Effectiveness of Parent-based Electronic Health (eHealth) Intervention on Preschoolers' Physical Activity, Dietary Behaviors, and Sleep Problems

Background: Preschoolers' lifestyles have become physically inactive and sedentary, their eating habits unhealthy, and their sleep routines increasingly disturbed. Parental involvement appears to be crucial to combat unhealthy lifestyle of preschoolers. Because of recognized barriers of traditional face-to-face interventions (such as time commitment for parents), easy access and lower costs make electronic health (eHealth) interventions appealing. Previous studies that examined the effectiveness of parent-based eHealth on preschooler's (physical activity) PA, dietary behaviors (DB), and sleep have either emphasized on one variable or failed to balance the dosage of PA, diet, and sleep modules or consider the intervention sequence during the intervention period and there is an acknowledged gap in parent-based eHealth interventions which target preschoolers raised in Chinese cultural contexts. Objective: This study aims to investigate the effectiveness of parent-based eHealth intervention on Chinese preschoolers' PA, DB, and sleep problems. Methods: This two-arm parallel randomized controlled trial comprises a 12-week intervention with a 12-week follow-up. 206 parent-child dyads will be randomized to either eHealth intervention group or control group. Participants allocated to the eHealth intervention will receive 12 interactive modules on PA, DB, and sleep, with each module rot on a weekly basis to reduce the sequence effect on variable outcomes. The intervention is grounded upon Social Cognitive Theory and will be delivered through social media, where parents can obtain valid and updated educational information, social rapport, and interact with other group members and facilitators. Participants in the control group will receive weekly brochures on PA, DB, and sleep recommendations from the kindergarten teachers, but they will not receive any interactive components. Data will be collected at baseline, 3 months, and 6 months. The primary outcome will be the prescho