Developing a Mobile App to Promote Physical Activity in Adolescents

Thesis Abstract

Despite numerous initiatives aimed at increasing physical activity among adolescents, rates of inactivity remain alarmingly high, contributing to rising incidences of obesity, cardiovascular diseases, and psychological issues within this demographic. The proliferation of mobile technology presents an opportunity to address these challenges by leveraging adolescent engagement with smartphones through targeted applications that promote and facilitate physical activity. This research aims to develop, implement, and evaluate a mobile application designed to motivate adolescents to incorporate regular physical activity into their routines, thereby improving their overall health outcomes. The specific objectives are to (1) identify behavioral determinants influencing adolescents' physical activity levels, (2) design an engaging, user-centered mobile app grounded in behavior change theories, particularly the Social Cognitive Theory and the Self-Determination Theory, and (3) assess the effectiveness of the app in enhancing physical activity levels among adolescents. The study adopts a mixed-methods research design, combining qualitative exploratory methods with quantitative evaluation. The target population consists of adolescents aged 13 to 18 years enrolled in secondary schools within a metropolitan city. A sample size of 300 participants will be selected through stratified random sampling to ensure representative diversity across age, gender, and socioeconomic status. Data collection instruments include structured questionnaires validated for physical activity measurement, focus group discussions to explore motivational factors, and app usage logs to monitor engagement levels. Quantitative data will be analyzed using descriptive statistics, paired t-tests, and multiple regression analysis to determine changes in physical activity levels pre- and post-intervention. Thematic analysis will be employed on qualitative data to uncover behavioral motivators and barriers, providing contextual insights complementing quantitative findings. Key expected findings include a statistically significant increase in weekly moderate-to-vigorous physical activity among adolescents utilizing the mobile app compared to baseline measures. The analysis is projected to reveal that app engagement correlates positively with behavior change, supported by increased self-efficacy and autonomous motivation as outlined by the Social Cognitive and Self-Determination Theories. The research anticipates identifying specific app features—such as goal-setting modules, social support networks, and gamified rewards—that effectively facilitate sustained physical activity. The integration of behavioral theories into the app’s design is expected to demonstrate a statistically meaningful impact on adolescents' motivation and activity levels, providing empirical evidence of digital interventions’ efficacy. This investigation contributes novel insights into the application of ICT-based solutions for adolescent health promotion within the domain of physical activity. It offers a comprehensive framework for developing mobile health applications grounded in behavioral science, emphasizing user-centered design and evidence-based motivational strategies. The findings will advance knowledge on technology-driven behavior modification, particularly within the context of adolescent health behavior change. The study’s contribution extends to informing policymakers, health practitioners, and app developers on effective features and engagement strategies to foster active lifestyles among youth populations. In conclusion, the study affirms the potential of well-designed mobile applications to serve as scalable, accessible interventions for promoting physical activity among adolescents. It recommends the integration of behavioral theory principles into digital health tools and advocates for collaborative efforts among educators, health professionals, and technology developers to enhance adolescent engagement. Future research should explore longitudinal effects, app customization for diverse populations, and integration with broader health promotion programs. This study underscores the importance of leveraging ICT innovations to address persistent public health challenges associated with adolescent inactivity, thereby contributing significantly to the field of health informatics and physical education.