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Andrianopoulos V, Holland AE, Singh SJ, Franssen FME, Pennings HJ, Michels AJ, Smeenk FWJM, Vogiatzis I, Wouters EFM, Spruit MA. Six-minute walk distance in patients with chronic obstructive pulmonary disease: Which reference equations should we use? Chron Respir Dis 2015; 12:111-9. [PMID: 25754856 DOI: 10.1177/1479972315575201] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The use of different 6-min walk distance (6MWD) reference equations probably results in different predicted 6MWD reference values. We wished to investigate the impact of several 6MWD reference equations for adults in patients with chronic obstructive pulmonary disease (COPD) and factors accountable for different 6MWD% predicted values. Twenty-two 6MWD reference equations were applied to a data set of 2757 patients with COPD. The predicted 6MWD reference value of Troosters and colleagues was used as the point of reference. Four out of 21 remaining equations resulted in comparable 6MWD% predicted, 16 equations resulted in significantly higher 6MWD% predicted and 1 equation resulted in a significantly lower 6MWD% predicted. Similar differences in 6MWD% predicted were observed after stratification by sex. Body mass index and global initiative for chronic obstructive lung disease (GOLD) stage classification demonstrated varying results within and between the groups; 9 out of 21 equations resulted in comparable 6MWD% predicted in underweight patients but only 1 equation demonstrated comparable result in obese. Eight equations in GOLD I, whilst 5 out of 21 equations in GOLD IV resulted in comparable 6MWD% predicted. Existing 6MWD reference equations will give varying results. The choice of 6MWD reference equation should consider the consistency of 6-min walk test operating procedures and at least be specific for the country/region of origin.
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Affiliation(s)
- Vasileios Andrianopoulos
- Department of Research and Education, CIRO+, Centre of Expertise for Chronic Organ Failure, Hornerheide, Horn, The Netherlands
| | - Anne E Holland
- Department of Physiotherapy, Alfred Health and La Trobe University, Melbourne, Australia
| | - Sally J Singh
- Department of Respiratory Medicine, University Hospitals of Leicester NHS Trust, Leicester, UK
| | - Frits M E Franssen
- Department of Research and Education, CIRO+, Centre of Expertise for Chronic Organ Failure, Hornerheide, Horn, The Netherlands
| | - Herman-Jan Pennings
- Department of Respiratory Medicine, Laurentius Hospital, Roermond, The Netherlands
| | - Arent J Michels
- Department of Respiratory Medicine, St Anna Hospital, Geldrop, The Netherlands
| | - Frank W J M Smeenk
- Department of Respiratory Medicine, Catharina Hospital, Eindhoven, The Netherlands
| | - Ioannis Vogiatzis
- Department of Physical Education and Sport Sciences, National and Kapodistrian University of Athens, Athens, Greece
| | - Emiel F M Wouters
- Department of Research and Education, CIRO+, Centre of Expertise for Chronic Organ Failure, Hornerheide, Horn, The Netherlands Department of Respiratory Medicine, Maastricht University Medical Centre (MUMC+), Maastricht, The Netherlands
| | - Martijn A Spruit
- Department of Research and Education, CIRO+, Centre of Expertise for Chronic Organ Failure, Hornerheide, Horn, The Netherlands
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