Hypertension and Different Levels of Body Mass Index and Cardiorespiratory Fitness Amongst Adolescents

Abstract Background Hypertension is an increasingly common problem in adolescents; amongst the associated factors, physical inactivity and obesity are increasing the risk of developing cardiovascular diseases. Objective To verify whether there is an association between higher blood pressure levels amongst adolescents with the relationship between different levels of body mass index (BMI) and cardiorespiratory fitness (CRF). Method Cross-sectional study consisting of 860 adolescents. Higher blood pressure (BP) was considered as borderline and hypertension as the classification. BMI was categorized as low-normal weight and overweight-obesity. The CRF was assessed by a nine-minute run/walk test and classified into low or appropriate levels (less and more favorable to health, respectively). Later, BMI and CRF were grouped into one categorical variable: (I) low/normal weight and appropriate CRF levels; (II) low/normal weight and low CRF levels; (III) overweight/obesity and appropriate CRF levels; and (IV) overweight/obesity and low CRF levels. Data were analyzed using Poisson regression, through the prevalence ratio (PR) and 95% confidence intervals (CI). The p-values of p <0.05 were considered significant. Results Adolescents with overweight/obesity and low CRF levels had a 22% higher BP prevalence. Moreover, children with overweight/obesity, but with appropriate CRF levels, have a 15% higher BP prevalence. Conclusion Adolescents with overweight/obesity had a higher prevalence of BP, regardless of CRF levels. It is suggested that maintaining normal BMI is a protective factor for less favorable BP.

Association between the screen time and the cardiorespiratory fitness with the presence of metabolic risk in schoolchildren / Associação entre o tempo de tela e a aptidão cardiorrespiratória e a presença de risco metabólico em escolares

ABSTRACT Objective: To verify the association between screen time and cardiorespiratory fitness with the presence of metabolic risk in schoolchildren in an isolated and clustered manner. Methods: Cross-sectional study with 1.200 schoolchildren from Santa Cruz do Sul-RS. Screen time and cardiorespiratory fitness were evaluated. The continuous metabolic risk score was calculated by summing the Z score of the waist circumference, systolic blood pressure, glucose, triglycerides, total cholesterol, low-density lipoprotein (LDL-C) and high-density lipoprotein (HDL-C). Results: Children (34.3%) and adolescents (48.2%) had high screen time, while 44.3% of the children and 53.3% of the adolescents were unfit in relation to cardiorespiratory fitness. Regarding the relation of screen time/cardiorespiratory fitness, 14.7% of the children and 26.9% of the adolescents presented high screen time and low levels of cardiorespiratory fitness. The presence of metabolic risk was shown in children (17.1%) and adolescents (14.7%). The presence of metabolic risk was directly associated with low levels of cardiorespiratory fitness in children and adolescents. When analyzed in clusters, the metabolic risk in children was 11% more prevalent in subjects with low screen time/unfit and 12% in subjects with high screen time/unfit, whereas in adolescents, the prevalence of metabolic risk was also higher in those with low screen time/unfit (8%) and high screen time/unfit (7%). Conclusions: The presence of metabolic risk in children and adolescents was associated with low levels of cardiorespiratory fitness, independent of screen time, in an isolated or clustered manner.

RESUMO Objetivo: Verificar a associação entre tempo de tela e aptidão cardiorrespiratória, de forma isolada e agrupada, e a presença de risco metabólico em escolares. Métodos: Estudo transversal com 1.200 escolares de Santa Cruz do Sul (RS). Foram avaliados o tempo de tela e a aptidão cardiorrespiratória. Foi calculado o escore de risco metabólico por meio da soma do escore Z, da circunferência da cintura, da pressão arterial sistólica, da glicose, dos triglicerídeos, do colesterol total, do colesterol da lipoproteína de baixa densidade (LDL) e do colesterol da lipoproteína de alta densidade (HDL). Resultados: Crianças (34,3%) e adolescentes (48,2%) apresentaram elevado tempo de tela, enquanto 44,3% das crianças e 53,3% dos adolescentes foram inaptos no tocante à aptidão cardiorrespiratória. Na relação tempo de tela/aptidão cardiorrespiratória, 14,7% das crianças e 26,9% dos adolescentes exibiram elevado tempo de tela e baixos níveis de aptidão cardiorrespiratória. A presença de risco metabólico foi evidenciada em crianças (17,1%) e em adolescentes (14,7%). A presença de risco metabólico esteve associada diretamente com baixos níveis de aptidão cardiorrespiratória nas crianças e nos adolescentes no que se refere às variáveis de forma isolada. Quando analisado de modo agrupado, o risco metabólico em crianças foi 11% mais prevalente em sujeitos com baixo tempo de tela/inaptos e 12% em sujeitos com elevado tempo de tela/inaptos, enquanto em adolescentes a prevalência de risco metabólico também foi superior nos escolares com baixo tempo de tela/inaptos (8%) e elevado tempo de tela/inaptos (7%). Conclusões: A presença de risco metabólico em crianças e adolescentes esteve associada com baixos níveis de aptidão cardiorrespiratória, independentemente do tempo de tela, tanto de modo isolado quanto agrupado.

Obesidade, perfil lipídico e hábitos alimentares de escolares: comparação entre municípios de dois estados da região Sul do Brasil / Obesity, lipid profile and feeding habits in school children: comparing municipalities in t wo brazilian southern states

O objetivo foi comparar o perfil nutricional, lipídico e hábitos alimentares de escolares de dois municípios do sul do Brasil. O estudo transversal avaliou indicadores de obesidade, perfil lipídico e hábitos alimentares de escolares de 7-17 anos, de Santa Cruz do Sul­RS e Chapecó­SC. Observou-se diferença (p<0,05) no sobrepeso/obesidade (37,0% Chapecó vs 29,2% Santa Cruz do Sul) e circunferência da cintura elevada (34,8% Chapecó vs 21,2% Santa Cruz do Sul); triglicerídeos (41,4%) e HDL-C (23,5%) foram mais elevados em Chapecó (p<0,001) e colesterol total (56,1%), LDL-C (36,4%) e glicemia (8,7%) em Santa Cruz do Sul (p<0,05). Chapecó apresenta maior consumo de frutas (16,8% infrequente) e doces (41,3% frequente) e Santa Cruz do Sul de feijão/arroz (57,0% diário), refrigerantes (24,4% diário) e salgadinhos (24,0% diário) p<0,05. Conclui-se que houve diferenças no perfil nutricional, lipídico e hábitos alimentares entre dois municípios, demonstrando que indicadores de saúde podem variar em diferentes regiões.

Nutritional, lipid and feeding habits of school children in two municipalities in South Brazil are compared. Transversal study analyzed indicators of obesity, lipid profile and feeding habits of school children, aged between 7 and 17 years, in Santa Cruz do Sul RS Brazil, and Chapecó SC Brazil. Difference (p<0.05) in overweight/obesity (37.0% Chapecó vs 29.2% Santa Cruz do Sul) and high waist circumference (34.8% Chapecó vs 21.2% Santa Cruz do Sul); triglycerides (41.4%) and HDL-C (23.5%) showed higher rates in Chapecó (p<0.001); total cholesterol (56.1%), LDL-C (36.4%) and glycaemia (8.7%) were higher in Santa Cruz do Sul (p<0.05). Chapecó had a high input of fruit (16.8% infrequent) and sweets (41.3% frequent) contrasting with beans/rice (57.0% daily), soft drinks (24.4% daily) and snacks (24.0% daily) in Santa Cruz do Sul (p<0.05). Results show that differences in nutritional profile existed between the two municipalities and, consequently, health indicators vary within different regions.

Perfil sociodemográfico associado em nível de aptidão física relacionada à saúde em escolares / Social and demographic profile associated to physical capacity level related to school children´s health

Este estudo teve como objetivo verificar se existe associação entre fatores sociodemográficos e níveis de aptidão física relacionada à saúde em escolares. Foram sujeitos deste estudo transversal 1.000 crianças e adolescentes, de sete a 17 anos de idade, de Santa Cruz do Sul-RS. Analisou-se o nível socioeconômico, o perfil nutricional, a flexibilidade, a resistência abdominal e a aptidão cardiorrespiratória (APCR). Todas as análises foram realizadas no programa estatístico SPSS v. 23.0, considerando um nível de significância de p<0,05. Resultados demonstraram que a prevalência de sobrepeso/obesidade foi superior no sexo masculino (RP: 1,05; p=0,025) e inferior entre os adolescentes (RP: 0,89; p<0,001). Por outro lado, escolares do sexo masculino apresentam prevalência 6% menor de baixos níveis de APCR (p=0,001). Adolescentes (RP: 1,07; p=0,005), estudantes da rede municipal (RP: 1,10; p=0,049) e da zona urbana (RP: 1,09; p=0,002) apresentam maior prevalência de baixos níveis de APCR. Concluiu-se que fatores sociodemográficos estão associados aos baixos níveis de aptidão física em escolares.

The association between socio-demographic and physical capacity levels related to school children´s health is investigated. Current transversal study comprised 1000 children and adolescents, aged between 7 and 17 years, in Santa Cruz do Sul RS Brazil. The socio-economic level, nutritional profile, flexibility, abdominal resistance and cardiorespiratory fitness (CRF) were analyzed with statistical program SPSS v. 23.0, at significance level p<0.05. Results demonstrated that prevalence of overweight/obesity was higher in males (PR: 1.05; p=0.025) and lower among adolescents (PR: 0.89; p<0.001). Moreover, male school children had a 6% prevalence lower than APCR low levels (p=0.001). Adolescents (PR: 1.07; p=0.005), school children in public schools (PR: 1.10; p=0.049) and students from the rural area (PR: 1.09; p=0.002) had a higher prevalence in APCR low levels. Socio-demographic factors are actually associated to low levels of physical capacity in school children.