The effectiveness of a tailor-made intervention aiming at a healthy lifestyle and improving mental health among employees of two Dutch research institutes (WC2008-054)


Starting date: 01/12/2008
The study population of ‘VIP in Research’ consists of employees of a research institute.  These employees have been involved in the development of the intervention by making use of the ‘intervention mapping’ method. Input has been provided through individual interviews, focus group interviews and questionnaires.
Based on this input – combined with scientific literature- an intervention has been developed. The effectiveness of this intervention will be evaluated in this study. For this purpose, participants are divided in two groups to be able to compare.


This study consists of two phases.
In the first phase, the intervention will be developed using an intervention mapping protocol. By collaborating closely and structured with the target group and the management, changes of effectiveness of the intervention are expected to increase.
The second phase of this study aims at evaluating the intervention. This will be done by means of a randomized controlled trial (RCT). The study population consists of employees of a Dutch research institute. Participants will be assigned randomly to two different groups: a control group and an intervention group. Measurements will take place preceding the intervention (baseline, T0), directly following the intervention (after 6 months, T1), and after 12 months (T2).

Primary outcome variables are specific energy balance related behaviors (physical activity, fruit and vegetable intake and sedentary behavior) and work engagement. Secondary outcome variables are health related items such as BMI, waist circumference, mental health, vitality and work-related variables such as productivity and work ability. In addition to evaluating the effectiveness, a process evaluation will be performed.