Examination of print and telephone channels for physical activity promotion: Rationale, design, and baseline data from Project STRIDE

Bess H. Marcus, Melissa A. Napolitano, Abby C. King, Beth A. Lewis, Jessica A. Whiteley, Anna E. Albrecht, Alfred F. Parisi, Beth C. Bock, Bernardine M. Pinto, Christopher A. Sciamanna, John M. Jakicic, George D. Papandonatos

Research output: Contribution to journalArticlepeer-review

39 Scopus citations


Background: Project STRIDE is a 4-year randomized controlled trial comparing two computer-based expert system guided intervention delivery channels (phone vs. print) for physical activity adoption and short-term maintenance among previously sedentary adults. Methods: Sedentary adults (n = 239) were randomized to one of the following (1) telephone-based, individualized motivationally-tailored feedback; (2) print-based, individualized motivationally-tailored feedback; (3) contact-control delayed treatment group (received intervention after 12 months as control). This paper: (1) outlines the study design, rationale, and participant sample; and (2) describes relationships between baseline variables to better understand their influence on the efficacy of the intervention. Results: Participants averaged 19.8 ± 25.0 min of physical activity/week that was at least of moderate intensity, with no group differences. The average estimated VO2 at 85% of maximum heart rate was 25.6 ml/kg/min. Body fat was 34.1% for women and 23.2% for men and the BMI of the sample averaged 28.5 kg/m2. Conclusions: Project STRIDE examines non face-to-face approaches for promoting physical activity behavior. It has unique features including a direct comparison of an expert system guided intervention delivered via phone or print. Future analyses will examine the cost-effectiveness of the interventions and this will likely yield important information for policy-makers.

Original languageEnglish (US)
Pages (from-to)90-104
Number of pages15
JournalContemporary Clinical Trials
Issue number1
StatePublished - Jan 2007

Bibliographical note

Funding Information:
This research was supported in part through a grant from the National Heart, Lung, and Blood Institute (#HL64342). The authors would like to acknowledge the contributions of Linda Christian, R.N., Robin Cram, M.F.A., Lisa Cronkite, B.S., Santina Ficara, B.S., Maureen Hamel, B.S., Jaime Longval, M.S., Kenny McParlin, Hazel Ouellette, Susan Pinheiro, B.A., Regina Traficante, Ph.D., and Kate Williams, B.S. in the conduct of the study. We also would like to thank Manoj Eapen M.D., Vikas Verma M.D. and John Waggoner M.D. for reading the exercise tests performed during this study.


  • Computer assisted
  • Decision-making
  • Exercise
  • Expert systems
  • Intervention studies
  • Telephone


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