OBJECTIVE: To examine the relationship of level of physical activity and length of time of adherence to physical activity, with physical activity identity (PAI) and physical activity self-efficacy (PASE). METHODS: In a cross-sectional design, 409 adults completed a survey assessing activity level and adherence, PAI and PASE. RESULTS: Vigorous activity was associated with higher scores on PAI and PASE scales with activity level contributing significantly larger proportions of the variance in scores compared to adherence. CONCLUSION: Effort should be invested in encouraging people when beginning an exercise regimen to set a long-term goal of vigorous activity. This approach may lead to stronger identification with and self-efficacy for physical activity leading to greater adherence.
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Miller et al. (2002) studied this question.