503062     Medline TA:  J Am Geriatr Soc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  127-32     Citation Subset:  IM    
Affiliation:
Clinical Research Branch, National Institute on Aging, Baltimore, Maryland 21225, USA. simonsickel@mail.nih.gov
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MeSH Terms
Descriptor/Qualifier:
Aged
Aged, 80 and over
Algorithms
Blood Pressure / physiology
Cardiovascular Physiological Phenomena*
Exercise Test*
Female
Heart Rate / physiology
Humans
Male
Middle Aged
Oxygen Consumption / physiology*
Physical Fitness / physiology*
Reference Values
Reproducibility of Results
Respiratory Physiological Phenomena*
Walking / physiology*

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


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