Cost-effectiveness of lifestyle and structured exercise interventions in sedentary adults - Results of project ACTIVE

Background: Project ACTIVE was a randomized clinical trial comparing two ph ysical activity interventions, lifestyle and traditional structured exercis e. The two interventions were evaluated and compared in terms of cost effec tiveness and ability to enhance physical activity among sedentary adults. Design: This was a randomized clinical trial. Setting/Participants: The study included 235 sedentary but healthy communit y-dwelling adults. Intervention: A center-based lifestyle intervention that consisted of behav ioral skills training was compared to a structured exercise intervention th at included supervised, center-based exercise. Main Outcome Measures: The main outcome measures of interest included cost, cardiorespiratory fitness, and physical activity. Results: Both interventions were effective in increasing physical activity and fitness. At 6 months, the costs of the lifestyle and structured interve ntions were, respectively, $46.53 and $190.24 per participant per month. At 24 months these costs were $17.15 and $49.31 per participant per month. At both 6 months and 24 months, the lifestyle intervention was more cost-effe ctive than the structured intervention for most outcomes measures. Conclusions: A behaviorally-based lifestyle intervention approach in which participants are taught behavioral skills to increase their physical activi ty by integrating moderate-intensity physical activity into their daily liv es is more cost-effective than a structured exercise program in improving p hysical activity and cardiorespiratory health. This study represents one of the first attempts to compare the efficiency of intervention alternatives for improving physical activity among healthy, sedentary adults. (C) 2000 American Journal of Preventive Medicine.