We aimed to pilot the evaluation of the PEGASO system, a smartphone-based intervention (apps/wearables/game) to improve lifestyles and increase awareness.

We conducted a before-after quasi-experimental pilot controlled study. Teenagers aged 13–16 in a 2:1 (intervention: comparative group [IG:CG]) basis from Spain, Italy and the United Kingdom were recruited. The IG had access to the apps and game for six months, and to smart sensors for the last two months. Schools were recruited by convenience sampling. Participants in both groups undertook (i) anthropometric measurements, (ii) diet (KIDMED), physical activity (PAQ-A) and sleep (HELENA study) validated questionnaires, and (iii) ad-hoc lifestyles knowledge questionnaire. PEGASO, if used, continuously recorded diet and physical activity. User experience was assessed through focus groups.

Five hundred and fifty-eight participants were included (IG:365 / CG:193). The mean (standard deviation; SD) age was 14.8 (0.8), and 52.3 percent were girls. At baseline, mean scores (SD) of KIDMED, PAQ-A and weekday and weekend sleep hours were 5.60 (2.41), 2.48 (0.66), 8.34 (1.07) and 9.99 (1.66), respectively. The percentage of correct answers of lifestyle's knowledge was 65.2 percent (range 13–100 percent). The IG and CG did not show differences for main outcome variables. At six months, a higher percentage of participants in the IG reported an increase of at least one point in the adherence to Mediterranean Diet (43.8 percent vs. 35.4). No differences were observed for other lifestyles. Focus group results showed a predisposition of adolescents to use mHealth for health promotion; the platform was considered to be useful and complete and personalized suggestions were positively valued. Participants reported few limited interest ion the game and several technical issues.

Although participants were motivated and excited about their involvement in the study, and that PEGASO was something desirable for them, the system only showed some impact in specific areas – namely, diet – and could improve some its technological features. Several challenges and opportunities are associated with the implementation of mHealth.