Level of agreement between methods for measuring moderate-to-vigorous physical activity and sedentary time in people with obstructive sleep apnea and obesity
2013 (English)In: Physical Therapy, ISSN 0031-9023, E-ISSN 1538-6724, Vol. 93, no 1, 50-59 p.Article in journal (Refereed) Published
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.
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.
This prospective study was a psychometric evaluation of agreement between measurement methods.
Thirty-nine people who were obese (mean body mass index 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.
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.
The small sample size may affect the interpretation and generalizability of the results.
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.
Place, publisher, year, edition, pages
2013. Vol. 93, no 1, 50-59 p.
Medical and Health Sciences
IdentifiersURN: urn:nbn:se:uu:diva-181011DOI: 10.2522/ptj.20120123ISI: 000313320400006OAI: oai:DiVA.org:uu-181011DiVA: diva2:552657