Relationship between smartphone use and sedentary behavior: a school-based study with adolescents / Relacionamento entre smartphone e comportamento sedentário: estudo de base escolar com adolescentes
The aims of this study were a) to describe the smartphone use and sedentary behavior (SB) on typical weekdays and weekends, and b) to verify the association between smartphone use and SB among adolescents. This is a cross-sectional population school-based, which surveyed 984 students from Uberaba, Minas Gerais, in 2015. Gender-stratified analysis were performed using t-tests, Pearson's correlation (r) and multiple linear regression (ß). Girls used more smartphones than boys (weekdays: 6.58 hrs vs. 5.29 hrs, p < 0.001; weekend: 7.81 hrs vs. 6.18 hrs, p < 0.001). Both genders used more smartphones in the weekend (p < 0.001) than weekdays. SB was higher in girls than boys (weekdays: 5.34 hrs vs. 4.48 hrs, p < 0.001, weekend: 5.22 hrs vs. 4.38 hrs, p < 0.001). SB was higher for both genders at weekend (p < 0.001) than on weekdays. Correlation between SB and smartphone use ranged from weak to moderate in both genders (weekdays: boys, r = 0.30; girls, r = 0.17, p < 0.001; weekend: boys, r = 0.39; girls, r = 0.17, p < 0.001). Smartphone use was positively associated with SB during the weekdays (boys: ß = 0.25, girls: ß = 0.19, p < 0.001) and weekend (boys: ß = 0.31; girls: ß= 0.14, p < 0.001). Girls showed greater SB and smartphone use than boys, regardless if compared on weekdays or weekend. SB and smartphone were positively associated in both genders
Os objetivos deste estudo foram a) descrever o uso de smartphone e o comportamento sedentário (CS) em dias típicos de semana e final de semana (FDS) e, b) verificar a associação entre o uso de smartphone e o CS em adolescentes. Trata-se de um estudo transversal, com 984 escolares de Uberaba, Minas Gerais, conduzido em 2015. Para análises estratificadas por sexo, utilizou-se testes-t, correlação de Pearson (r) e regressão linear múltipla (ß). Moças usavam mais o smartphone que os rapazes (semana: 6,58 vs. 5,29 horas, p < 0,001; FDS: 7,81 vs. 6,18 horas, p < 0,001). Ambos os sexos usaram mais smartphone no FDS (p < 0,001). O CS foi maior nas moças que nos rapazes (semana: 5,34 vs. 4,48 horas, p < 0,001; FDS: 5,22 vs. 4,38 horas, p < 0,001). O CS foi maior no FDS, em ambos os sexos (p < 0,001). A correlação entre CS e smartphone foi de fraca a moderada em ambos os sexos (semana: rapazes, r = 0,30; moças, r = 0,17, p < 0,001; e FDS: rapazes, r = 0,39; moças, r = 0,17, p < 0,001). Uso de smartphone foi positivamente associado com CS durante a semana (rapazes: ß = 0,25; moças: ß = 0,19, p < 0,001) e FDS (rapazes: ß = 0,31; moças: ß = 0,14, p < 0,001). Moças apresentaram maior CS e uso de smartphone do que rapazes, independentemente se comparados na semana ou FDS. CS e uso de smartphones foram positivamente associados em ambos os sexos