title: Peer volunteers improve long-term maintenance of physical activity with older adults: a randomized controlled trial.
abstract: BACKGROUND
  Using peer volunteers as delivery agents may improve translation of evidence-based physical activity promotion programs for older adults. This study examined whether tailored support from older peer volunteers could improve initiation and long-term maintenance of physical activity behavior.
  
  
  METHODS
  Participants were randomized to 2 16-week, group-based programs: (1) peer-delivered, theory-based support for physical activity behavior change; or (2) an intervention typically available in community settings (basic education, gym membership, and pedometer for self-monitoring), attention-matched with health education. Moderate-to-vigorous physical activity (MVPA) was assessed via daily self-report logs at baseline, at the end of the intervention (16 weeks), and at follow-up (18 months), with accelerometry validation (RT3) in a random subsample.
  
  
  RESULTS
  Seven peer volunteers and 81 sedentary adults were recruited. Retention at the end of the trial was 85% and follow-up at 18 months was 61%. Using intent-to-treat analyses, at 16 weeks, both groups had similar significant improvements in MVPA. At 18 months, the group supplemented with peer support had significantly more MVPA.
  
  
  CONCLUSIONS
  Trained peer volunteers may enhance long-term maintenance of physical activity gains from a community-based intervention. This approach has great potential to be adapted and delivered inexpensively in community settings.
authors.affiliation: Exercise and Wellness Program, Arizona State University, Phoenix, AZ, USA.
authors.forename: Matthew P
authors.initials: MP
authors.lastname: Buman
authors.forename: Peter R
authors.initials: PR
authors.lastname: Giacobbi
authors.forename: Joseph M
authors.initials: JM
authors.lastname: Dzierzewski
authors.forename: Adrienne
authors.initials: A
authors.lastname: Aiken Morgan
authors.forename: Christina S
authors.initials: CS
authors.lastname: McCrae
authors.forename: Beverly L
authors.initials: BL
authors.lastname: Roberts
authors.forename: Michael
authors.initials: M
authors.lastname: Marsiske
mesh_terms: D000054:Acceleration; D000368:Aged; D000375:Aging / Q000502:physiology*; D055317:Evidence-Based Practice; D005260:Female; D015438:Health Behavior; D007722:Health Knowledge, Attitudes, Practice; D006293:Health Promotion / Q000379:methods*; D006801:Humans; D008297:Male; D008611:Mentors; D008875:Middle Aged; D008962:Models, Theoretical; D009043:Motor Activity / Q000502:physiology*; D010379:Peer Group; D010809:Physical Fitness; D012111:Residence Characteristics; D057185:Sedentary Behavior; D020377:Self Efficacy; D040241:Social Marketing; D012944:Social Support; D011795:Surveys and Questionnaires; D013997:Time Factors; D014481:United States; D014838:Volunteers / Q000523:psychology*