Publikation

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

Wissenschaftlicher Artikel/Review - 10.04.2017

Bereiche
PubMed
DOI

Zitation
Sievi N, Brack T, Brutsche M, Frey M, Irani S, Leuppi J, Thurnheer R, Kohler M, Clarenbach C. Accelerometer- versus questionnaire-based assessment of physical activity and their changes over time in patients with COPD. Int J Chron Obstruct Pulmon Dis 2017; 12:1113-1118.
Art
Wissenschaftlicher Artikel/Review (Englisch)
Zeitschrift
Int J Chron Obstruct Pulmon Dis 2017; 12
Veröffentlichungsdatum
10.04.2017
eISSN (Online)
1178-2005
Seiten
1113-1118
Kurzbeschreibung/Zielsetzung

BACKGROUND AND OBJECTIVE
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.

METHODS
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+.

RESULTS
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.

CONCLUSION
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.