Duration: October 2013 – September 2014


The review of Sit Less Research 1.0 summarized the health risks of prolonged sitting. These health risks are independent of physical activity. Besides regular physical activity, it is recommended to sit less and stand up more often. The majority of sitting takes place at work, therefore workplaces are the perfect setting for interventions to decrease prolonged sitting.  Many devices to measure/increase physical activity are available, but it is unknown whether these devices can measure/decrease sitting behavior as well.


The aim of this study is to examine the validity of 10 different devices/applications in measuring physical activity (indicated as number of steps) and sedentary behavior in free living conditions during one workday.


In total, 75 employees with a primarily sedentary job will be wearing 10 activity trackers during one working day between 9.00 and 16.30 hr: Yamax Digiwalker SW-200, Omron, Fitbit Flex, Fitbit Zip, Misfit Shine, Jawbone Up, Nike Fuelband, Withings Pulse, Lumoback, Moves. The scores on steps and sitting behavior (if applicable) can be compared with the scores on the ActivPal (golden standard), by ICC’s and Bland Altman plots.

This project is a joined project with “The reliability and validity of ten different activity trackers”, in which the test-retest reliability of these devices will be examined in a movement lab-setting.


The expected output of these joined projects is a publication in a scientific journal.