• Fábio de Freitas, Cleliani de Cassia da Silva, Roberto Mendes, Maria Ângela Antonio, and Mariana Zambon.
• Universidade Estadual de Campinas, Faculdade de Ciências Médicas, Pós-Graduação em Saúde da Criança e do Adolescente - Campinas (SP), Brazil.
• Rev Assoc Med Bras (1992). 2021 Mar 1; 67 (3): 373-377.

ObjectiveTo analyze the use of a mobile physical activity application and its influence on body composition and sleep quality in overweight children.MethodsProspective study with 37 patients from the Child and Adolescent Obesity Clinic at Unicamp Hospital das Clínicas, between 2018 and 2019. Anamnesis and anthropometry were performed. We oriented the use of the application for six weeks, five days/week for ten minutes.ResultsAmong 37 patients, 28 (mean age 10.7±2.0 years, 50% boys) used the application. The average use of the application ranged from 1.93±2.18 to 3.25±1.84 times/week, with a peak in the second week and a progressive decrease during follow-up. The paired t-test showed, on average, lean mass (t (27)=-2.91), weight (t (27)=-3.11) and height (t (27)=-3.79). After using the application, these were higher than before (all p<0.05). There was a significant difference in the proportion of children who presented difficulty sleeping (χ2 (1)=5.143) and insomnia (χ2 (1)=4.167).ConclusionsThere was an improvement in sleep quality and an increase in lean mass, but no significant changes in BMI z-score, waist circumference, and body fat percentage.

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