Associations of sedentary behaviors and physical activity with social isolation in 100,839 school students: The Brazilian Scholar Health Survey

Author(s)

Werneck, Andre O. ^[1] ; Collings, Paul J. ^{[2, 3]} ; Barboza, Luciana L. ^[4] ; Stubbs, Brendon ^{[5, 6]} ; Silva, Danilo R. ^{[3, 4]}

Affiliation

^[1] Sao Paulo State Univ UNESP, Dept Phys Educ, Rua Roberto Simonsen 305, BR-19060900 Presidente Prudente, SP - Brazil

^[2] Bradford Teaching Hosp Fdn Trust, Bradford Inst Hlth Res, Bradford, W Yorkshire - England

^[3] Univ York, Dept Hlth Sci, York, N Yorkshire - England

^[4] Fed Univ Sergipe UFS, Dept Phys Educ, Sao Cristovao, Sergipe - Brazil

^[5] Kings Coll London, Inst Psychiat Psychol & Neurosci, Dept Psychol Med, De Crespigny Pk, London SE5 8AF - England

^[6] South London & Maudsley NHS Fdn Trust, London - England

• Document type: Journal article
• Source: GENERAL HOSPITAL PSYCHIATRY; v. 59, p. 7-13, JUL-AUG 2019.
• Web of Science Citations: 1

Abstract

Objective: To examine the relationship between physical activity, sedentary behaviors, and social isolation in a representative sample of Brazilian adolescents. Method: Cross sectional analyses using data from the Brazilian Scholar Health Survey conducted in 2015. The sample included 100,839 adolescents (mean age: 14.3 y, 51.4% Female) from 3040 schools. Information about social isolation (number of close friends and perceived loneliness), physical activity (International Physical Activity Questionnaire) and sedentary behaviors (total sitting time and TV viewing) were self-reported. Chronological age, race and type of city (state capital or other) were co-variables. Logistic regression models were used to analyze the data (results are presented as odds ratios (OR) with 95% confidence intervals). Results: Physical activity was associated with lower odds of both social isolation indicators in boys, and with lower likelihood of having few friends in girls. Greater sitting time was associated with higher likelihood of social isolation, as was low (< 1 h/d) {[}boys: OR: 1.54 (95% CI: 1.33 to 1.77); girls: OR: 1.31 (95% CI: 1.17 to 1.48] and high TV viewing (>= 8 h/d) {[}boys: OR: 1.75 (95% CI: 1.47 to 2.09)]; girls: OR: 1.58 (95% CI: 1.37 to 1.82)]. More than 300 min/week of physical activity was sufficient to eliminate the association of high TV viewing and high sitting time with markers of social isolation in boys. Conclusion: Physical activity is associated with a lower prevalence of social isolation, especially among boys. Both high and low amounts of TV viewing increase the likelihood of social isolation. Physical activity reduced the association between TV viewing and sitting with social isolation among boys. (AU)

• FAPESP's process: 17/27234-2 - Longitudinal association between biological maturation, body fatness and sports participation predicting the risk of metabolic syndrome and C-reactive protein: structural equation modelling (ABCD - growth study)
• Grantee: André de Oliveira Werneck
• Support type: Scholarships in Brazil - Master