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Measuring walking speed in COPD: test-retest reliability of the 30-metre walk test and comparison with the 6-minute walk test
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Neuroscience, Physiotheraphy. Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Sciences, Respiratory Medicine and Allergology.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Neuroscience, Physiotheraphy.
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2011 (English)In: Primary Care Respiratory Journal, ISSN 1471-4418, E-ISSN 1475-1534, Vol. 20, no 4, 434-440 p.Article in journal (Refereed) Published
Abstract [en]

AIMS:

To examine test-retest reliability of the 30-metre walk test (30mWT) in patients with chronic obstructive pulmonary disease (COPD) and to compare the 30mWT with the 6-minute walk test (6MWT).

METHODS:

Forty-nine subjects with stable COPD were included. The 30mWT consists of walking at different walking intensities over a distance of 30 metres - self-selected speed (ss-30mWT) and maximal speed (ms-30mWT). The test was conducted twice and the time to walk 30 metres was recorded. The 6MWT was performed in duplicate on the same day.

RESULTS:

Test-retest reliability was high: intraclass correlation coefficient (ICC2.1) = 0.93 (95% CI 0.87 to 0.97) for maximal walking speed and 0.87 (95% CI 0.78 to 0.93) for self-selected walking speed. Both maximal and self-selected speed had a standard error of measurement (SEM) of 0.07 m/s and SEM% was 4.4 for maximal speed and 5.9 for self-selected speed. The correlation, criterion validity, between ms-30mWT and the 6MWT was r=0.78 (p<0.001). Heart rate, dyspnoea, exertion and oxygen saturation were more affected after the 6MWT than after the 30mWT (p<0.001).

CONCLUSIONS:

The 30mWT is a reliable submaximal test that is easy to perform and can be used to measure physical function (walking ability) in patients with COPD. It may be well suited for primary care settings.

Place, publisher, year, edition, pages
2011. Vol. 20, no 4, 434-440 p.
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:uu:diva-162963DOI: 10.4104/pcrj.2011.00082ISI: 000304279300022PubMedID: 21938352OAI: oai:DiVA.org:uu-162963DiVA: diva2:462181
Available from: 2011-12-06 Created: 2011-12-06 Last updated: 2017-12-08Bibliographically approved
In thesis
1. Assessing Physical Activity and Physical Capacity in Subjects with Chronic Obstructive Pulmonary Disease
Open this publication in new window or tab >>Assessing Physical Activity and Physical Capacity in Subjects with Chronic Obstructive Pulmonary Disease
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The overall aim of this thesis was to assess measurement properties of methods suitable for screening or monitoring of physical capacity and physical activity in subjects with chronic obstructive pulmonary disease (COPD), and to explore factors associated with physical activity levels.

Methods: Four observational studies were conducted. Participants in studies I-III (sample sizes) (n=49, n=15, n=73) were recruited from specialist clinics, and in study IV from a population-based cohort (COPD n=470 and Non-COPD n=659). Psychometric properties of methods assessing physical capacity (study I) and physical activity (study II) were investigated in laboratory settings. Daily physical activity and clinical characteristics were assessed with objective methods (study III) and with subjective methods (study IV).

Results: Physical capacity as measured by walking speed during a 30-metre walk test displayed high test-retest correlations (ICC>0.87) and small measurement error. The accuracy for step count and body positions differed between activity monitors and direct observations. In study III 92% of subjects had an activity level below what is recommended in guidelines. Forty five percent of subjects’ activity could be accounted for by clinical characteristics with lung function (22.5%), walking speed (10.1%), quadriceps strength (7.0%) and fat-free mass index (3.0%) being significant predictors. In study IV, low physical activity was significantly more prevalent in COPD subjects from GOLD grade ≥II than among Non-COPD subjects (22.4 vs. 14.6%, p = 0.016). The strongest factors associated with low activity in COPD subjects were a history of heart disease, OR (CI 95%) 2.11 (1.10-4.08) and fatigue, OR 2.33 (1.31-4.13) while obesity was the only significant factor in Non-COPD subjects, OR 2.26 (1.17-4.35).

Conclusion: The 30 meter walk test and activity monitors are useful when assessing physical capacity and physical activity, respectively in patients with COPD. Impaired physical activity in severe COPD is related to low lung function, low walking speed, low muscle strength and altered body composition, whereas comorbidities and fatigue are linked to insufficient physical activity in patients with moderately severe COPD.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2014. 64 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Medicine, ISSN 1651-6206 ; 982
Keyword
COPD, chronic obstructive pulmonary disease, physical activity, measurement properties, reliability, accuracy, validity, sedentary behavior, activity monitor, questionnaire, anthropometrics, comorbidity, fatigue
National Category
Physiotherapy
Research subject
Medical Science
Identifiers
urn:nbn:se:uu:diva-220602 (URN)978-91-554-8905-2 (ISBN)
Public defence
2014-05-09, Gunnesalen, Akademiska sjukhuset, ingång 10, Uppsala, 13:00 (Swedish)
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Available from: 2014-04-16 Created: 2014-03-17 Last updated: 2014-04-29

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Andersson, MikaelSundbom, AnnJohansson, HenrikEmtner, Margareta

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