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Updated: Jun 24, 2026

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Moving from intention to behaviour: a randomised controlled trial protocol for an app-based physical activity

Lili L Kókai1, Diarmaid T Ó Ceallaigh2,3, Anne I Wijtzes4

  • 1Department of Public Health, Erasmus MC University Medical Center, Rotterdam, The Netherlands l.kokai@erasmusmc.nl.

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Summary

This study tests an app-based intervention for women with prior hypertensive pregnancy disorders to improve physical activity. The integrated behavior change model guides the intervention, aiming for sustained behavior change.

Keywords:
preventive medicinepublic healthsocial medicine

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Area of Science:

  • Public Health
  • Behavioral Science
  • Digital Health

Background:

  • Many physical activity interventions show limited or short-term efficacy due to insufficient theoretical basis.
  • This study addresses the need for theory-based interventions to promote sustained behavior change in physical activity.

Purpose of the Study:

  • To test the efficacy of an 8-week app-delivered intervention based on the integrated behavior change model.
  • To investigate the motivational, volitional, and automatic processes underlying behavior change in physical activity.
  • To evaluate the intervention's impact on physical activity levels and related health outcomes in women with prior hypertensive pregnancy disorders.

Main Methods:

  • A three-condition randomized controlled trial (information, motivation, action) delivered via a mobile app.
  • Participants (women with prior hypertensive pregnancy disorder) are randomized to one of the three conditions.
  • Primary outcome: weekly moderate-to-vigorous physical activity measured by activity tracker; secondary outcomes include resting heart rate, BMI, waist-hip ratio, cardiorespiratory fitness, and well-being.

Main Results:

  • Efficacy will be determined by available case analysis of primary and secondary outcomes.
  • Physical activity will be assessed at baseline, midpoint, immediately post-intervention, and at 3 and 12 months.
  • A process evaluation will assess program fidelity and acceptability.

Conclusions:

  • The study aims to provide evidence for an effective, theory-based digital intervention to promote sustained physical activity.
  • Findings will inform the development of future interventions targeting behavior change processes for improved health outcomes.
  • Results will be disseminated through peer-reviewed publications and scientific conferences.