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The purpose of the present study was to compare the utility of the theories of reasoned action and planned behavior in predicting the exercise intentions and behavior of corporate employees. Corporate employees (/7=332) who completed two questionnaires served as subjects. The first questionnaire assessed intentions, subjective norm, attitude, and perceived control with respect to participating in regular, vigorous physical activity. Participants also completed a follow-up questionnaire 4 weeks later that assessed self-reported frequency of vigorous physical activity during those 4 weeks. Hierarchical-regression analyses indicated that perceived behavioral control (the critical variable in the theory of planned behavior) accounted for a significant portion of the variance in intentions and self-reported exercise behavior, above that accounted for by reasoned action. These results lend support to Ajzen's theory of planned behavior, which suggests that individuals' perceptions of control are most important when attempting behaviors that are not completely under volitional control.
J. Kimiecik is with the PHS Department at Miami University, Phillips Hall, Oxford, OH 45056.