Abstract
BackgroundThe workplace is a setting where sedentary behaviour is highly prevalent. Accurately measuring physical activity and sedentary behaviour is crucial to assess the impact of behavioural change interventions. This study aimed to evaluate the reliability and criterion validity of the Occupational Sitting and Physical Activity Questionnaire (OSPAQ) and compare with data collected by accelerometers.MethodsA test-retest study was undertaken on 99 participants using the OSPAQ. Data were then compared to accelerometer records of 41 participants. Reliability was assessed by paired t-test and intra-class correlations (ICC) via a two-way mixed model based on absolute agreement. Difference and agreement were measured by comparison of mean self-reported data with accelerometer data using the Pearson’s correlation coefficient and Bland-Altman plots.ResultsThe ICCs for minutes spent sitting (0.66), standing (0.83) and walking (0.77) showed moderate to strong test-retest reliability. No significant differences were found between the repeated measurements taken seven days apart. Correlations with the accelerometer readings were moderate. The Bland-Altman plots showed moderate agreement for standing time and walking time but systematic variation for sedentary time.ConclusionThe OSPAQ appears to have acceptable reliability and validity measurement properties for application in the office workplace setting.
Highlights
IntroductionMeasuring physical activity and sedentary behaviour is crucial to assess the impact of behavioural change interventions
The workplace is a setting where sedentary behaviour is highly prevalent [1] and where many adults spend the majority of their waking hours [2]
Measuring physical activity and sedentary behaviour is crucial in order to assess the impact of health behaviour change interventions [11,12]
Summary
Measuring physical activity and sedentary behaviour is crucial to assess the impact of behavioural change interventions. Sedentary behaviour is associated with adverse health conditions such as obesity, cardiovascular disease, diabetes and cancer [4,5,6,7,8]. This presents an important environment for modifying employee behaviours [9,10] and a critical setting for the delivery of Accurately measuring physical activity and sedentary behaviour is crucial in order to assess the impact of health behaviour change interventions [11,12]. Increasingly objective measures of physical activity such as pedometers and accelerometers are becoming more common [13], as such devices are able to capture activities that can be difficult to quantify subjectively
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