title: Expectancy-value constructs and expectancy violation as predictors of exercise adherence in previously sedentary women.
abstract: This prospective study examined effects of expectancy of exercise benefits, value of benefits, expectancy violation, and self-efficacy (SE) on exercise behavior and study dropout in sedentary women (n=86). SE predicted exercise for study completers but did not predict study dropout. After 6 and 12 weeks, participants evidenced expectancy violations, particularly for fitness and weight. Initial value, expectancy, and Expectancy X Value did not predict exercise for study completers, but dropouts had higher initial positive expectancies than did completers. Expectancy violations produced in Weeks 1-6 did not predict exercise in Weeks 7-12 in study completers, but dropouts in Weeks 7-12 had higher expectancy violations for weight in Weeks 1-6 than did completers. Follow-up revealed that study dropouts stopped exercising. Identifying individuals with high initial expectancies and expectancy violations may improve health behavior intervention and research.
authors.affiliation: Department of Psychology, University of Kansas, Lawrence 66045, USA. ssears@ku.edu
authors.forename: S R
authors.initials: SR
authors.lastname: Sears
authors.forename: A L
authors.initials: AL
authors.lastname: Stanton
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001835:Body Weight; D015444:Exercise / Q000523:psychology*; D005260:Female; D006801:Humans; D008875:Middle Aged; D009042:Motivation; D010809:Physical Fitness / Q000523:psychology; D020377:Self Efficacy; D012718:Set, Psychology