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Related Experiment Video

Updated: May 20, 2026

Visualization of Intensity Levels to Reduce the Gap Between Self-Reported and Directly Measured Physical Activity
05:59

Visualization of Intensity Levels to Reduce the Gap Between Self-Reported and Directly Measured Physical Activity

Published on: March 7, 2019

Randomized controlled trial testing an internet physical activity intervention for sedentary adults.

Lucas J Carr1, Shira I Dunsiger, Beth Lewis

  • 1Department of Kinesiology, East Carolina University, Greenville, NC 27858, USA. carrl@ecu.edu

Health Psychology : Official Journal of the Division of Health Psychology, American Psychological Association
|July 25, 2012
PubMed
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This study enhanced an internet program for physical activity (PA) and found it initially increased PA compared to standard websites. However, these gains were not sustained long-term, highlighting the need for features promoting maintenance.

Area of Science:

  • Health behavior change
  • Digital health interventions
  • Physical activity promotion

Background:

  • Internet-based physical activity (PA) interventions show promise but have equivocal results.
  • Formative research was used to enhance a prior program (Step into Motion) for better dissemination.
  • The goal was to develop an internet program for physical activity (PA) interventions.

Purpose of the Study:

  • To enhance an existing internet-based physical activity intervention using formative research.
  • To incorporate theory-based features (Social Cognitive Theory) into an internet program.
  • To test the efficacy of an enhanced internet program (EI) against standard internet (SI) and publicly available websites.

Main Methods:

  • Focus groups identified 5 theory-targeted internet features: PA tracking, geographic mapping, discussion forum, exercise videos, and peer progress updates.

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  • A randomized controlled trial compared the enhanced internet (EI; N=25) program with standard internet (SI; N=28) and publicly available websites.
  • Participants (N=53) were randomized to either the EI or SI group.

    • Main Results:

    • The enhanced internet (EI) group significantly increased physical activity (PA) compared to the standard internet (SI) group at 3 months (186.0 min/wk vs. 57.3 min/wk; p=.03).
    • Between-group differences in PA were not significant at 6 months (176.8 min/wk vs. 133.5 min/wk; p=.44).
    • EI participants maintained PA from 3 to 6 months, while the SI group showed increased PA during this period.

    Conclusions:

    • The enhanced internet (EI) program was initially effective in improving physical activity (PA) levels compared to standard websites.
    • The observed differences in PA levels between groups were not maintained at the 6-month follow-up.
    • Future research should focus on identifying internet features that effectively promote long-term PA maintenance.