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Accelerometer- versus questionnaire-based assessment of physical activity and their changes over time in patients with COPD

Overview of attention for article published in International Journal of Chronic Obstructive Pulmonary Disease, April 2017
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Title
Accelerometer- versus questionnaire-based assessment of physical activity and their changes over time in patients with COPD
Published in
International Journal of Chronic Obstructive Pulmonary Disease, April 2017
DOI 10.2147/copd.s130195
Pubmed ID
Authors

Noriane A Sievi, Thomas Brack, Martin H Brutsche, Martin Frey, Sarosh Irani, Jörg D Leuppi, Robert Thurnheer, Malcolm Kohler, Christian F Clarenbach

Abstract

Physical activity (PA) is an important outcome parameter in patients with COPD regarding hospitalizations and mortality. Both objective assessment by accelerometers and self-evaluation by questionnaires were used in studies investigating PA in COPD. Whether self-reported questionnaires can adequately reflect PA and its changes over time compared to objective assessments has not been thoroughly investigated in COPD. In this COPD cohort study, we evaluated whether PA measured by accelerometer and its annual changes can also be assessed by self-reported questionnaires. In 178 COPD patients with at least two assessments of PA, the agreement between objectively measured and self-reported activity was analyzed by Bland-Altman plots. Daily PA was assessed by a triaxial activity monitor over 1 week and by the self-reported German PA questionnaire 50+. Comparison between the two methods of measurement revealed no convincing agreement with a mean difference and limits of agreement (±1.96 standard deviation [SD]) of time spent in at least moderate PA (>3 metabolic equivalent of task [MET]) of -77.6 (-340.3/185.2) min/day, indicating a self-reported overestimation of PA by the questionnaire. The mean difference and limits of agreement (±1.96SD) in the annual change of PA was 1.2 min/day (-208.2/282.6 min/day), showing also a poor agreement on an individual level. Evaluation of objectively measured and self-reported PA and their annual changes revealed no agreement in patients with COPD. Therefore, the evaluated questionnaire seems not helpful for measurement of PA and its changes over time.

Mendeley readers

Mendeley readers

The data shown below were compiled from readership statistics for 92 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Unknown 92 100%

Demographic breakdown

Readers by professional status Count As %
Student > Ph. D. Student 15 16%
Student > Master 15 16%
Student > Bachelor 12 13%
Researcher 9 10%
Student > Doctoral Student 6 7%
Other 14 15%
Unknown 21 23%
Readers by discipline Count As %
Medicine and Dentistry 23 25%
Nursing and Health Professions 19 21%
Sports and Recreations 7 8%
Computer Science 3 3%
Neuroscience 3 3%
Other 11 12%
Unknown 26 28%