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Lookup NU author(s): Professor Mike Catt
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Background: The Internet has potential as a medium for health behavior change programs, but no controlled studies have yet evaluated the impact of a fully automated physical activity intervention over several months with real-time objective feedback from a monitor. Objective: The aim was to evaluate the impact of a physical activity program based on the Internet and mobile phone technology provided to individuals for 9 weeks. Methods: A single-center, randomized, stratified controlled trial was conducted from September to December 2005 in Bedfordshire, United Kingdom, with 77 healthy adults whose mean age was 40.4 years (SD=7.6) and mean body mass index was 26.3 (SD=3.4). Participants were randomized to a test group that had access to an Internet and mobile phone-based physical activity program (n=47) or to a control group (n=30) that received no support. The test group received tailored solutions for perceived barriers, a schedule to plan weekly exercise sessions with mobile phone and email reminders, a message board to share their experiences with others, and feedback on their level of physical activity. Both groups were issued a wrist-worn accelerometer to monitor their level of physical activity; only the test group received real-time feedback via the Internet. The main outcome measures were accelerometer data and self-report of physical activity. Results: At the end of the study period, the test group reported a significantly greater increase over baseline than did the control group for perceived control (P <.001) and intention/expectation to exercise (P <.001). Intent-to-treat analyses of both the accelerometer data (P=.02) and leisure time self-report data (P=.03) found a higher level of moderate physical activity in the test group. The average increase (over the control group) in accelerometer-measured moderate physical activity was 2 h 18 min per week. The test group also lost more percent body fat than the control group (test group: -2.18, SD=0,59; control group: -0.17, SD=0.81; P=.04). Conclusions: A fully automated Internet and mobile phone-based motivation and action support system can significantly increase and maintain the level
Author(s): Hurling R, Catt M, Boni MD, Fairley BW, Hurst T, Murray P, Richardson A, Sodhi JS
Publication type: Article
Publication status: Published
Journal: Journal of Medical Internet Research
Year: 2007
Volume: 9
Issue: 2
Print publication date: 01/01/2007
ISSN (print): 1438-8871
ISSN (electronic): 1439-4456
Publisher: Journal of Medical Internet Research
URL: http://dx.doi.org/10.2196/jmir.9.2.e7
DOI: 10.2196/jmir.9.2.e7
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