To combat maternal morbidity and mortality, interventions designed to increase physical activity levels during and after pregnancy are needed. Mobile phone-based interventions show considerable promise, and BumptUp has been carefully developed to address the lack of exercise among pregnant and postpartum women. The primary goal of this pilot study was to test the potential efficacy of BumptUp for improving physical activity among pregnant and postpartum women. A randomized controlled clinical trial was performed (n = 35) with women either receiving access to the mhealth app or an educational brochure. Physical activity and self-efficacy for exercise data were collected at baseline (in mid-pregnancy) and at three additional timepoints (late pregnancy, 6 and 12 weeks postpartum). For moderate-to-vigorous physical activity, a clear trend is observed as the mean estimated difference between groups increases from -0.35 (SE 1.75) in mid-pregnancy to -0.81 (SE 1.75) in late pregnancy. For self-efficacy for exercise, the estimated difference of means (control-intervention) changed from 0.96 (SE 6.53) at baseline to -7.64 (SE 6.66) in late pregnancy and remained at -6.41 (SE 6.79) and -6.70 (SE 6.96) at 6 and 12 weeks postpartum, respectively. When assessing the change in self-efficacy from mid-to -ate pregnancy only, there was a statistically significant difference between groups (p = 0.044). BumptUp R (version 1.0 (3)) shows potential for efficacy. Pilot data suggest key refinements to be made and a larger clinical trial is warranted.

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