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Postpartum Physical Activity: Measuring Theory of Planned Behavior Constructs

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Objectives : 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.

Keywords: exercise; invariance; physical activity; postpartum; theory of planned behavior; validity

Document Type: Research Article


Affiliations: 1 Postdoctoral Research Associate, Center for Health Promotion and Disease Prevention, University of North Carolina, Chapel Hill, NC.

Publication date: July 1, 2010

More about this publication?
  • The American Journal of Health Behavior seeks to improve the quality of life through multidisciplinary health efforts in fostering a better understanding of the multidimensional nature of both individuals and social systems as they relate to health behaviors.

    The Journal aims to provide a comprehensive understanding of the impact of personal attributes, personality characteristics, behavior patterns, social structure, and processes on health maintenance, health restoration, and health improvement; to disseminate knowledge of holistic, multidisciplinary approaches to designing and implementing effective health programs; and to showcase health behavior analysis skills that have been proven to affect health improvement and recovery.

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