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Accuracy of three activity monitors in patients with chronic obstructive pulmonary disease: A comparison with video recordings
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. Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Sciences, Respiratory Medicine and Allergology.
2014 (English)In: COPD: Journal of Chronic Obstructive Pulmonary Disease, ISSN 1541-2555, E-ISSN 1541-2563, Vol. 11, no 5, 560-567 p.Article in journal (Refereed) Published
Abstract [en]

Low physical activity and sedentary behaviour characterise the lives of patients with chronic obstructive pulmonary disease (COPD). Using activity monitors, assessment of both aspects are possible, but many outcomes are not well validated. The aim of this study was to assess the accuracy and equivalency of three activity monitors regarding steps, body position and their ability to differentiate between periods of physical activity and inactivity.

Fifteen patients with COPD (8 females; median (interquartile range, IQR) age, 64 (59-69) years; forced expiratory volume in one second, 37 (28-48) % predicted; six-minute walk distance, 444 (410-519) m) were enrolled. The DynaPort ADL-monitor, the DynaPort MiniMod monitor and the SenseWear Armband Pro 3 monitor were assessed. Subjects performed a structured protocol alternating physical activity and inactivity while simultaneously wearing all three monitors and being video recorded.

The mean difference (limits of agreement) in step count from monitors compared to manual step count was -69 (-443 to 305) for the ADL-monitor, -19 (-141 to 103) for the MiniMod and -479 (-855 to -103) for the SenseWear Armband. Compared to the video, the sitting time was 97 (94-100) % when measured by the ADL-monitor and 121 (110-139) % by the MiniMod. Standing time was 114 (107-122) % when measured by the ADL-monitor and 68 (47-106) % by the MiniMod.

Activity monitors are not equivalent in their abilities to detect steps or body positions. The choice of monitor should be based on the particular outcome of interest. 

Place, publisher, year, edition, pages
2014. Vol. 11, no 5, 560-567 p.
Keyword [en]
Activity monitor, accuracy, validity, physical activity, sedentary, rehabilitation
National Category
Respiratory Medicine and Allergy
Research subject
Medical Science
Identifiers
URN: urn:nbn:se:uu:diva-220595DOI: 10.3109/15412555.2014.898033ISI: 000342056200012PubMedID: 24734942OAI: oai:DiVA.org:uu-220595DiVA: diva2:705746
Available from: 2014-03-17 Created: 2014-03-17 Last updated: 2017-12-05Bibliographically 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)
Opponent
Supervisors
Available from: 2014-04-16 Created: 2014-03-17 Last updated: 2014-04-29

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Andersson, MikaelJanson, ChristerEmtner, Margareta

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