Abstract
Background There is ambiguity about what measures to use to best identify physical activity and sedentary behavior, and agreement between methods for measuring physical activity and sedentary behavior in people with obstructive sleep apnea syndrome (OSAS) and obesity has not been evaluated.
Objective The objective of this study was to examine the level of agreement between an accelerometer and a self-report questionnaire (International Physical Activity Questionnaire [IPAQ]) or a logbook for measuring time spent on moderate to vigorous physical activity and time spent sedentary in people with OSAS and obesity.
Design This prospective study was a psychometric evaluation of agreement between measurement methods.
Methods Thirty-nine people who were obese (body mass index: X̅=36.1 kg/m2, SD=4.35) and had moderate to severe OSAS (apnea-hypopnea index of ≥15) were consecutively recruited from a sleep clinic in Sweden. All were treated with continuous positive airway pressure and were waiting for a follow-up sleep evaluation.
Results Agreement between the measurement methods was limited. For physical activity, the mean difference between the accelerometer and the IPAQ was 47 minutes, and the mean difference between the accelerometer and the logbook was 32 minutes. Agreement was limited for sedentary time as well; the mean difference between the accelerometer and the IPAQ was 114 minutes, and the mean difference between the accelerometer and the logbook was 86 minutes.
Limitations The small sample size may affect the interpretation and generalizability of the results.
Conclusions The results imply that the methods cannot be used interchangeably. A combination of an accelerometer and a daily logbook seems to provide a detailed description of physical activity and sedentary behavior.
Footnotes
All authors provided concept/idea/research design, writing, data analysis, and project management. Ms Igelström and Dr Lindberg provided data collection. Dr Åsenlöf provided fund procurement. Dr Lindberg provided study participants. Ms Emtner and Dr Lindberg provided facilities/equipment. Ms Emtner and Dr Åsenlöf provided institutional liaisons. Ms Emtner, Dr Lindberg, and Dr Åsenlöf provided consultation (including review of manuscript before submission).
This study was approved by the Regional Ethical Review Board of Uppsala University.
A poster of this research was given at the Annual Congress of the European Respiratory Society; September 24–28, 2011; Amsterdam, the Netherlands.
This study was supported by the Swedish Research Council, Stockholm, Sweden, and by Caring Sciences Funding at the Faculty of Medicine, Uppsala University, Uppsala, Sweden.
- Received March 23, 2012.
- Accepted September 4, 2012.
