JMIR Publications

ABSTRACT

Background:

Many mobile health (mHealth) apps focus on promoting physical activity (PA) and healthy eating (HE). However, there is limited empirical evidence regarding their effectiveness in initiating and sustaining behavior change, particularly among children and adolescents. Considering that behavior is influenced by social contexts, it is essential to take core settings like family dynamics into account when designing mHealth apps.

Objective:

The purpose of this study was to further develop and refine the SMARTFAMILY app targeting PA and HE in a collective family-based setting by enhancing design and usability, as well as by adding gamification aspects, health literacy, and just-in-time adaptive interventions (JITAI) to the first version of the app.

Methods:

The SMARTFAMILY2.0 app, based on behavior change theories and techniques, was developed, implemented, and evaluated. The app was used in a collective family setting, with family members using it individually and cooperatively. In a cluster-randomized controlled trial, the intervention group (IG) used the app for three consecutive weeks, while the control group (CG) received no treatment. Primary outcomes included physical activity (PA) measured through self-reports and accelerometry, as well as self-reported fruit and vegetable intake (FVI) for health eating (HE). Secondary outcomes included intrinsic motivation, behavior-specific self-efficacy, and the Family Health Climate (FHC). A follow-up assessment (T2) was conducted four weeks after the post-measurement (T1) to assess intervention effects. Multilevel analyses were performed in R, considering the hierarchical structure of individuals (level 1) within families (level 2).

Results:

Overall, 55 families (28 CG, n = 105; 27 IG, n = 104 participants) were recruited for the study. Three families (3 KG, n = 12) chose to drop out of the study due to personal reasons before T0. Overall, no evidence for meaningful and statistically significant increases in PA was observed in favour of the IG our physically active sample. However, the app elucidated positive effects in favor of the intervention group for FVI diary (T0-T1; p = .031), joint PA (T0-T1 and T0-T2; p <.026), and joint family meals (T0-T1; p =.004).

Conclusions:

The SMARTFAMILY2.0 trial evaluated a mHealth intervention designed to promote PA and HE within families. Despite incorporating a theoretical foundation, several behavior change techniques based on family life and gamification and JITAI features, the intervention did not significantly increase PA levels among physically active participants. FVI intake, joint PA, and joint meals were improved within the intervention group. Previous studies on digital health interventions have produced mixed results, and family-based mHealth interventions remain rare, with limited focus on whole-family behavior and randomized controlled trials. To enhance intervention effectiveness, future app development could consider incorporating even more advanced features and should focus on inactive participants. Further research is needed to better understand intervention engagement and tailor mHealth approaches for primary prevention efforts. Clinical Trial: The study is registered with the German Clinical Trials Register under the registration number DRKS00010415.