The effect of a mail-mediated intervention on exercise behavior Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/q237hw63c

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  • Sell-determination theory suggests that social contexts that promote a sense of autonomy, competence, and relatedness will increase internalization of behavioral regulation and lead to more self-determined forms of motivation, the prototype of which is intrinsic motivation. A positive relationship between internalization of exercise behavior regulation and actual levels of exercise has been supported in the exercise domain, however the manipulation of social contexts to elicit greater internalization of exercise behavior regulation has received little attention. The purpose of this study was to examine the effect of a mail-mediated intervention, designed to promote perceptions of autonomy, competence, and relatedness, on exercise behavior in adults. Additionally, this study examined the effect of a booster postcard that emphasized the main points of the initial intervention on the continuance of exercise behavior. Participants were 185 adults initially classified in the preparation stage of exercise behavior. Participants were randomly divided into intervention only (NT), intervention plus booster (INTB), and control (CONT) groups. Both intervention groups received a four-page intervention packet of printed materials, while the control group received an American Heart Association physical activity and health facts packet of similar length. After 1 month, the INTB group received a booster postcard that emphasized the focal points of the initial intervention packet. All participants completed selfreport measures of perceptions of autonomy, perceptions of competence, perceptions of relatedness, exercise behavior regulation, and exercise behavior at baseline, 1 month, and 2 months. One hundred twenty-six participants completed questionnaires at all three time periods. A 3 (INT/INTB/CONT) X 2 (male/female) X 3 (baseline/i month/2 months) repeated measures analysis of variance revealed that all three groups significantly increased exercise behavior over the 2-month period, however no significant interactions were detected. A 3 (INT/NTB/CONT) X 2 (male/female) X 3 (baseline/I month/2 months) repeated measures multivariate analysis of variance conducted for perceptions of autonomy, competence, and relatedness, revealed no significant interactions. Structural equation modeling techniques used to examine the pattern of theoretical relationships among variables did not support the pattern of relationships suggested by self-determination theory, but rather suggested that perceptions of competence mediated the relationship between selfdetermined exercise motivation and exercise behavior.
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