Step into Motion: A randomized trial examining the relative efficacy of Internet vs. print-based physical activity interventions

Bess H. Marcus, Beth A. Lewis, David M. Williams, Jessica A. Whiteley, Anna E. Albrecht, John M. Jakicic, Alfred F. Parisi, Joseph W. Hogan, Melissa A. Napolitano, Beth C. Bock

Research output: Contribution to journalArticlepeer-review

46 Scopus citations


Over two-thirds of Americans access the Internet and therefore, the Internet may be an important channel for reaching the large population of sedentary individuals. The purpose of this paper is to describe the methods for a randomized controlled trial examining the efficacy of an Internet-based physical activity intervention relative to a print intervention that has been shown to be effective in previous trials. Specifically, 249 sedentary participants were randomized to receive one of three interventions: 1) Internet-based motivationally-tailored individualized feedback (Tailored Internet); 2) print-based motivationally-tailored individualized feedback (Tailored Print); or 3) physical activity websites currently available to the public (Standard Internet). Participants completed the 7-Day Physical Activity Recall interview, wore an objective physical activity monitor (i.e., ActiGraph), and participated in a treadmill fitness test at baseline, 6, and 12 months. The sample consisted of mostly women (84.2%) and Caucasian individuals (76.4%) who reported exercising an average of 21 min per week at baseline. This is the first study that we are aware of, that has examined the efficacy of a tailored Internet-based physical activity intervention. This study will have implications for the dissemination of Internet-based physical activity interventions.

Original languageEnglish (US)
Pages (from-to)737-747
Number of pages11
JournalContemporary Clinical Trials
Issue number6
StatePublished - Nov 2007

Bibliographical note

Funding Information:
This research was supported in part through a grant from the National Heart, Lung, and Blood Institute (#HL69866). The authors would like to acknowledge the contributions of Drs. Abby King, Deborah Tate, and Christopher Sciamanna in the design of this study. We would also like to thank Santina Ficara, B.S., Maureen Hamel, B.S., Jaime Longval, M.S., Kenny McParlin, and Susan Pinheiro, B.A., for their contributions to the conduct of this study. A special thank you to Barbara Doll and Shira Gray for their assistance with manuscript preparation.


  • Controlled clinical trial
  • Health promotion
  • Individually Tailored
  • Internet
  • Methodology
  • Physical activity
  • Social Cognitive Theory
  • Transtheoretical Model


Dive into the research topics of 'Step into Motion: A randomized trial examining the relative efficacy of Internet vs. print-based physical activity interventions'. Together they form a unique fingerprint.

Cite this