Abstract
An underlying assumption of physical activity interventions is that greater adherence to the intervention will result in greater physical activity participation. However, this assumption is rarely tested. PURPOSE This study examined whether adherence to a lifestyle physical activity intervention predicted weekly participation in at least 150 minutes of moderate to vigorous physical activity among 244 sedentary healthy adults. METHODS Structural equation modeling was used to assess the association between adherence and physical activity. Markers of adherence were attendance, homework completion, and self-monitoring for a group-based intervention and telephone call completion, homework completion, and self-monitoring for a telephone and mail-delivered intervention. RESULTS For both interventions, adherence significantly predicted moderate to vigorous physical activity (p < .05). CONCLUSION Adherence to lifestyle physical activity interventions ought to be encouraged to increase the likelihood that participants will engage in an adequate amount of physical activity for health benefits to occur. This research was supported by a grant funded through the National Heart, Lung, and Blood Institute (HL 58608). The analysis was completed part of a predoctoral fellowship sponsored by the National Cancer Institute Grant R25 CA57712.
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