The effectiveness of a Web-based computer-tailored intervention on workplace sitting: a randomized controlled trial

De Cocker, Katrien and De Bourdeaudhuij, Ilse and Cardon, Greet and Vandelanotte, Corneel (2016) The effectiveness of a Web-based computer-tailored intervention on workplace sitting: a randomized controlled trial. Journal of Medical Internet Research, 18 (5):e96. pp. 1-14. ISSN 1439-4456

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BACKGROUND: Effective interventions to influence workplace sitting are needed, as office-based workers demonstrate high levels of continued sitting, and sitting too much is associated with adverse health effects. Therefore, we developed a theory-driven, Web-based, interactive, computer-tailored intervention aimed at reducing and interrupting sitting at work. OBJECTIVE: The objective of our study was to investigate the effects of this intervention on objectively measured sitting time, standing time, and breaks from sitting, as well as self-reported context-specific sitting among Flemish employees in a field-based approach. METHODS: Employees (n=213) participated in a 3-group randomized controlled trial that assessed outcomes at baseline, 1-month follow-up, and 3-month follow-up through self-reports. A subsample (n=122) were willing to wear an activity monitor (activPAL) from Monday to Friday. The tailored group received an automated Web-based, computer-tailored intervention including personalized feedback and tips on how to reduce or interrupt workplace sitting. The generic group received an automated Web-based generic advice with tips. The control group was a wait-list control condition, initially receiving no intervention. Intervention effects were tested with repeated-measures multivariate analysis of variance. RESULTS: The tailored intervention was successful in decreasing self-reported total workday sitting (time x group: P<.001), sitting at work (time x group: P<.001), and leisure time sitting (time x group: P=.03), and in increasing objectively measured breaks at work (time x group: P=.07); this was not the case in the other conditions. The changes in self-reported total nonworkday sitting, sitting during transport, television viewing, and personal computer use, objectively measured total sitting time, and sitting and standing time at work did not differ between conditions. CONCLUSIONS: Our results point out the significance of computer tailoring for sedentary behavior and its potential use in public health promotion, as the effects of the tailored condition were superior to the generic and control conditions. TRIAL REGISTRATION: NCT02672215; (Archived by WebCite at

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 15 Oct 2019 05:27
Last Modified: 31 May 2021 00:55
Uncontrolled Keywords: sedentary behavior; computer tailoring; employees; activPAL; sitting time; randomized controlled trial
Fields of Research (2008): 11 Medical and Health Sciences > 1117 Public Health and Health Services > 111799 Public Health and Health Services not elsewhere classified
11 Medical and Health Sciences > 1106 Human Movement and Sports Science > 110699 Human Movement and Sports Science not elsewhere classified
Fields of Research (2020): 42 HEALTH SCIENCES > 4299 Other health sciences > 429999 Other health sciences not elsewhere classified
42 HEALTH SCIENCES > 4207 Sports science and exercise > 420799 Sports science and exercise not elsewhere classified
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