JMIR Publications

ABSTRACT

Background:

Pregnant patients with overweight or obesity are at high risk of perinatal complications. Excess gestational weight gain further exacerbates this risk. Mobile health (mHealth) lifestyle interventions that leverage technology to facilitate self-monitoring and provide just-in-time feedback may motivate behavior change to reduce excess gestational weight gain, reduce intervention costs, and increase scalability by improving access.

Objective:

To test the acceptability and feasibility of a pilot mHealth lifestyle intervention for pregnant patients with overweight or obesity to promote moderate-intensity physical activity, encourage guideline-concordant gestational weight gain, and inform the design of a larger pragmatic cluster randomized controlled trial.

Methods:

We conducted a mixed-methods acceptability and feasibility randomized controlled trial among pregnant patients with a pre-pregnancy body mass index 25.0-40.0 kg/m2. Patients with singletons at 8–15 weeks’ gestation, and aged 21 years or older with Wi-Fi access were randomly assigned (1:1) to receive usual prenatal care or an mHealth lifestyle intervention. Participants in the intervention arm received wireless scales, access to an intervention website, activity trackers to receive automated feedback on weight gain and activity goals, and a monthly call from a lifestyle coach. Surveys and focus groups with intervention participants assessed intervention satisfaction and ways to improve the intervention. Physical activity outcomes were assessed using the Pregnancy Physical Activity Questionnaire and gestational weight gain was assessed using electronic health record data in both arms.

Results:

Thirty-three patients were randomly assigned to the intervention arm and 35 patients to the usual care arm. 100% of participants in the intervention arm weighed themselves at least once a week compared with 20% of participants in the usual care arm. Participants in the intervention arm wore the activity tracker 6.4 days/week, weighed themselves 5.3 times/week, and 87.9% rated the program “good to excellent.” Focus groups found participants desired more support related to nutrition to help them manage gestational weight gain and would have preferred an app instead of a website. Participants in the intervention arm had a 23.46 MET-hours greater change in total physical activity per week (95% CI:1.13, 45.8) and a 247.2-minute greater change in moderate intensity physical activity per week (95% CI: 36.2, 530.6) in unadjusted models, but these effects were attenuated in adjusted models (change in total physical activity: 15.55 MET-hours per week; 95% CI: -6.32, 37.42; change in moderate intensity physical activity: 199.6 minutes per week; 95% CI: -43.7, 442.9). We found no difference in total gestational weight gain (mean difference: 1.14 kg; 95% CI: -0.71, 3.00) compared to usual care.

Conclusions:

A pilot mHealth lifestyle intervention was feasible, highly acceptable, and promoted self-monitoring. Refined interventions are needed to effectively impact physical activity and gestational weight gain among pregnant patients with overweight or obesity. Clinical Trial: ClinicalTrials.gov NCT03936283