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An online physical activity program for German and Dutch adults delivered by SMS.


- candidate number12910
- NTR NumberNTR3489
- ISRCTNISRCTN wordt niet meer aangevraagd.
- Date ISRCTN created
- date ISRCTN requested
- Date Registered NTR19-jun-2012
- Secondary IDsCreate Tandem grant
- Public TitleAn online physical activity program for German and Dutch adults delivered by SMS.
- Scientific TitleA web-based physical activity intervention delivered by tailored mobile phone short text messages: A randomized controlled trial among German and Dutch adults.
- ACRONYMA web-based physical activity intervention delivered by tailored mobile phone short text messages: a randomized controlled trial among German and Dutch adults
- hypothesisTailored feedback delivered via SMS may be an effective way to improve exercise.

Exercise interventions may affect other health behaviors.

We expect to find the experimental group being more physically active and having a healthier lifestyle in general compared to the control group.
- Healt Condition(s) or Problem(s) studiedPhysical activity, Life style, Internet-interventions, Computer-tailoring, Mobile phone, Sms
- Inclusion criteria1. Being at least 18 years old;
2. Sufficient understanding of the German / Dutch language;
3. Computer / Internet literacy;
4. Valid mobile phone number.

Recruitment will take place through the distribution of flyers and posters in public places and by announcements on websites of the universities.
- Exclusion criteria1. Health complaints that bar respondents from regular physical exercise;
2. Visual impairment.
- mec approval receivedyes
- multicenter trialno
- randomisedyes
- masking/blindingSingle
- controlActive
- groupParallel
- Type2 or more arms, randomized
- Studytypeintervention
- planned startdate 1-sep-2012
- planned closingdate1-jan-2013
- Target number of participants260
- InterventionsSince eHealth interventions hold promise for increasing reach of people and health behavior change, a bilingual (German and Dutch), web-based tailored program for adults of the general population will be developed aimed at physical activity.

By use of questionnaires, physical activity level, nutrition, alcohol intake and smoking behavior will be assessed, in addition to multiple health behavior cognitions (e.g., transfer) and demographic factors.

Using an RCT, our respondents will be randomized among two groups: The control group will receive the questionnaire four times (at baseline and afterwards once per week plus 1 general short message) whereas the experimental group will, additionally, receive tailored short messages on their mobile phones concerning physical activity. The messages will be based on different social-cognitive exercise-specific factors, such as self-efficacy, planning and motivation.

Data for the analyses will come from the two subsamples one in Germany and one in the Netherlands.
- Primary outcomeThe main aim of this study is to assess the effectiveness of a physical exercise intervention delivered to German and Dutch adults via mobile telephone short messages service (SMS).

We aim to anwer the following research questions: Do individuals profit from receiving additional tailored text message prompts in terms of changes in physical activity behavior compared to controls?
- Secondary outcomeSecondly, it will be investigated whether and how an exercise intervention (a single health behavior intervention) may affect other health behaviors and exercise specific conitions (i.e., planning, self-efficacy, intention).

Moreover, we aim to answer the following research questions: How feasible and usable are tailored text message prompts delivered via mobile phones in promoting physical activity? Do individuals profit from receiving additional tailored text message prompts in terms of changes in social cognitions compared to controls?
- TimepointsLevels of physical exercise, social cognitions (self-efficacy, intention, action plans), and other health behaviors (nutrition, alcohol intake, smoking) will be assessed at up to four measurement points:
T0 (baseline);
T1 (after one week);
T2 (after two weeks);
T3 (after three weeks).

Demographic variables (gender, age, marital status, educational level, height and weight) will be measured at T0. Height and weight will also be measured at T3.
- Trial web siteN/A
- statusplanned
- CONTACT FOR PUBLIC QUERIESM.Sc. Daniela Schulz
- CONTACT for SCIENTIFIC QUERIESM.Sc. Daniela Schulz
- Sponsor/Initiator Create (Collaborative Research and Training in the EHPS)
- Funding
(Source(s) of Monetary or Material Support)
Create (Collaborative Research and Training in the EHPS)
- PublicationsN/A
- Brief summaryThe main aim of this study is to assess the effectiveness of a physical exercise intervention delivered to German and Dutch adults via mobile telephone short messages service (SMS). Secondly, it will be investigated whether and how an exercise intervention may affect other health behaviors.

Using a randomized controlled trial, levels of exercise, social cognitions, and other health behaviors will be assessed at four measurement points among 260 adults. The experimental group will receive several mobile phone short messages tailored to exercise-specific cognitions from the HAPA and I-Change model.

By means of multivariate analyses, we expect to find the experimental group being more physically active and having a healthier lifestyle in general compared to the control group.
- Main changes (audit trail)
- RECORD19-jun-2012 - 1-jul-2012


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