OLINDA DO CARMO LUIZ
Projetos de Pesquisa
Unidades Organizacionais
LIM/38 - Laboratório de Epidemiologia e Imunobiologia, Hospital das Clínicas, Faculdade de Medicina
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- Sociodemographic and behavioral factors associated with physical activity in Brazilian adolescents(2014) REZENDE, Leandro Fornias Machado de; AZEREDO, Catarina Machado; CANELLA, Daniela Silva; CLARO, Rafael Moreira; CASTRO, Ines Rugani Ribeiro de; LEVY, Renata Bertazzi; LUIZ, Olinda do CarmoBackground: Physical activity in adolescents is associated with short-and long-term health benefits. Physical activity can occur in various domains and is influenced by a complex network of factors. The aims of this study are 1) to describe the physical activity of Brazilian adolescents in physical education classes, during leisure time, and during active commuting and 2) to investigate the socio-demographic and behavioral factors associated with physical activity. Methods: The representative sample included 109,104 Brazilian students in the final year of elementary school from 2,842 schools. The weekly frequency and duration of physical activity were assessed. A variety of socio-demographic and behavioral factors were studied. A multiple Poisson regression analysis was used to test for associations between physical activity and the socio-demographic and behavioral variables. Results: Most of the students (97.0%) engaged in physical activity in at least one of the domains studied, especially physical education at school (81.7%) and leisure time physical activity (67.5%). However, only 29% of the adolescents reached the recommended level of physical activity. Among the adolescents who reached the minimum recommended time for physical activity, the various domains contributed the following proportions to total physical activity: leisure time physical activity (PR 12.5; 95% CI 11.17-13.97), active commuting (PR 1.63; 95% CI 1.59-1.67), and physical education at school (PR 1.36; 95% CI 1.29-1.44). The weekly frequency of all activities was greater among boys than among girls. Moreover, nearly two-thirds (61.8%) of students spent more than two hours per day engaging in sedentary behaviors; the prevalence of sedentary behaviors was similar between boys and girls (59.0 and 64.5%, respectively). Total level of physical activity, leisure time physical activity, and active commuting were associated with higher nutritional scores. Conclusions: Physical activity is important in any health promotion program. Therefore, it is necessary to invest in policies and interagency initiatives that promote all domains and to ensure that the general population helps determine the scope and design of such policies.
- Sedentary Behavior and Health Outcomes: An Overview of Systematic Reviews(2014) REZENDE, Leandro Fornias Machado de; LOPES, Mauricio Rodrigues; REY-LOPEZ, Juan Pablo; MATSUDO, Victor Keihan Rodrigues; LUIZ, Olinda do CarmoObjective: 1) To synthesize the current observational evidence for the association between sedentary behavior and health outcomes using information from systematic reviews. 2) To assess the methodological quality of the systematic reviews found. Methodology/Principal Findings: Medline; Excerpta Medica (Embase); PsycINFO; and Web of Science were searched for reviews published up to September 2013. Additional publications were provided by Sedentary Behaviour Research Network members. The methodological quality of the systematic reviews was evaluated using recommended standard criteria from AMSTAR. For each review, improper use of causal language in the description of their main results/conclusion was evaluated. Altogether, 1,044 review titles were identified, 144 were read in their entirety, and 27 were included. Based on the systematic reviews with the best methodological quality, we found in children and adolescents, strong evidence of a relationship between time spent in sedentary behavior and obesity. Moreover, moderate evidence was observed for blood pressure and total cholesterol, self-esteem, social behavior problems, physical fitness and academic achievement. In adults, we found strong evidence of a relationship between sedentary behavior and all-cause mortality, fatal and non-fatal cardiovascular disease, type 2 diabetes and metabolic syndrome. In addition, there is moderate evidence for incidence rates of ovarian, colon and endometrial cancers. Conclusions: This overview based on the best available systematics reviews, shows that sedentary behavior may be an important determinant of health, independently of physical activity. However, the relationship is complex because it depends on the type of sedentary behavior and the age group studied. The relationship between sedentary behavior and many health outcomes remains uncertain; thus, further studies are warranted.
- The Role of School Environment in Physical Activity among Brazilian Adolescents(2015) REZENDE, Leandro Fornias Machado de; AZEREDO, Catarina Machado; SILVA, Kelly Samara; CLARO, Rafael Moreira; FRANCA-JUNIOR, Ivan; PERES, Maria Fernanda Tourinho; LUIZ, Olinda do Carmo; LEVY, Renata Bertazzi; ELUF-NETO, JoseObjective To analyze the association of physical activity facilities and extracurricular sports activities in schools with physical activity among adolescents. Methodology/Principal Findings We used data collected for the National Survey of School Health in 2012. The national representative sample comprised 109,104 Brazilian students from 2,842 schools. We calculated the prevalence of participation in physical education classes, leisure-time physical activity, and total physical activity level. We also evaluated the following physical activity facilities: sports courts, running/athletics tracks, schoolyard with teacher-directed physical activities, swimming pools, locker rooms; and the offer of extracurricular sports activities. Schools with at least one physical activity facility had increased odds of participation in physical education (OR 1.59; 95% CI 1.20 to 2.10). However, in order to increase leisure-time physical activity (OR 1.14; 95% CI 1.03 to 1.26) and total physical activity level (OR 1.15; 95% CI 1.06 to 1.24) at least four and two facilities, respectively, were necessary. Extracurricular sports activities in schools were positively associated with leisure-time physical activity and physical activity level. The number of sports courts and swimming pool in a school were associated with participation in physical education classes. Availability of sports courts, running/athletics tracks, and swimming pool in schools were associated with leisure-time physical activity. Total physical activity was associated with schools with sports courts, schoolyard with teacher-directed physical activities, and swimming pool. Conclusions School-level characteristics have important potential to increase the possibility of engagement in physical activity in and out of school, and therefore have a fundamental role in promoting these practices.
- Personal, relational and school factors associated with involvement in fights with weapons among school-age youth in Brazil: a multilevel ecological approach(2018) PERES, Maria Fernanda Tourinho; AZEREDO, Catarina Machado; REZENDE, Leandro Fornias Machado de; ZUCCHI, Eliana Miura; FRANCA-JUNIOR, Ivan; LUIZ, Olinda do Carmo; LEVY, Renata BertazziObjectivesTo investigate the association between personal, relational and school factors with involvement in fights with weapon among Brazilian school-age youth.MethodsUsing data from the Adolescent School-Based Health Survey 2015 (n=102.072), we conducted multilevel logistic regression models.ResultsIFW was associated with female sex (OR=0.45), and with older age (OR=1.15), previous involvement in physical violence (OR=2.05), history of peer verbal (OR=1.14) and domestic victimization (OR=2.11), alcohol use (OR=2.42) and drug use (OR=3.23). The relational variables (e.g., parent's supervision) were mostly negatively associated with IFW. At the school level, attending public school and attending schools in violent surroundings were both positively associated with IFW. The intraclass correlation coefficient estimated in the empty model showed that 5.77% of the variance of IFW was at school level. When all individual- and school-level variables were included in the model, the proportional changes in variance were 61.7 and 71.55%, respectively.ConclusionsIFW is associated with personal, relational and school factors. Part of the variance in IFW by school is explained by characteristics of the school context.