BACKGROUND: Women with young children (< 5 years) are an important group for physical activity intervention. PURPOSE: The objective of the study was to evaluate the feasibility, acceptability, and efficacy of MobileMums -- a physical activity intervention for women with young children. METHODS: Women were randomized to MobileMums (n = 133) or a control group (n = 130). MobileMums was delivered primarily via individually tailored text messages. Moderate to vigorous physical activity (MVPA) was measured by self-report and an accelerometer at baseline, end of the intervention (13 weeks), and 6 months later (9 months). Changes were analyzed using repeated-measures models. RESULTS: MobileMums was feasible to deliver and acceptable to women. Self-reported MVPA duration (minutes/week) and frequency (days/week) increased significantly post-intervention (13-week intervention effect 48.5 min/week, 95% credible interval (CI) 13.4 to 82.9 and 1.6 days/week, 95% CI 0.6 to 2.6). Intervention effects were not maintained 6 months later. No effects were observed in accelerometer-derived MVPA. CONCLUSIONS: MobileMums increased women's self-reported MVPA immediately post-intervention. Future investigations need to target sustained physical activity improvements (ACTRN12611000481976).

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