This study explored the utility of reasoned action, planned behavior, and social cognitive models in explaining aerobic exercise intentions and behavior. Two hundred eighty-four college students completed measures of each model's central predictor variables, as well as indices of prior exercise frequency and future exercise intentions and behavior. Findings indicate that the reasoned action and social cognitive models are each significantly predictive of future exercise intention and behavior. The planned behavior model did not improve over the theory of reasoned action in predictive analyses. The effects of prior exercise activity on future exercise behavior are also partially mediated by variables from the reasoned action and social cognitive models. Implications for further research on theories of exercise behavior are discussed.
Galen A. Yordy is now at the Northeastern Center, P.O. Box 817, Kendallville, IN 46755. Robert W. Lent is with the Department of Counseling, Educational Psychology, and Special Education at Michigan State University, 437 Erickson Hall, East Lansing, MI 48824.