title: Using ecological momentary assessment to examine antecedents and correlates of physical activity bouts in adults age 50+ years: a pilot study.
abstract: BACKGROUND
  National recommendations supporting the promotion of multiple short (10+ minute) physical activity bouts each day to increase overall physical activity levels in middle-aged and older adults underscore the need to identify antecedents and correlates of such daily physical activity episodes.
  
  
  OBJECTIVE
  This pilot study used Ecological Momentary Assessment to examine the time-lagged and concurrent effects of empirically supported social, cognitive, affective, and physiological factors on physical activity among adults age 50+ years.
  
  
  METHODS
  Participants (N = 23) responded to diary prompts on a handheld computer four times per day across a 2-week period. Moderate-to-vigorous physical activity (MVPA), self-efficacy, positive and negative affect, control, demand, fatigue, energy, social interactions, and stressful events were assessed during each sequence.
  
  
  RESULTS
  Multivariate results showed that greater self-efficacy and control predicted greater MVPA at each subsequent assessment throughout the day (p < 0.05). Also, having a positive social interaction was concurrently related to higher levels of MVPA (p = 0.052).
  
  
  CONCLUSIONS
  Time-varying multidimensional individual processes predict within daily physical activity levels.
authors.affiliation: Health Promotion Research Branch, Behavioral Research Program, Division of Cancer Control and Population Sciences, National Cancer Institute, Bethesda, MD, USA. dunton@usc.edu
authors.forename: Genevieve Fridlund
authors.initials: GF
authors.lastname: Dunton
authors.forename: Audie A
authors.initials: AA
authors.lastname: Atienza
authors.forename: Cynthia M
authors.initials: CM
authors.lastname: Castro
authors.forename: Abby C
authors.initials: AC
authors.lastname: King
mesh_terms: D000339:Affect; D000367:Age Factors; D000368:Aged; D000375:Aging / Q000523:psychology; D003071:Cognition; D034201:Computers, Handheld; D005260:Female; D006801:Humans; D007398:Interpersonal Relations; D008297:Male; D008875:Middle Aged; D009043:Motor Activity; D010865:Pilot Projects; D011594:Psychometrics; D014481:United States