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Population-based randomized controlled trial of a stage-targeted physical activity intervention
Alison L Marshall1, Adrian E Bauman, Neville Owen
1The University of Queensland, School of Movement Studies, St Lucia, Australia. alisonm@hms.uq.edu.au
Summary
A mailed, stage-targeted print intervention effectively increased physical activity in adults. The intervention was most successful for participants who engaged with the materials, showing potential for population-based health promotion.
Area of Science:
- Public Health
- Behavioral Science
- Health Promotion
Background:
- Previous trials show mailed, stage-targeted print materials can boost physical activity short-term.
- This study investigated a similar intervention in a random sample of regional city adults.
Purpose of the Study:
- To evaluate the effectiveness of a mailed, stage-targeted print intervention on physical activity levels.
- To assess the intervention's impact on adults aged 40-60 in a regional city.
Main Methods:
- 462 adults (40-60 years) were randomized to intervention (n=227) or control (n=235).
- Intervention group received a single mailing of stage-targeted booklets.
- Physical activity and motivational readiness were assessed at 2 and 6 months.
Main Results:
- At 2 months, intervention participants were more likely to meet physical activity recommendations (OR=2.40).
- At 6 months, those who read the materials were more likely to meet recommendations (OR=2.03).
Conclusions:
- The stage-targeted print intervention effectively increased short-term physical activity.
- Engagement with materials was key to effectiveness.
- The intervention is a low-cost, potentially generalizable strategy for physical activity promotion, though sustained change may require additional methods.