title: Older adults' intrinsic and extrinsic motivation toward physical activity.
abstract: OBJECTIVE
  To examine how motives discriminate 3 physical activity levels of inactive, active, and sustained maintainers.
  
  
  METHODS
  Six hundred forty-five adults (M age = 63.8) completed stage-of-change and Exercise Motivations Inventory (EMI-2) scales. Exploratory factor analysis established psychometric properties of the EMI-2 suitable for older adults.
  
  
  RESULTS
  Six factors emerged in the EMI-2: health and fitness, social/emotional benefits, weight management, stress management, enjoyment, and appearance. Enjoyment contributed most to differentiating activity levels. Moderators of age and gender were delineated.
  
  
  CONCLUSIONS
  Intrinsic motivation and self-determined extrinsic motivation distinguish older adults' activity levels.
authors.affiliation: School of Arts and Sciences, Massachusetts College of Pharmacy & Health Sciences, 179 Longwood Avenue, Boston, MA 02115, USA. marie.dacey@mcphs.edu
authors.forename: Marie
authors.initials: M
authors.lastname: Dacey
authors.forename: Amy
authors.initials: A
authors.lastname: Baltzell
authors.forename: Len
authors.initials: L
authors.lastname: Zaichkowsky
mesh_terms: D003710:Demography; D015444:Exercise; D005260:Female; D006304:Health Status; D006801:Humans; D008297:Male; D008875:Middle Aged; D009042:Motivation; D009043:Motor Activity; D011795:Surveys and Questionnaires