title: Social-cognitive theory predictors of exercise behavior in endometrial cancer survivors.
abstract: OBJECTIVE
  This study evaluated whether social-cognitive theory (SCT) variables, as measured by questionnaire and ecological momentary assessment (EMA), predicted exercise in endometrial cancer survivors.
  
  
  METHODS
  One hundred posttreatment endometrial cancer survivors received a 6-month home-based exercise intervention. EMAs were conducted by using hand-held computers for 10- to 12-day periods every 2 months. Participants rated morning self-efficacy and positive and negative outcome expectations by using the computer, recorded exercise information in real time and at night, and wore accelerometers. At the midpoint of each assessment period, participants completed SCT questionnaires. Using linear mixed-effects models, the authors tested whether morning SCT variables predicted minutes of exercise that day (Question 1) and whether exercise minutes at time point Tj could be predicted by questionnaire measures of SCT variables from time point Tj-1 (Question 2).
  
  
  RESULTS
  Morning self-efficacy significantly predicted that day's exercise minutes (p < .0001). Morning positive outcome expectations were also associated with exercise minutes (p = .0003), but the relationship was attenuated when self-efficacy was included in the model (p = .4032). Morning negative outcome expectations were not associated with exercise minutes. Of the questionnaire measures of SCT variables, only exercise self-efficacy predicted exercise at the next time point (p = .003).
  
  
  CONCLUSIONS
  The consistency of the relationship between self-efficacy and exercise minutes over short (same day) and longer (Tj to Tj-1) time periods provides support for a causal relationship. The strength of the relationship between morning self-efficacy and exercise minutes suggest that real-time interventions that target daily variation in self-efficacy may benefit endometrial cancer survivors' exercise adherence.
authors: Department of Behavioral Science.
authors: Karen
authors: K
authors: Basen-Engquist
authors: Cindy L
authors: CL
authors: Carmack
authors: Yisheng
authors: Y
authors: Li
authors: Jubilee
authors: J
authors: Brown
authors: Anuja
authors: A
authors: Jhingran
authors: Daniel C
authors: DC
authors: Hughes
authors: Heidi Y
authors: HY
authors: Perkins
authors: Stacie
authors: S
authors: Scruggs
authors: Carol
authors: C
authors: Harrison
authors: George
authors: G
authors: Baum
authors: Diane C
authors: DC
authors: Bodurka
authors: Andrew
authors: A
authors: Waters
mesh_terms: D000328:Adult; D000368:Aged; D016889:Endometrial Neoplasms / Q000628:therapy*; D005081:Exercise Therapy; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008875:Middle Aged; D010349:Patient Compliance / Q000706:statistics & numerical data*; D011582:Psychological Theory; D020377:Self Efficacy; D011795:Surveys and Questionnaires; D017741:Survivors / Q000523:psychology* / Q000706:statistics & numerical data; D013997:Time Factors