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The 6-min walk test in heart failure : is it a max or sub-maximum exercise test?

Jehn, Melissa and Halle, Martin and Schuster, Tibor and Hanssen, Henner and Weis, Michael and Koehler, Friedrich and Schmidt-Trucksäss, Arno. (2009) The 6-min walk test in heart failure : is it a max or sub-maximum exercise test? European journal of applied physiology, Vol. 107. pp. 317-323.

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Official URL: http://edoc.unibas.ch/dok/A6006721

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Abstract

The aim of the study is to compare the cardiorespiratory response during the 6-min walk test (6MWT) with a symptom-limited cardiopulmonary exercise test (CPET) in patients with varying degrees of heart failure. Thirty-seven patients with heart failure (New York Heart Association I-III) were asked to complete a 6MWT and a CPET on a cycle ergometer. Respiratory gases were measured during both the tests and patients were grouped into tertiles according to their VO(2peak) reached during the CPET prior to performing statistical analysis of all other respiratory parameters. Patients were grouped into the following tertiles: Group 1 (VO(2peak) <25.2 ml/kg per min, N = 13), Group 2 (VO(2peak) <17.5-25.2 ml/kg per min), and Group 3 (VO(2peak) > or =17.5 ml/kg per min). Despite the good overall correlation between 6MWT VO(2) and CPET VO(2peak) (r = 0.72, P > 0.001), significant differences were seen within Groups 1 and 3 (P > 0.05). In Group 1, 6MWT VO(2) was significantly lower compared with CPET VO(2peak), whereas Group 3 showed significantly higher 6MWT VO(2) compared with CPET VO(2peak). In conclusion, the use of the 6MWT to evaluate exercise capacity in patients with heart failure is highly dependent on the degree of functional impairment. In patients with advanced heart failure, the 6MWT elicits a maximum exercise response, whereas it only constitutes a sub-maximal exercise test in patients with mild heart failure and no functional limitations. This must be taken into consideration when using the 6MWT in large epidemiological studies to evaluate therapy outcome and clinical prognosis in patients with varying degrees of clinical disabilities.
Faculties and Departments:03 Faculty of Medicine > Departement Sport, Bewegung und Gesundheit > Bereich Sport- und Bewegungsmedizin > Sportmedizin (Schmidt-Trucksäss)
UniBasel Contributors:Schmidt-Trucksäss, Arno
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Springer
ISSN:1439-6319
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:24 May 2013 09:21
Deposited On:24 May 2013 09:00

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