Postpartum physical activity: measuring theory of planned behavior constructs.
OBJECTIVE
To produce evidence for factor validity and longitudinal invariance of scales used to examine the theory of planned behavior applied to physical activity.


METHODS
Self-report questionnaires were administered at 3- (n = 267) and 12-months (n = 333) postpartum.


RESULTS
A single-factor model fit data from the normative beliefs, perceived behavioral control, and behavioral beliefs scales. Attitude and control beliefs were found to be multidimensional. Longitudinal invariance of all scales was supported.


CONCLUSIONS
Each scale had strong validity evidence. Future research using these measures will help identify areas for intervention and reveal how changes in these constructs influence physical activity.
Hales
Derek
D
Center for Health Promotion and Disease Prevention, University of North Carolina, Chapel Hill, NC 27599, USA. derekh@email.unc.edu
Evenson
Kelly R
KR
Wen
Fang
F
Wilcox
Sara
S
D000293:Adolescent; D000328:Adult; D001294:Attitude to Health; D003469:Culture; D015444:Exercise / Q000523:psychology*; D005163:Factor Analysis, Statistical; D005260:Female; D015438:Health Behavior; D006801:Humans; D033182:Intention; D008962:Models, Theoretical; D009657:North Carolina; D049590:Postpartum Period / Q000523:psychology*; D011582:Psychological Theory; D015203:Reproducibility of Results; D020377:Self Efficacy; D011795:Surveys and Questionnaires; D055815:Young Adult