ABSTRACT. Purslanes are frequently used in Brazil as potted plants and for landscaping because of their beautiful colored flowers. Despite their commercial importance, the genetic diversity within ornamental purslane remains largely unknown. Thus, a complete characterization of ornamental purslane resources is essential for its utilization since genetic variability is indispensable for the efficient development of new cultivars. This study aimed to evaluate genetic variability and recommend accessions to start a genetic breeding program for purslane (Portulaca umbraticola). Twenty purslane accessions were collected in public places in Areia City and Santa Rita City, Paraiba State, Brazil. The experiment was conducted in a greenhouse. An entirely randomized experimental design with 20 accessions and 5 replicates was utilized. Plants were evaluated for quantitative and qualitative traits. Data were submitted to analysis of variance and grouped by Scott-Knott’s criteria (p ≤ 0.05). The accessions were grouped using Tocher’s method based on the generalized Mahalanobis distance. Principal component analysis was also used to analyze the genetic divergence. There were significant differences (p ≤ 0.05) for all evaluated traits except for internode distance, plant height, and leaf length. The Scott-Knott criteria clustered the accessions into two groups for all traits except days to flowering (five groups). Tocher’s grouping based on Mahalanobis distance allowed the accessions to be separated into eight clusters. The genetic diversity observed in this study was supported by the consonance between the Tocher cluster method and the PC analyses. The traits that most contributed to genetic divergence among accessions were days to flowering (70.37%), flower length (6.10%), leaf width (3.89%), branch number (3.57%), and stem length (3.36%). Considering the criteria for use in outdoor spaces, wider plants with several large colored flowers, thicker stems, greener leaves, and earliness were interesting. Accessions 5, 7, 13, 14, 16, 18, and 20 should be selected as parents for further breeding programs. However, if the objective is to produce potted plants, dwarf plants with bigger leaves are desired, and accession 1 should be selected. This will create greater variability in segregating populations, which will increase the overall quality of ornamental use of this species. For those accessions with no reproductive verticils but with other excellent attributes, for example, high chlorophyll content breeding strategies, such as induced mutations or protoplast fusion, can be used.

Abstract Microsatellites have been widely used to genotype individuals and to address a myriad of biological questions in many research fields for decades. However, when implementing a microsatellite marker analysis routine from scratch, various problems can arise throughout the process from DNA extraction to allele scoring, including inputting errors in the database, decreasing the reliability of results and having profound negative impacts on the derived decisions. Therefore, correctly assigning a genotype to a sample is crucial and dependent on acquiring knowledge of the technique steps, such as the chemistry of reactions, software, and data curation. This study tested two previously constructed simple sequence repeat (SSR) sets containing ten primer pairs each (ten-plex) in 1142 maize genotypes. Here, we describe the challenges faced when implementing this microsatellite-based genotyping protocol in our laboratory and possible ways to overcome them, hopefully aiding other novice research teams in this field.

ABSTRACT Objective: To describe, within the Human Rights to Water and Sanitation (HRWS) framework, the access to water supply services and the incidence of waterborne diseases in the communities affected by the dam disaster in Brumadinho (MG), Brazil. Methods: A quantitative and qualitative methodology was used, having as variables information on access to water supply services and waterborne diseases. The primary data were extracted from the “Brumadinho Health Project”, using a sample stratum with 981 people interviewed, totaling 92.5% of the eligible population in the affected communities of Córrego do Feijão and Parque da Cachoeira. The secondary data from Brumadinho was extracted from the project “Sanitation conditions and the River Basin of the B1 River Basin of Mineradora Vale between 2017 and 2020”, available in public databases between 2017 and 2020, and qualitative data was collected in 2022 through individual interviews with health professional also live in the communities. Results: With regard to access to water supply services, the results of this combined data analysis indicate that the HRWS is being neglected, especially with regard to availability, accessibility, acceptability and quality of water. The study also shows a significant increase in the incidence of waterborne diseases in the region after the disaster. Conclusion: It is necessary to use the HRWS as the basis to the implementation of public policies aiming to reduce vulnerability in access to water supply services.

RESUMO Objetivo: Descrever, na ótica dos direitos humanos à água e ao esgotamento sanitário (DHAES), o acesso à água e a incidência de doenças de veiculação hídrica na região atingida pelo rompimento da barragem da Mina B1 em Brumadinho (MG). Métodos: Utilizou-se a metodologia quantitativa e qualitativa, tendo como variáveis, em ambos os métodos, informações sobre o acesso à água e as doenças de veiculação hídrica. Os dados primários foram extraídos do Projeto de Saúde Brumadinho, sendo aqui utilizado um estrato amostral com 981 pessoas entrevistadas, totalizando 92,5% da população elegível das comunidades atingidas de Córrego do Feijão e Parque da Cachoeira. Os dados secundários de Brumadinho foram coletados pelo Projeto Condições de Saneamento e Saúde da População da Bacia do Rio Paraopeba, a Jusante da Barragem B1 da Mineradora Vale, entre 2017 e 2020, em banco de dados públicos entre 2017 e 2020, e os dados qualitativos foram coletados em 2022 por meio de entrevistas individuais com profissionais de saúde residentes nas comunidades atingidas. Resultados: No tocante ao acesso à água, a análise combinada dos dados apontou que os DHAES estão sendo negligenciados na região, de maneira especial no que se refere à disponibilidade, acessibilidade física, aceitabilidade e qualidade da água. Observou-se também que houve aumento significativo na incidência das doenças de veiculação hídrica na região após o desastre. Conclusão: É necessária utilização dos DHAES como marco referencial na implementação de políticas públicas voltadas para reduzir as situações de vulnerabilidade relacionadas ao acesso à água.

RESUMO Objetivo: Investigar a prevalência e os fatores associados ao risco de suicídio em estudantes do ensino médio de uma instituição federal de ensino do Rio Grande do Sul (IFRS). Métodos: Trata-se de um estudo transversal realizado com base em um censo de estudantes (n=510) matriculados no IFRS, Campus Rio Grande, no segundo semestre de 2019. Os dados foram coletados por meio de questionário autoaplicável. O risco de suicídio foi medido com o instrumento Mini-International Neuropsychiatric Interview e a análise dos dados foi conduzida por meio de regressão de Poisson com ajuste robusto da variância. Resultados: A prevalência do risco alto de suicídio foi de 17,3% (intervalo de confiança — IC95% 14,0–20,0), tendo como fatores independentemente associados: sexo feminino, maior nível socioeconômico, consumo de álcool, menor suporte social, tentativa de perder peso, comportamento autolesivo e maior risco de depressão, ansiedade e estresse. Conclusões: Um em cada seis estudantes apresentou elevado risco de suicídio. A identificação dos fatores associados ao desfecho é útil para identificar os casos mais graves e encaminhá-los para atendimento especializado.

ABSTRACT Objective: To investigate the prevalence and factors associated with suicide risk among high school students from a federal educational institution in Rio Grande do Sul (IFRS). Methods: This is a cross-sectional study based on a census of students (n=510) enrolled in IFRS, campus Rio Grande, in the second half of 2019. Data were collected through a self-administered questionnaire. Suicide risk was measured with the instrument Mini-International Neuropsychiatric Interview, and data were analyzed using Poisson regression with robust variance adjustment. Results: The prevalence of high suicide risk was 17.3% (95% confidence interval — 95%CI 14.0–20.0), with the following independent associated factors: female gender, higher socioeconomic status, alcohol consumption, less social support, attempt to lose weight, self-harm behavior, and increased risk of depression, anxiety, and stress. Conclusions: One in six students showed a high suicide risk. The identification of factors associated with the outcome is useful for detecting the most severe cases and referring them to specialized care.

RESUMO Objetivo: Descrever, na ótica dos direitos humanos à água e ao esgotamento sanitário (DHAES), o acesso à água e a incidência de doenças de veiculação hídrica na região atingida pelo rompimento da barragem da Mina B1 em Brumadinho (MG). Métodos: Utilizou-se a metodologia quantitativa e qualitativa, tendo como variáveis, em ambos os métodos, informações sobre o acesso à água e as doenças de veiculação hídrica. Os dados primários foram extraídos do Projeto de Saúde Brumadinho, sendo aqui utilizado um estrato amostral com 981 pessoas entrevistadas, totalizando 92,5% da população elegível das comunidades atingidas de Córrego do Feijão e Parque da Cachoeira. Os dados secundários de Brumadinho foram coletados pelo Projeto Condições de Saneamento e Saúde da População da Bacia do Rio Paraopeba, a Jusante da Barragem B1 da Mineradora Vale, entre 2017 e 2020, em banco de dados públicos entre 2017 e 2020, e os dados qualitativos foram coletados em 2022 por meio de entrevistas individuais com profissionais de saúde residentes nas comunidades atingidas. Resultados: No tocante ao acesso à água, a análise combinada dos dados apontou que os DHAES estão sendo negligenciados na região, de maneira especial no que se refere à disponibilidade, acessibilidade física, aceitabilidade e qualidade da água. Observou-se também que houve aumento significativo na incidência das doenças de veiculação hídrica na região após o desastre. Conclusão: É necessária utilização dos DHAES como marco referencial na implementação de políticas públicas voltadas para reduzir as situações de vulnerabilidade relacionadas ao acesso à água.

ABSTRACT Objective: To describe, within the Human Rights to Water and Sanitation (HRWS) framework, the access to water supply services and the incidence of waterborne diseases in the communities affected by the dam disaster in Brumadinho (MG), Brazil. Methods: A quantitative and qualitative methodology was used, having as variables information on access to water supply services and waterborne diseases. The primary data were extracted from the “Brumadinho Health Project”, using a sample stratum with 981 people interviewed, totaling 92.5% of the eligible population in the affected communities of Córrego do Feijão and Parque da Cachoeira. The secondary data from Brumadinho was extracted from the project “Sanitation conditions and the River Basin of the B1 River Basin of Mineradora Vale between 2017 and 2020”, available in public databases between 2017 and 2020, and qualitative data was collected in 2022 through individual interviews with health professional also live in the communities. Results: With regard to access to water supply services, the results of this combined data analysis indicate that the HRWS is being neglected, especially with regard to availability, accessibility, acceptability and quality of water. The study also shows a significant increase in the incidence of waterborne diseases in the region after the disaster. Conclusion: It is necessary to use the HRWS as the basis to the implementation of public policies aiming to reduce vulnerability in access to water supply services.

Resumo: O presente estudo tematiza o racismo na sociedade de classes e tem como objetivo analisar os desdobramentos das desigualdades raciais na pandemia da Covid-19. Logo, utilizou-se o método materialismo histórico-dialético e uma abordagem qualitativa. Dessa forma, foi realizada uma pesquisa bibliográfica e documental, além de um trabalho de mapeamento a partir dos dados secundários do Instituto Brasileiro de Geografia e Estatística (IBGE) de 2019; Atlas da violência de 2020, elaborado pelo Instituto de Pesquisa Econômica Aplicada (IPEA); e o Boletim especial 20 de novembro de 2021, do Departamento Intersindical de Estatística e Estudos Socioeconômicos (DIEESE), para dialogar com a realidade dos afro-brasileiros em cenário pandêmico. Dos resultados do estudo, destacamos: que o racismo tem sido um eixo estruturante da sociedade brasileira mesmo numa fase pós-abolicionista; e que a questão racial tem sido uma das expressões da questão social na sociedade do capital, de tal modo que as desigualdades são conexas na contemporaneidade; e ainda, que a pandemia acentuou as desigualdades raciais no Brasil.

Abstract: The present study thematizes racism in class society and aims to analyze the consequences of racial inequalities in the covid-19 pandemic. Therefore, the Historical-Dialectical Materialism method and a qualitative approach were used. In this way, a bibliographic and documentary research was carried out, in addition to a mapping work based on secondary data from the Brazilian Institute of Geography and Statistics (IBGE) of 2019, Atlas of Violence of 2020 made by the Institute of Applied Economic Research (IPEA) and the Special Bulletin 20 November 2021 of the Inter-union Department of Statistics and Socioeconomic Studies (DIEESE) to dialogue with the reality of Afro-Brazilians in a pandemic scenario. From the results of the study, we highlight that racism has been a structuring axis of Brazilian society even in a post-abolitionist phase; that the Racial Question has been one of the expressions of the Social Question in the society of Capital, in such a way that inequalities are connected in contemporaneity; and, that the pandemic accentuated racial inequalities in Brazil.

RESUMO Este artigo tem como objetivo analisar as relações simbólicas entre os professores formadores do curso de Licenciatura em Química dos Institutos Federais de Santa Catarina a partir das disposições incorporadas ao longo da trajetória pessoal, acadêmica e profissional (habitus e capitais). Para alcançar esse objetivo proposto, definiu-se como instrumentos para construção dos dados de pesquisa a entrevista semiestruturada e a análise documental. Foram realizadas entrevistas com 7 professores formadores que atuam nos cursos de Licenciatura em Química dos Institutos Federais de Santa Catarina. Por sua vez, a análise documental obteve dados a partir do currículo lattes desses docentes entrevistados e de informações sobre a distribuição da carga horária desses professores formadores, disponíveis nos sites dos Institutos Federias em que eles atuam. Na análise dos dados, duas categorias principais se sobressaem: classe social e capitais, sendo que os capitais identificados são: cultural, social, político e acadêmico-científico. Dessa forma, a partir dos conceitos de habitus e capital de Pierre Bourdieu, analisa-se as classes sociais de origem dos professores formadores e os capitais acumulados por eles ao longo de sua trajetória pessoal, acadêmica e profissional, que constituem seu habitus. Ainda, a partir dos capitais acumulados pelos professores formadores, destaca-se a organização das relações simbólicas entre os agentes nesse espaço.

ABSTRACT This article aims to analyze the symbolic relationships between the teacher educators of the Degree in Chemistry at the Federal Institutes of Santa Catarina - Brazil based on provisions incorporated throughout their personal, academic, and professional trajectory (habitus and capitals). To achieve this proposed objective, semi-structured interviews and document analysis were defined as instruments for the construction of research data. Interviews were conducted with 7 teacher educators who work in the Degree of Chemistry at the Federal Institutes of Santa Catarina - Brazil. In turn, the document analysis obtained data from the lattes curriculum of these teachers interviewed and from information on the distribution of the workload of these teacher educators available on the websites of the Federal Institutes of Santa Catarina - Brazil where they work. In the data analysis, two main categories stand out: social class and capitals, and the identified capitals are: cultural, social, political, and academic-scientific. Thus, based on Pierre Bourdieu’s concepts of habitus and capital, the social classes of origin of the teacher educators and the capital accumulated by them throughout their personal, academic and professional trajectory, which constitute their habitus, are analyzed. Also, based on the capital accumulated by the teacher educators, the organization of symbolic relations between the agents in this space is highlighted.

Abstract The aim of this study was to evaluate and correlate modifications of vaginal mucous impedance, vulvar temperature and ultrasonographic measurements (echobiometric parameters) to parturition in pregnant Saanen does. 30 does were selected for the study and submitted to an estrus synchronization protocol and natural mating. The females were evaluated daily from Day 143 of pregnancy to parturition. For the sonographic evaluations, the following structures were measured: biparietal diameter, thoracic diameter, abdominal diameter, ocular orbit, kidney length, kidney height, cardiac area, placentome length, cervical measurement and fetal heart rate; by means of two different approaches: transrectal and transabdominal, using a 7.5 MHz linear transducer. The vaginal mucous impedance was assessed using an electric estrous detector and vulvar temperature was measured using a non-contact infrared thermometer. Statistical analysis was performed using the R-project software and the significance level was set at 5% for all tests. 25 Saanen does became pregnant, resulting in 80.33% pregnancy rate. Fetal heart rate was negatively correlated to the hours to parturition (p<0,001; r-Pearson= -0,451), as well as vaginal temperature (p= 0,001; r-Pearson= -0,275), while cervical thickness was positively correlated to hours to parturition (p<0,001; r-Pearson= 0,490). The echobiometric parameters (biparietal diameter, thoracic diameter, abdominal diameter, ocular orbit, kidney length and height, cardiac area, placentome length), as well as vaginal mucous impedance did not vary throughout the timepoints of evaluation and did not correlate to the moment of parturition. It was concluded that the parameters of fetal heartbeat, vaginal temperature and cervical effacement in the last week of pregnancy provide valuable information regarding the proximity of parturition.

Abstract The aim of this study was to investigate uterine involution using ultrasonography techniques during postpartum. Postpartum ultrasonography evaluation (B-mode, color Doppler and Acoustic Radiation Force Impulse elastography) of the uterus was performed by transabdominal approach at immediate after birth and sequentially every 48 hours, during 30 days. The uterine echotexture did not present significant variations (P >0.05) being homogeneous in most evaluations; echogenicity of the uterus increased along the evaluation period (P =0.0452). Progressive and remarkable decrease of the total uterine diameter (UD) were observed (P <0.0001), especially during the first days postpartum. The thickness of uterine wall gradually decreased, as well the endometrial, myometrium and lumen diameters (P <0.0001). Uterine blood flow was assessed by Doppler and decreased during postpartum period, being significantly lower (P=0.0225) on the 30th day of postpartum. Uterine parenchyma presented as homogeneous dark areas (not deformable) on qualitative ultrasound elastography and the means shear velocity values of the uterine wall on quantitative elastography did not differ. This is the first study that evaluate the stiffness of uterine wall in healthy ewes, providing baseline data about quantitative and qualitative stiffness of the normal uterus, and it may be a useful tool for early diagnosis of uterine alterations during the postpartum period, using the reference parameter established for the assessment of uterine integrity during postpartum period.

Resumo O presente artigo propõe uma reflexão sobre trabalhos análogos à escravidão no Brasil e que têm sido bastante utilizados dentro das práticas empresariais do capital global. Trata-se de tema pouco explorado nas pesquisas em Administração. Nesse sentido, o objetivo central, neste artigo, é analisar os desdobramentos dos trabalhos análogos à escravidão no século XXI. Quanto ao método, usou-se o enfoque materialista histórico-dialético, além de uma abordagem qualitativa contemplada em pesquisas bibliográficas e documentais. Para análise da investigação, entre casos notificados nos anos de 1995 a 2022, foram utilizados os dados secundários de autuação do Ministério do Trabalho e Previdência, bem como sua “lista suja” do trabalho escravo e, ainda, os dados do Radar SIT. Além disso, este escrito tem aporte de matérias jornalísticas que retratam as fiscalizações do trabalho escravo moderno, possibilitando assim exemplificações de suas práticas na coetaneidade. Como resultado, percebeu-se que a própria falta de políticas públicas mais assertivas e a fragilidade da aplicabilidade penal da legislação brasileira têm sido fatores de dificuldade para a erradicação do trabalho escravo moderno no país.

Abstract This article proposes a reflection on Brazil and its works analogous to slavery that has been widely used within the business practices of global capital and is a topic little explored in administration research. The article analyzes the unfolding of works analogous to slavery in the 21st century. This qualitative study consists of a bibliographic and documentary research based on the perspective of dialectical and historical materialism. It analyzes secondary data from infraction notices from the Ministry of Labor and Welfare, the ministry’s list of companies engaged in slave labor, and data from Radar SIT (statistics and information dashboard of labor inspection in Brazil) between 1995 and 2022. In addition, this study collected information from journalistic articles that portrayed inspections of modern slave labor, thus enabling examples of this practice in contemporary times. The findings show that the very lack of more assertive public policies and the fragility of the criminal applicability of Brazilian legislation have challenged the eradication of modern slave labor in the country.

Resumen Este artículo propone una reflexión sobre Brasil y sus trabajos análogos a la esclavitud que han sido ampliamente llevados a cabo dentro de las prácticas empresariales del capital global y es un tema poco explorado en la investigación en Administración. En este sentido, el objetivo principal del artículo es analizar el desenvolvimiento de trabajos análogos a la esclavitud en el siglo XXI. En cuanto al método, se utilizó el materialismo histórico-dialéctico, además de un enfoque cualitativo contemplado en la investigación bibliográfica y documental y para el análisis de la investigación, datos secundarios de las actas de infracción del Ministerio del Trabajo y Previsión Social y su “lista sucia” del trabajo esclavo”, especialmente entre los años 1995 a 2022. Además, este escrito cuenta con el aporte de artículos periodísticos que retratan las inspecciones al trabajo esclavo moderno, lo que permite ejemplificar sus prácticas en la época contemporánea. Como resultado, se percibió que la propia falta de políticas públicas más asertivas y la fragilidad de la aplicabilidad penal de la legislación brasileña han sido factores de dificultad para la erradicación del trabajo esclavo moderno en el país.

ABSTRACT Peppers belongs to Capsicum genus and have a lot of different varieties. They can be different uses such as potted ornamental plants. Retail market for this type of pepper requires the development of a greater number of commercial cultivars with adequate ornamental characteristics as well as an extended shelf life (post-production). Ethylene exposure causes adverse effects in ornamental pepper post-production. Then, the goal of this study was to select ornamental pepper elite lines (Capsicum annuum L.) for ethylene-insensitive. The experiment was conducted at the Laboratory of Plant Biotechnology of the Center for Agricultural Sciences of the Federal University of Paraíba, Areia, PB. The experiment was arranged in a completely randomized design. Eight elite lineages and two control cultivars evaluated at three times 48, 72 and 96 hours after ethylene exposure were disposed in a split-plot arrangement. Each treatment was composed of ten repetitions. The data were submmited to analysis of variance, Scott-Knott criteria (5%), and regression analysis. The leaves demonstrated to be more sensitive to ethylene while fruits were more insensitive. It is recommended selection of UFPB lines: 56.8.24.1; 56.26.15.1 and 56.26.34.1 to participate in trials tests aiming at registration of new ethylene-insensitive cultivars.

Abstratc This work reports the production of low-tin Cu-Sn alloy coatings on carbon steel substrates using a bath containing CuCl2, SnCl2, and sodium citrate. In the first part of this study, the coatings were electrodeposited by direct and simple pulse current processes (DC and SPC, respectively). Different current density values were used, while the pulse frequency and duty cycle remained constant. Independent of the current mode used, low-tin Cu-Sn coatings, showing globular surface morphology and Cu6Sn5 as the main compositional phase, were produced. Both the current mode and the applied current density affected the anticorrosive properties of the coatings. The most protective DC and SPC coatings, showing Sn content < 3 wt.% and compact morphology, were prepared using j = 80 A m-2 and jc = 167 A m-2, respectively. High charge transfer resistance values were verified even after immersion for 24 h in 0.5 mol L-1 NaCl solution.

Abstract The objective was to evaluate the blood flow of the uterine artery (UA) and umbilical artery (UMB) in the physiological pregnancy of goats by means of Doppler throughout the gestational period. Twenty-five Saanen goats weighing 55 ± 10 kg and aged between 2 and 5 were evaluated weekly, from the 21st until the 143rd day of gestation, and daily from that period until parturition. Values for peak systolic velocity (PSV), end diastolic velocity (EDV) and resistance (RI) and pulsatility (PI) indices of the uterine and umbilical arteries were determined. The values obtained were correlated with gestational age by Spearman's test, tested for adjustment to regression models and compared with the number of fetuses by ANOVA. The umbilical cord was first visualized at 28 days. Of the variables evaluated, RIUMB and PIUMB correlated with gestational age (p<0.001; and 0.046; respectively) and RIUMB had a low negative correlation with the number of fetuses per pregnancy (p = 0.003; r- Spearman = - 0.218). PSVUMB and EDVUMB values did not correlate with gestational age (p=0.737 and 0.768, respectively), but there was a decrease in the mean values throughout pregnancy (PSVUMB= 0.07; 0.31 and EDVUMB= 0.01; 0.06) as well as the change in the flow pattern of the spectral trace. The mean values of the uterine artery dopplervelocimetric variables PSVUT, EDVUT, PIUT and RIUT did not correlate with gestational age (p= 0.324; 0.372, 0.143; 0.13; respectively). It is expected that the results obtained will contribute to a broader understanding of the hemodynamic changes resulting from pregnancy in goats.

Resumo Objetivo: Avaliar a prevalência do uso excessivo de redes sociais e identificar os seus fatores associados em estudantes do ensino médio do Sul do Brasil. Métodos: Trata-se de um estudo transversal de base populacional. Foram elegíveis para esta pesquisa todos os estudantes que estavam cursando o ensino médio no Instituto Federal do Rio Grande do Sul, campus Rio Grande, no 2º semestre de 2019. No total, 513 alunos participaram do estudo. A variável dependente deste estudo foi o uso excessivo de redes sociais, definido como mais de cinco horas por dia. Foram realizadas análises descritivas e bivariadas e, para verificar as associações, foi utilizada a regressão de Poisson, com ajuste robusto da variância. Resultados: A prevalência de estudantes que relataram uso excessivo de redes sociais foi de 35,9%. Os grupos mais suscetíveis a usar excessivamente as redes sociais foram: sexo feminino, cor de pele preta/parda e faixa etária entre 18 e 20 anos. Houve associação entre uso excessivo de redes sociais com tabagismo, risco de depressão, ansiedade e estresse, risco elevado de suicídio e uso de drogas. Conclusões: Mais de um terço dos estudantes usava em excesso as redes sociais. Esse comportamento esteve associado com desfechos negativos em saúde.

Abstract Objective: To assess the prevalence of excessive use of social media and associated factors, as well as possible health consequences in high school students in southern Brazil. Methods: This is a population-based cross-sectional study, conducted with high school students in the city of Rio Grande, RS. All students who were attending high school at the Federal Institute of Rio Grande do Sul, campus Rio Grande, were eligible for this research in the second semester of 2019. In total, 513 students participated in the study. The dependent variable was excessive use of social media, defined as more than five hours per day. Descriptive and bivariate analyses were carried out and the Poisson regression was used to verify associations, with robust adjustment of variance. Results: The prevalence of students who reported excessive use of social media was 35.9%. The groups that were most susceptible to excessive use of social media had the following profile: female, black/brown skin, aged between 18 and 20 years old, attending the first year of high school. Excessive use of social media was shown to be associated with smoking, risk of depression, anxiety and stress, high risk of suicide and drug use. Conclusions: More than a third of students used social media excessively. This behavior was associated with negative health outcomes.