Condition category
Nutritional, Metabolic, Endocrine
Date applied
Date assigned
Last edited
Retrospectively registered
Overall trial status
Recruitment status
No longer recruiting
Publication status

Plain English Summary

Not provided at time of registration

Trial website

Contact information



Primary contact

Ms S.J.W. Robroek


Contact details

Erasmus Medical Centre
Department of Public Health
P.O. Box 2040
3000 CA
+31 (0)10 4087721

Additional identifiers

EudraCT number number

Protocol/serial number

ZonMw: 6230039

Study information

Scientific title


Study hypothesis

It is hypothesised that long-term electronic communication through the web and e-mails (the Health Portal) provides an efficient means of increasing exposure to advice on healthy behaviour and to facilitate adherence and sustainability.

Ethics approval

Approval received from the Medical Ethical Committee of the Erasmus Medical Center on 23rd July 2007 (ref: MEC-2007-113).

Study design

Randomised, single blinded, active controlled, parallel group trial

Primary study design


Secondary study design

Randomised controlled trial

Trial setting

Not specified

Trial type

Quality of life

Patient information sheet


Nutrition, health promotion, physical activity, worksite


1. Usual care control group:
Standard worksite health promotion program consisting of a questionnaire, a health check with a biometric assessment and access to a restricted part of the Health Portal on the Internet containing personal results on the questionnaire and health check and general information on health.

2. Intervention group:
On top of the standard worksite health promotion program the intervention group will have access to the personalised Health Portal on the Internet, which is built on four critical features:
2.1. Computer-tailored advice on physical activity and nutrition
2.2. Reports on individual progress in self-reported weight, body mass index, physical activity and fruit and vegetable consumption
2.3. Opportunity to contact professionals through e-mail
2.4. Continuous support and feedback through e-mail by a personal coach
After 12 months the monthly contact by a personal coach will be terminated, but access to the Health Portal will remain for another 12 months.

Data will be collected by means of a questionnaire at baseline, and after 12 and 24 months and a health check at baseline and after 24 months.

Intervention type



Not Specified

Drug names

Primary outcome measure

1. Change in (moderate and vigorous) physical activity level using the International Physical Activity Questionnaire, measured at baseline and after 12 and 24 months
2. Change in level of fruit and vegetable intake using the short Dutch Food Frequency Questionnaire, measured at baseline and after 12 and 24 months

Secondary outcome measures

1. Self-efficacy and perceived barriers on physical activity and fruit and vegetable consumption, measured at baseline and after 12 and 24 months
2. Change in self-reported saturated fat intake, measured at baseline and after 12 and 24 months
3. By using the SCORE system a risk profile on cardiovascular disease, consisting of systolic blood pressure, gender, smoking and total cholesterol level will be assessed, measured only at baseline and after 24 months
4. Body mass index, waist circumference and body fat percentage, measured only at baseline and after 24 months
5. Endurance, measured only at baseline and after 24 months

Overall trial start date


Overall trial end date


Reason abandoned (if study stopped)


Participant inclusion criteria

Eligibility criteria for individual workers are:
1. Paid employment
2. Working at least 12 hours a week
3. Being literate enough to read and understand simple e-mail and internet-based messages in the Dutch language

Participant type


Age group

Not Specified


Not Specified

Target number of participants


Participant exclusion criteria

Exclusion criteria for individual workers are:
1. Insufficient Dutch language skills
2. Working less than 12 hours a week

Recruitment start date


Recruitment end date



Countries of recruitment


Trial participating centre

Erasmus Medical Centre
3000 CA

Sponsor information


Erasmus Medical Centre (The Netherlands)

Sponsor details

Department of Public Health
P.O. Box 2040
3000 CA

Sponsor type

Hospital/treatment centre



Funder type

Research organisation

Funder name

The Netherlands Organisation for Health Research and Development (ZonMw) (The Netherlands)

Alternative name(s)

Funding Body Type

Funding Body Subtype


Results and Publications

Publication and dissemination plan

Not provided at time of registration

Intention to publish date

Participant level data

Not provided at time of registration

Basic results (scientific)

Publication list

2010 results in:
2012 results in:
2012 results in:
2013 results in:

Publication citations

  1. Results

    Robroek SJ, Brouwer W, Lindeboom D, Oenema A, Burdorf A, Demographic, behavioral, and psychosocial correlates of using the website component of a worksite physical activity and healthy nutrition promotion program: a longitudinal study., J. Med. Internet Res., 2010, 12, 3, e44, doi: 10.2196/jmir.1402.

  2. Results

    Robroek SJ, Lindeboom DE, Burdorf A, Initial and sustained participation in an internet-delivered long-term worksite health promotion program on physical activity and nutrition., J. Med. Internet Res., 2012, 14, 2, e43, doi: 10.2196/jmir.1788.

  3. Results

    Robroek SJ, Polinder S, Bredt FJ, Burdorf A, Cost-effectiveness of a long-term Internet-delivered worksite health promotion programme on physical activity and nutrition: a cluster randomized controlled trial., Health Educ Res, 2012, 27, 3, 399-410, doi: 10.1093/her/cys015.

  4. Results

    Robroek SJ, van Lenthe FJ, Burdorf A, The role of lifestyle, health, and work in educational inequalities in sick leave and productivity loss at work., Int Arch Occup Environ Health, 2013, 86, 6, 619-627, doi: 10.1007/s00420-012-0793-1.

Additional files

Editorial Notes