Abstract

The present study examines the applicability of the TTM to understanding exercise behavior among a random sample of adolescents, adults, and older adults. Specifically, the study investigated the theorized association of the TTM constructs (i.e., self-efficacy, decisional balance, behavioral and cognitive processes of change) by stage of exercise behavior. A total of 598 people (adolescent: 200, adult: 199, and older adult: 199) were recruited from the N and S districts in northern Seoul. In order to measure the study participants` psychological attributes, 4 Korean version of TTM questionnaires were used in the study: Stage of Exercise Behavior Questionnaire, Processes of Change questionnaire, Decisional Balance Scale for Exercise, and Exercise Self-efficacy Scale. Results indicated that the exercise behavior distribution differentiated at the three age groups. In specific, the number of adolescents who do not exercise was significantly higher than other age groups. MANOVA revealed that most of the TTM constructs except cons were significantly associated with the stage of change for exercise behavior. In addition, Hierarchical regression analysis shows that self-efficacy and behavioral processes of change were a significant variable to predicting stage of exercise behavior in a combining group (R2=0.40). This study offer further cross-sectional support for internal validity of TTM, as self-efficacy and the behavioral processes of change were important variables for exercise behavior. In addition, overall the results obtained from this study are in general agreement with the previous findings reported by western countries and therefore, the external validation of TTM is supported.

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