title: Maintaining physical activity among older adults: 24-month outcomes of the Keep Active Minnesota randomized controlled trial.
abstract: OBJECTIVE
  To evaluate the efficacy at 6-, 12-, and 24-month follow-up of Keep Active Minnesota (KAM), a telephone and mail-based intervention designed to promote physical activity (PA) maintenance among currently active adults age 50 to 70.
  
  
  METHODS
  Participants who reported having recently increased their MVPA to a minimum of 2d/wk, 30 min/bout, (N=1049) were recruited in 2004 and 2005 from one large managed care organization in Minnesota, and randomly assigned to either treatment (KAM; N=523), or Usual Care (UC; N=526) with PA assessed using the CHAMPS questionnaire, and expressed as kcal/wk energy expenditure.
  
  
  RESULTS
  We find a sustained, significant benefit of the intervention at 6, 12 and 24 months. kcal/wk expenditure in moderate or vigorous activities was higher at 6 (p<.03, Cohen's d(6m)=.16), 12 (p<.04, d(12 m)=.13) and 24 months (p<.01, d(24 m)=.16) for KAM participants, compared to UC participants.
  
  
  CONCLUSIONS
  The KAM telephone- and mail-based PA maintenance intervention was effective at maintaining PA in both the short-term (6 months) and longer-term (12 and 24 months) relative to usual care.
authors.affiliation: HealthPartners Research Foundation, Minneapolis, MN 55440-1524, USA. Brian.C.Martinson@HealthPartners.Com
authors.forename: Brian C
authors.initials: BC
authors.lastname: Martinson
authors.forename: Nancy E
authors.initials: NE
authors.lastname: Sherwood
authors.forename: A Lauren
authors.initials: AL
authors.lastname: Crain
authors.forename: Marcia G
authors.initials: MG
authors.lastname: Hayes
authors.forename: Abby C
authors.initials: AC
authors.lastname: King
authors.forename: Nico P
authors.initials: NP
authors.lastname: Pronk
authors.forename: Patrick J
authors.initials: PJ
authors.lastname: O'Connor
mesh_terms: D000368:Aged; D005081:Exercise Therapy; D005260:Female; D006279:Health Maintenance Organizations; D006293:Health Promotion / Q000379:methods*; D006801:Humans; D008297:Male; D018670:Monitoring, Ambulatory; D017063:Outcome Assessment, Health Care; D010349:Patient Compliance; D017060:Patient Satisfaction; D040242:Risk Reduction Behavior; D013689:Telephone
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