Michael Pereira da Silva

Association between sedentary behavior and anthropometric and metabolic profiles among adolescents

El objetivo fue investigar la asociacion entre el comportamiento sedentario y el perfil antropometrico y metabolico en adolescentes en la ciudad de Curitiba, Parana. Los participantes fueron 572 adolescentes matriculados en las escuelas publicas. Se recogieron 8 ml de sangre para determinar el colesterol total (CT), LDL-c, HDL-c, trigliceridos y glucosa. Se midio la altura y el peso para calcular el indice de masa corporal. Los datos sobre la informacion personal, el nivel socioeconomico, el nivel de actividad fisica, el sedentarismo y el consumo alimentario se recogieron a traves de cuestionarios auto-completados. Se empleo la estadistica descriptiva, medidas de tendencia central y de proporcion, y la regresion logistica binaria para obtener la odds ratio con intervalo de confianza del 95% y p<0,05. La mitad de las chicas tenian el colesterol alto y existe una asociacion positiva significativa entre el tiempo total de pantalla y las variables metabolicas evaluadas en el estudio. Llegamos a la conclusion de que las chicas presentan el CT menos favorable que los ninos y el tiempo total de pantalla corresponde a las variables metabolicas.

High Blood Pressure in Adolescents of Curitiba: Prevalence and Associated Factors

Background Arterial hypertension is a major public health problem and has increased considerably in young individuals in past years. Thus, identifying factors associated with this condition is important to guide intervention strategies in this population. Objective To determine high blood pressure prevalence and its associated factors in adolescents. Methods A random sample of 1,242 students enrolled in public schools of the city of Curitiba (PR) was selected. Self-administered questionnaires provided family history of hypertension, daily energy expenditure, smoking habit, daily fat intake, and socioeconomic status. Waist circumference was measured following standardized procedures, and blood pressure was measured with appropriate cuffs in 2 consecutive days to confirm high blood pressure. Relative frequency and confidence interval (95%CI) indicated high blood pressure prevalence. Bivariate and multivariate analyses assessed the association of risk factors with high blood pressure. Results The high blood pressure prevalence was 18.2% (95%CI 15.2-21.6). Individuals whose both parents had hypertension [odds ratio (OR), 2.22; 95%CI 1.28-3.85] and those with high waist circumference (OR, 2.1; 95%CI 1.34-3.28) had higher chances to develop high blood pressure. Conclusion Positive family history of hypertension and high waist circumference were associated with high blood pressure in adolescents. These factors are important to guide future interventions in this population.

Step-Count Guidelines for Children and Adolescents: A Systematic Review.

BACKGROUND The aim of this systematic review was to identify the most optimal step-count cutoff for children and adolescents (5-19 years old) among guidelines currently available in the literature. METHODS The databases searched were PubMed, SportDiscus, Science Direct, Web of Science and LILACS. Studies were categorized into Health Cohort studies or Physical Activity (PA) Cohort studies according to the reference standard used. The quality of the studies was assessed using the QUADAS-2 instrument. RESULTS Six Health and 3 PA Cohort studies were included in the final pool of papers after Full Text reading. With the exception of a single study, studies demonstrated a high risk of methodological bias in at least 1 of the QUADAS-2 domains. Guidelines ranged from 10,000 to 16,000 steps/day for the Health studies (5-16 years old), and from 9,000 to 14,000 steps/day for PA studies (6-19 years old). Due to the high risk of methodological bias, none of the Health Cohort guidelines were endorsed. The PA Cohort study with the lowest risk of methodological bias suggested 12,000 steps/day for children and adolescents irrespective of gender. CONCLUSION PA Cohort studies demonstrated lower risk of methodological bias than Health Cohort studies. The optimal youth step-count guideline of 12,000 steps/day was endorsed.

Correlation of cardiorespiratory fitness with risk factors for cardiovascular disease in children with type 1 diabetes mellitus

UNLABELLED The objective of this study was to correlate CRF with cardiovascular risk factors in T1DM children. METHODS Fifty children and adolescents aged between 9 and 17 years with no diabetes complications and a mean diabetes duration of 4.6 years were selected. Antropometric, sexual maturation and blood pressure data were evaluated. CRF level was assessed with a 20-m shuttle run test. Laboratory tests were performed to verify fasting lipids and glycated hemoglobin. Statistical analyses were made with Pearson partial correlation, t test, and one-way ANOVA, with p≤0.05. RESULTS After adjustment for body adiposity and sexual maturity, inverse correlations among CRF and TC, TG, TC/HDL-C, TG/HDL-C, non-HDL-C, and SBP were statistically significant. Variables differing by sex included weight Z score, BMI Z score, skinfold thickness, percentage of body fat, and DBP. Boys had higher CRF compared to girls. CRF and TC differed significantly by sexual maturation status. CONCLUSION An inverse and significant relationship between CRF and most lipid profiles components and SBP in poor controlled T1DM children and adolescents was found, independently of body adiposity.

Fidedignidade de um questionário de comportamento sedentário em escolares

Objective: To evaluate the reliability of a sedentary behavior questionnaire. Methods: Cross-sectional study with 1,119 students from 9 to 15 years old from seven public schools in Curitiba, Parana, Brazil, between March and December 2015. The questionnaire consists of 13 items divided into five aspects (screen time, educational, cultural, social and transportation) in which the participants reported time spent in sedentary activities (hours and/or minutes) in a typical week. For the reliability analysis, two applications of the questionnaire were performed and the intraclass correlation coefficient evaluated the reproducibility, Bland–Altman scatter plot assessed the concordance between the two test-retest measurements, and Cronbachs alpha, the internal consistency of the questionnaire, adopting 5% as significance level. Results: The intraclass correlation coefficient and Cronbachs alpha presented values greater than 0.70, being higher on weekdays than on weekends. The two applications of the questionnaire presented a mean difference of 228.27 minutes/week, with 95% confidence interval of 175.86 to 280.68. The limits of agreement ranged from 2,015.33 to -1,558.79 minutes/week. Conclusion: The questionnaire presented satisfactory reliability and can be used to measure sedentary behavior in students from 9 to 15 years old of public schools.

ASSOCIAÇÃO ENTRE A PROVOCAÇÃO REFERENTE AO PESO CORPORAL E A ATIVIDADE FÍSICA EM ADOLESCENTES

ABSTRACT Objective: The aim of the study was to determine the association between weight-teasing and physical activity in students from public schools of Curitiba, Paraná (Southern Brazil). Methods: The sample consisted of 95 students (48 boys and 47 girls) aged 12 to 14 years old. The Perception of Weight Teasing (POTS) and The Perception of Weight Teasing during Physical Activity Scale assessed the frequency of weight-teasing experienced by the participants. Accelerometers measured physical activity. BMI assessed the weight status of the participants. Pearson correlations analyzed the association between the teasing and physical activity variables at a significance level of 0.05. Results: The relationship between teasing variables and physical activity was not significant. A large proportion of participants failed to meet the recommended levels of physical activity regardless of sex (72%), and girls were significantly less physically active than boys (56.3% of boys and 89.4% of girls; p<0.01). Conclusions: Some participants were targets of weight-teasing, but teasing was not related to physical activity. Interventions are necessary to educate middle school students about the harmful consequences of weight teasing.

Association of body mass index with the functional fitness of elderly women attending a physical activity program

Objective: to investigate the association between body mass index (BMI) and functional fitness levels linked to the Elderly in Movement Program of the city of Curitiba, in the state of Paraná, Brazil. Methods: The study is characterized as correlational and crosssectional. The sample consisted of 1,806 elderly female participants of the Elderly in Movement Program. The short version of the IPAQ was used to evaluate participation Palavras-chave: Aptidão Física. Idoso. Índice de Massa Corporal. http://dx.doi.org/10.1590/1981-22562017020.160160

Step-count guidelines referenced on 60-minutes of moderate/vigorous physical activity

The purpose of this study was to establish step-count guidelines for sixth-grade students and assess the ability of step-counts to discriminate between students achieving and not achieving 60-minutes of moderate to vigorous physical activity daily. 201 sixth-grade students completed the study. They wore a pedometer and an accelerometer at the waist level for one full day. ROC curves were used to establish step-count guidelines and determine the diagnostic accuracy of step-counts. Sixth grade students need 12,118 steps/day to reach adequate daily levels of physical activity. The AUC indicated good diagnostic accuracy of step-counts. Suggested step-count guidelines can be a useful tool for identifying children who need to increase their daily levels of physical activity. The step-count cutoff proposed in this study is adequate for discriminating between sixth grade students reaching and not reaching recommended levels of physical activity.

Associação entre comportamento sedentário e perfil antropométrico e metabólico entre adolescentes

El objetivo fue investigar la asociacion entre el comportamiento sedentario y el perfil antropometrico y metabolico en adolescentes en la ciudad de Curitiba, Parana. Los participantes fueron 572 adolescentes matriculados en las escuelas publicas. Se recogieron 8 ml de sangre para determinar el colesterol total (CT), LDL-c, HDL-c, trigliceridos y glucosa. Se midio la altura y el peso para calcular el indice de masa corporal. Los datos sobre la informacion personal, el nivel socioeconomico, el nivel de actividad fisica, el sedentarismo y el consumo alimentario se recogieron a traves de cuestionarios auto-completados. Se empleo la estadistica descriptiva, medidas de tendencia central y de proporcion, y la regresion logistica binaria para obtener la odds ratio con intervalo de confianza del 95% y p<0,05. La mitad de las chicas tenian el colesterol alto y existe una asociacion positiva significativa entre el tiempo total de pantalla y las variables metabolicas evaluadas en el estudio. Llegamos a la conclusion de que las chicas presentan el CT menos favorable que los ninos y el tiempo total de pantalla corresponde a las variables metabolicas.

Asociación entre sedentarismo y los perfiles metabólicos y antropométricos en adolescentes

El objetivo fue investigar la asociacion entre el comportamiento sedentario y el perfil antropometrico y metabolico en adolescentes en la ciudad de Curitiba, Parana. Los participantes fueron 572 adolescentes matriculados en las escuelas publicas. Se recogieron 8 ml de sangre para determinar el colesterol total (CT), LDL-c, HDL-c, trigliceridos y glucosa. Se midio la altura y el peso para calcular el indice de masa corporal. Los datos sobre la informacion personal, el nivel socioeconomico, el nivel de actividad fisica, el sedentarismo y el consumo alimentario se recogieron a traves de cuestionarios auto-completados. Se empleo la estadistica descriptiva, medidas de tendencia central y de proporcion, y la regresion logistica binaria para obtener la odds ratio con intervalo de confianza del 95% y p<0,05. La mitad de las chicas tenian el colesterol alto y existe una asociacion positiva significativa entre el tiempo total de pantalla y las variables metabolicas evaluadas en el estudio. Llegamos a la conclusion de que las chicas presentan el CT menos favorable que los ninos y el tiempo total de pantalla corresponde a las variables metabolicas.