There is ambiguity on what measures to use to best identify physical activity and sedentary behaviors, respectively, and the agreement between different methods has not been evaluated in obstructive sleep apnea syndrome (OSAS) and obesity.
To study the level of agreement between an accelerometer (SenseWear armband, SWA), a self-report questionnaire (International Physical Activity Questionnaire, IPAQ), and a log book regarding moderate-to-vigorous physical activity (MVPA) and time spent sedentary, respectively, in patients with OSAS and obesity.
A prospective study including a psychometric evaluation of agreement between measurements.
39 obese patients (mean 36.1 kg/m2 SD 4.35) with moderate/severe OSAS (apneahypopnea- index (AHI) ≥15) were consecutively recruited from a sleep clinic in Sweden. All were treated with continuous positive airway pressure and waiting for a follow-up sleep registration.
Agreement between the measurements was limited. Using either method one might expect a mean difference of -47 minutes (SWA-IPAQ), and -32 minutes (SWA-log book), respectively. Also regarding sedentary time, the agreement was limited. The compared methods had a mean difference of 114 min (SWA-IPAQ), and 86 min (SWA-log book), respectively.
The small sample size might have an impact on how the results can be interpreted and generalized.
The results imply that the methods cannot be used interchangeably. A combination of accelerometer and daily log books seems to provide a detailed picture of physical activity and sedentary behavior.
Source: http://ptjournal.apta.org/cgi/content/short/ptj.20120123v1?rss=1
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