Stages of change in adolescents: an examination of self-efficacy, decisional balance, and reasons for relapse.
OBJECTIVE
The purpose of this study was to test selected constructs of the transtheoretical model (TTM) of behavior change in relation to exercise behavior with an adolescent sample. A further purpose was to examine reasons why adolescents stop physical activity and to relate these to stages of exercise change.


METHODS
Participants were 15 to 17 year old students at a private high school (N = 327). Participants completed a questionnaire consisting of an exercise measure, measures of the TTM variables, and an open-ended question that asked if they used to exercise in the past but currently did not, why they had stopped. The TTM data were analyzed using ANOVA F-tests with post-hoc Scheffe tests. To evaluate the ability of the TTM variables to discriminate between stages of exercise behavior, standard discriminant function analyses were performed. Open-ended answers to the relapse question were themed according to a model which categorizes barriers preventing youth's participation in recreational activities as infrastructural, superstructural, and procedural. The relationship of perceived barriers to stage of behavior change was assessed using cross-tabulation and chi-square analyses.


RESULTS
Moderate support for the TTM constructs were found, with the strongest discriminator between stages being strenuous exercise, and self-efficacy being the most supported construct. Infrastructural, superstructural, and procedural barriers were all evident.


CONCLUSIONS
Over 30% of previously active adolescents in this study reported barriers precluding extracurricular physical activity. Interventions should target the most often cited reasons for relapse: time and limits relating to the nature of the adolescent self.
Berry
Tanya
T
Department of Kinesiology and Physical Education, Wilfrid Laurier University, Canada. tberry@wlu.ca
Naylor
P J
PJ
Wharf-Higgins
Joan
J
D000293:Adolescent; D000294:Adolescent Behavior / Q000523:psychology*; D003657:Decision Making; D015444:Exercise; D005260:Female; D015438:Health Behavior; D006306:Health Surveys; D006801:Humans; D008297:Male; D008960:Models, Psychological; D009042:Motivation; D020377:Self Efficacy