• Yoshimi Fukuoka, Eric Vittinghoff, So Son Jong, and William Haskell.
• Department of Physiological Nursing, University of California San Francisco, 2 Koret Way BOX0610 San Francisco, CA 94143, USA. Yoshimi.fukuoka@ucsf.edu
• Prev Med. 2010 Sep 1; 51 (3-4): 287-9.

ObjectivesThis uncontrolled pilot study assessed changes in pedometer-measured step counts and self-reported physical activity during a 3-week mobile phone-based intervention. We also explored whether age, BMI, and psychosocial factors were associated with changes in step counts.MethodsForty-one sedentary adult women in San Francisco, California were asked to report their pedometer steps using a study-supplied mobile phone from June to September 2008. In the second and third weeks, daily prompts delivered by the mobile phone encouraged participants to increase steps by 20% from the previous week.ResultsMean age was 48 years. Average daily total steps increased by approximately 800 or 15% over three weeks (p<0.001). Lower BMI, no antidepressant use, and lower self-reported health status were associated with higher step counts at baseline. Improvements in self-reported will-power were associated with increases in step counts (p<0.001). Neither age (p=0.55) nor BMI (p=0.13) was significantly associated with changes in activity over the 3 weeks.ConclusionsThe intervention appeared to motivate sedentary women to increase their physical activity. A randomized controlled clinical trial is warranted and feasible.Copyright © 2010 Elsevier Inc. All rights reserved.

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