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. METHOD: Participants who reported having recently increased their MVPA to a minimum of 2d/wk, 30 min/bout (N = 1,049) 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 < 0.03, Cohen's d (6 m) = 0.16), 12 (p < 0.04, d (12 m) = 0.13) and 24 months (p < 0.01, d (24 m) = 0.16) 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.
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