Research Study Abstract

Effects of two web-based interventions promoting physical activity among older adults compared to a delayed intervention control group in Northwestern Germany: Results of the PROMOTE community-based intervention trial

  • Published on July 17, 2019

Regular physical activity (PA) is of central importance for healthy ageing. However, in Germany, only 42% of older adults currently reach the PA recommendations of the World Health Organization. The aim of this study was to examine the effects of two web-based interventions on PA in adults aged 65–75 years living in Northwestern Germany compared to a delayed intervention control group (CG). 589 older adults were randomized to one of the three groups. Participants in intervention group 1 (IG1) received access to a web-based intervention for ten weeks assisting them in self-tracking PA behavior. Participants in IG2 received the intervention of IG1 and additionally an activity tracker to objectively track PA behavior. To analyze differences in objectively measured moderate-to-vigorous PA and sedentary time between baseline and follow-up (12 weeks after baseline), linear mixed models were used. The interaction effects revealed a decrease in minutes spent on moderate-to-vigorous PA in bouts of 10 min by 11 min per week in IG1 participants (β = −11.08, 95% CI: (−35.03; 12.87)). In comparison, IG2 participants were 7 min more physically active at follow-up (β = 7.48, 95% CI: (−17.64; 32.60)). Sedentary time in bouts of 30 min per week increased in IG1 participants (β = 106.77, 95% CI: (−47.69; 261.23)) and decreased in IG2 participants at follow-up (β = −16.45, 95% CI: (−178.83; 145.94)). Participation in the two web-based interventions did not lead to significant increases in moderate-to-vigorous PA or significant decreases in sedentary time compared to the CG.

The study was registered at the German Clinical Trials Register (DRKS00010052, 07-11-2016).


  • Saskia Muellmann 1
  • Christoph Buck 1
  • Claudia Voelcker-Rehage 2
  • Inna Bragina 2
  • Sonia Lippke 3
  • Jochen Meyer 4
  • Manuela Peters 1,5
  • Claudia R. Pischke 1,6


  • 1

    Leibniz Institute for Prevention Research and Epidemiology – BIPS, Bremen, Germany

  • 2

    Institute of Human Movement Science and Health, Chemnitz University of Technology, Chemnitz, Germany

  • 3

    Jacobs University Bremen, Bremen, Germany

  • 4

    OFFIS – Institute for Information Technology, Oldenburg, Germany

  • 5

    Health Sciences Bremen, University of Bremen, Bremen, Germany

  • 6

    Institute of Medical Sociology, Centre for Health and Society, Medical Faculty, University of Duesseldorf, Duesseldorf, Germany


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