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The impact of implementation intentions in changing complex health-related behaviours in order to prevent weight gain: the case of physical activity
ISRCTN ISRCTN81041724
DOI 10.1186/ISRCTN81041724
ClinicalTrials.gov identifier
EudraCT number
Public title The impact of implementation intentions in changing complex health-related behaviours in order to prevent weight gain: the case of physical activity
Scientific title
Acronym N/A
Serial number at source NTR620
Study hypothesis We hypothesised that forming implementation intentions (II) may increase levels of physical activity.
Lay summary
Ethics approval Received from the local medical ethics committee
Study design Randomised controlled parallel group trial
Countries of recruitment Netherlands
Disease/condition/study domain No condition, healthy person
Participants - inclusion criteria Adults aged between 18 and 65 years.
Participants - exclusion criteria Does not comply with the above inclusion criteria
Anticipated start date 01/03/2004
Anticipated end date 01/09/2005
Status of trial Completed
Patient information material
Target number of participants 709
Interventions Participants were randomly assigned to one of four conditions:
1. Control group
2. Forming single implementation intentions for walking
3. Forming implementation intentions for self-selected activities
4. Forming repeated implementation intentions for self-selected activities

At the end of the pretest questionnaire, all participants were asked to increase their physical activity with at least two hours per week. The participants in the II groups (group 2, 3 and 4) were additionally asked to write down:
1. What activity they were planning to do
2. What day(s) they were planning to do this activity
3. When they were planning the activity (e.g. before or after work)
4. Where they would do the selected activity (e.g. in the park)
5. What time they would spent doing the activity
This exact procedure was employed at three moments for participants in the repeated II condition (group 4) and at pretest with respect to walking instead of self-selected activities for the single II for walking group (group 2). Forming implementation intentions took about ten minutes.
Primary outcome measure(s) Post-tests took place two weeks, three months and six months post-intervention and included measures of body mass index (BMI), physical activity, and cognitions.
Secondary outcome measure(s) No secondary outcome measures
Sources of funding The Netherlands Organisation for Health Research and Development (ZonMw) (The Netherlands)
Trial website
Publications
Contact name Dr  Emely  de Vet
  Address Erasmus Medical Center
Department of Public Health
P.O. Box 2040
  City/town Rotterdam
  Zip/Postcode 3000 CA
  Country Netherlands
  Tel +31 (0)10 4638460
  Fax +31 (0)10 4638474
  Email e.devet@erasmusmc.nl
Sponsor Erasmus Medical Center (The Netherlands)
  Address P.O. Box 2040
  City/town Rotterdam
  Zip/Postcode 3000 CA
  Country Netherlands
Date applied 28/04/2006
Last edited 20/10/2008
Date ISRCTN assigned 28/04/2006
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