A pilot trial of three very brief interventions for physical activity in primary care

Abstract

Background: Very brief interventions (<5 minutes) for physical activity have substantial public health potential but there is uncertainty about their potential effectiveness and cost. Our pilot trial assessed these for three promising interventions as part of preventative health checks. Methods: 394 adults (mean (SD)=53 (9.1) years, 59% female) were randomized to a Motivational (n=83), Pedometer (n=74), or Combined (n=80) intervention following the health check, or Control (n=157). At 4-week follow-up we assessed physical activity by accelerometers and self-report, beliefs about increasing activity, and cost. Findings: We found no significant differences in objective or self-reported activity across groups. Probability of a positive effect on physical activity was higher for the Motivational and Pedometer interventions. Participants in all intervention groups reported stronger intentions to increase activity compared to Control. Average cost of the interventions varied between £6.83 and £20.98 per patient. Discussion: Very brief interventions for physical activity in primary care are inexpensive and can potentially increase physical activity. A fully-powered trial is assessing cost-effectiveness and estimated public health impact of the Pedometer intervention.