Relative validity of a computer-based semi-quantitative FFQ for use in the Pelotas (Brazil) Birth Cohort Studies.

OBJECTIVE: To assess the relative validity of a FFQ developed for the Pelotas Birth Cohort Studies. DESIGN: Participants completed a ninety-two-food-item FFQ and then answered two 24-h recalls (24HR), one in-person interview and a second one by telephone, administered 14-28 d apart. Median and relative differences of energy, fifteen nutrients and eleven food groups were estimated based on the FFQ and the average of two 24HR. Nutrients were log-transformed and energy-adjusted using residual method. Validity was assessed by crude, energy-adjusted and de-attenuated Pearson and Lin's concordance correlation coefficients. Agreement of quartiles and weighted κ were performed. Differences in energy and nutrient estimations between methods were plotted in Bland-Altman graphs. SETTING: Pelotas, southern Brazil. PARTICIPANTS: Two hundred fifty-four participants randomly selected from the 1993 Pelotas Birth Cohort during the 22-year follow-up (2015). RESULTS: The FFQ overestimated energy and most nutrients and food groups compared with the two 24HR. Energy-adjusted and de-attenuated Pearson correlation coefficients ranged from 0·21 to 0·66. The highest energy-adjusted and de-attenuated concordance correlation coefficients were observed for Ca (0·48), niacin (0·32), Na (0·29), vitamin C (0·28) and riboflavin (0·25). The percentage of nutrients classified into the same and opposite quartiles ranged from 36·5 to 60·3 %, and from 4·8 to 19·1 %, respectively. Weighted κ was moderate for Ca (0·51), beans and legumes (0·50) and milk and dairies (0·49). CONCLUSIONS: The FFQ provides a reasonable dietary intake assessment for habitual food consumption. However, the relative validity was weak for specific nutrients and food groups.

Influence of maternal pre-pregnancy nutritional status on offspring anthropometric measurements and body composition in three Brazilian Birth Cohorts.

OBJECTIVE: We aimed at evaluating the association of maternal pre-pregnancy nutritional status with offspring anthropometry and body composition. We also evaluated whether these associations were modified by gender, diet and physical activity and mediated by birth weight. DESIGN: Birth cohort study. SETTING: Waist circumference was measured with an inextensible tape, and fat and lean mass were measured using dual-energy X-ray absorptiometry. Multiple linear regression was used to adjust for possible confounders and allele score of BMI. We carried out mediation analysis using G-formula. PARTICIPANTS: In 1982, 1993 and 2004, all maternity hospitals in Pelotas (South Brazil) were visited daily and all live births whose families lived in the urban area of the city were evaluated. These subjects have been followed up at different ages. RESULTS: Offspring of obese mothers had on average higher BMI, waist circumference and fat mass index than those of normal weight mothers, and these differences were higher among daughters. The magnitudes of the association were similar in the cohorts, except for height, where the association pattern was not clear. In the 1982 cohort, further adjustment for a BMI allele score had no material influence on the magnitude of the associations. Mediation analyses showed that birth weight captured part of this association. CONCLUSIONS: Our findings suggest that maternal pre-pregnancy nutritional status is positively associated with offspring BMI and adiposity in offspring. And this association is higher among daughters whose mother was overweight or obese and, birth weight explains part of this association.

Sleep parameters measured by accelerometry: descriptive analyses from the 22-year follow-up of the Pelotas 1993 birth cohort.

OBJECTIVE: To describe the sleep time window (STW), total sleep time (TST), and sleep percent [SP = (TST/STW) × 100] by accelerometry in a population-based young adult cohort in Brazil. METHODS: Cross-sectional analysis with a 22-year sample (N = 2462). Sleep variables were measured using an accelerometer. The devices were worn on the non-dominant wrist for approximately seven days. A raw data analysis using the GGIR package was performed. The following sleep variables were extracted: TST, STW, and SP. Linear regression was used to adjust averages. All analyses were stratified according to sex. A comparison between weekday and weekend averages was also conducted. RESULTS: The means of TST, STW, and SP for men were 5.9 h, 7.1 h, and 83.1%, respectively. For women, the means of TST, STW, and SP were 6.4 h, 7.6 h, and 84.6%, respectively. Women presented a higher means of all outcomes compared to men (p < 0.001). After adjusting for both sexes, white skin color and not working or studying were associated with higher TST. Individuals not working or studying presented higher means of STW and lower sleep SP. Women with children who were less than two years of age presented lower values of three evaluated outcomes. Regarding behavior and health condition variables, obesity was associated with lower STW only for men. Physical activity was associated with higher SP and risk drinking with lower TST and STW only for women. CONCLUSION: Differences between sexes were observed in TST, STW, and SP. In all outcomes women presented a higher means. Socioeconomic variables were associated with both sexes, but having children and behavior/health conditions differed between sexes.

Association of modifiable risk factors and IL-6, CRP, and adiponectin: Findings from the 1993 Birth Cohort, Southern Brazil.

BACKGROUND: The literature on the relationship between lifestyle behaviors and inflammatory markers is scarce. METHODS: A birth cohort was followed since birth up to 22 years in Southern Brazil. Interleukin-6 (IL-6), C-reactive protein (CRP) and adiponectin were measured in nonfasting blood samples drawn at 18 and 22 years of age. Exposures including smoking, alcohol intake, physical inactivity and obesity, were collected at 15, 18 and 22 years. Cross sectional analyses were based on the number of follow-up visits with these exposures and the association with IL-6, CRP and adiponectin at 22 years old. We also carried out a longitudinal Generalized Least Squares (GLS) random-effects analysis with outcomes at 18 and at 22 years old. All analyses were adjusted for several covariates. RESULTS: The sample comprised 3,479 cohort members at 22 years. The presence of obesity at ≥ 2 follow-ups showed the highest mean values (SE) for IL-6 [2.45 (1.05)] and CRP [3.74 (1.11)] and the lowest mean value for adiponectin [8.60 (0.37)] (adjusted analyses, females) compared with other exposures; the highest mean of IL-6 [1.65 (1.05)] and CRP [1.78 (1.11)] and the lowest mean of adiponectin [9.98 (0.38)] were for the number of follow-ups with ≥2 exposures compared to those with no exposures at any follow-up (adjusted analyses, females). The longitudinal analysis showed an increase in obesity associated with IL-6 and CRP in both sexes and an inverse association with adiponectin in females; smoking (in males) was associated with IL-6 and CRP, harmful alcohol intake was associated with CRP in males, and increased in physical activity was inversely associated with CRP in men. CONCLUSION: We concluded that obesity is the main exposure positively associated with IL-6 and CRP and inversely associated with adiponectin (mainly in females). Smoking is also associated with these markers in the longitudinal analysis (in males).

Sugar consumption and attention-deficit/hyperactivity disorder (ADHD): A birth cohort study.

BACKGROUND: Attention-deficit/hyperactivity disorder (ADHD) is characterized by persistent symptoms of lack of attention, impulsivity and hyperactivity. The association between nutritional exposures and ADHD has been investigated and some studies have identified adverse effects from higher intake of sugar. The objective of the present study was to evaluate the association between change in sugar consumption between 6 and 11 years of age and incidence of attention-deficit/hyperactivity disorder (ADHD). METHODS: Pelotas 2004 Birth Cohort Study in Brazil. A food frequency questionnaire (FFQ) was used to estimate sugar consumption and the Development and Well-Being Assessment (DAWBA) was applied to mothers to assess the presence of ADHD. RESULTS: Only children without ADHD at 6 years and with complete information from FFQ and DAWBA at 6 and 11 years were included in the analyses (n = 2924). Odds ratios with 95% confidence intervals were calculated. Incidence of ADHD between 6 and 11 years was 4.6% (3.6-5.6%) among boys and 1.8% (1.2-2.5%) among girls. Adjusted analyses showed no association between always high sucrose consumption between 6 and 11 years and incidence of ADHD, compared with individuals who always presented low consumption, both among boys (OR = 0.66; 0.21-2.04) and girls (OR = 2.71; 0.24-30.35). LIMITATIONS: Reflect those that are inherent to use of FFQs, such as memory bias and lack of precision in quantifying the diet. CONCLUSIONS: The results suggest that there is no association between sucrose consumption between 6 and 11 years of age and incidence of ADHD.

The dietary inflammatory index and insulin resistance or metabolic syndrome in young adults.

OBJECTIVE: The aim of this study was to assess the association between the inflammatory potential of diet, as measured by the dietary inflammatory index (DII) and insulin resistance (IR) or metabolic syndrome (MetS). METHODS: A cross-sectional study (nested within a cohort) was conducted on 2017 adults 23 to 25 y of age in Ribeirão Preto, Brazil. Food consumption was assessed using a validated food frequency questionnaire. DII scores were calculated from 35 available food parameters. IR was determined from the classification of homeostatic model assessment (HOMA) values (≥2.7 uU mL-1). MetS was diagnosed based on the Joint Interim Statement (JIS) criterion. The association of DII score with IR or MetS was determined by Poisson regression analysis. The variables included in the multivariable model were selected from directed acyclic graphs. RESULTS: The diet of the young adults studied showed a high inflammatory potential, with a mean DII score of +1.10 (range: -4.69 to +5.28). The prevalence of MetS was 12.2% and IR 12.3%; both were higher in men than in women. The correlation between DII and HOMA-IR values was -0.038 (P = 0.09). The DII was not associated with IR or MetS in either sex. CONCLUSION: Although the association between DII and the outcomes was not detected in this sample, the study demonstrated that the diets of these young adult Brazilians had a high inflammatory potential when compared with other studies. Future studies, preferably using longitudinal designs, are recommended.

Are cytokines (IL-6, CRP and adiponectin) associated with bone mineral density in a young adult birth cohort?

BACKGROUND: Studies have shown that cytokines play a role in bone remodeling. METHODS: In 1993, all hospital births occurred in Pelotas (Brazil) were identified and a total of 5249 newborns were included in the present cohort. Sub-samples of this cohort were visited during childhood and all members were traced at 11, 15, 18 and 22 years old. At 18 and 22 years the following biomarkers were measured: IL-6, CRP and adiponectin (the last one in a sub-sample) and bone mineral density (BMD-mg/cm2) was evaluated at 22 years. Crude regression analysis as well as adjusted for confounders (birth weight, pregnancy maternal smoking, gestational age, skin color, schooling, income, smoking, alcohol, physical activity, medical diagnosis of asthma, diabetes and hypertension, BMI, height, calcium intake, corticosteroid use, age at menarche, insulin and testosterone) were performed between the three biomarkers and the whole-body, lumbar spine and femoral BMD. RESULTS: No statistical significant association was found between IL-6 and CRP with BMD, in males. Significant inverse association in the adjusted analysis, among females, was found for the highest tertiles of CRP at 22 y (beta - 15.2 mg/cm2; 95% CI: -25.4; - 4.9; p = 004), of CRP and IL-6 at 22 years (beta - 20.0 mg/cm2; 95% CI: -31.7; - 8.3; p = 0.003), and of IL-6 and CRP at both ages (beta - 20.3 mg/cm2; 95% CI: -38.0; - 2.5; p = 0.001) with total body BMD. Significant association, among males, was also found between the highest tertile of adiponectin at 22 y (beta - 23.3 mg/cm2; 95% CI: -35.5; - 11.1; p = < 001; beta - 22.5 mg/cm2; 95% CI: -42.9; - 2.2; p = 0.03; and beta - 31.8 mg/cm2; 95% CI: -55.5; - 9.1; p = 0.006) and total body, lumbar spine and femur neck BMD, respectively; and, among females, - 17.8 mg/cm2; 95% CI: -34.9; - 0.9; p = 0.033, with lumbar spine BMD. CONCLUSION: CRP at 22 years, in females, seems to be a marker for total body BMD; adiponectin at 22 years is also a marker for BMD at the three sites, in males, and for lumbar spine BMD, in females.

Association between interleukin-6, C-reactive protein and adiponectin with adiposity: Findings from the 1993 pelotas (Brazil) birth cohort at 18 and 22 years.

BACKGROUND: Most of the literature has shown a direct association between adiposity, interleukin-6 (IL-6) and C-reactive protein (CRP), and an inverse association with adiponectin. The aim of this paper was to assess the association of obesity measurements and IL-6, CRP and adiponectin. METHODS: We performed cross-sectional/longitudinal analysis in the 1993 Birth Cohort in Brazil. Associations between IL-6 (pg/mL), CRP (mg/L) and adiponectin (µg/Ml) with body mass index (BMI), waist circumference (WC), percentage total fat mass (FM) (BODPOD) and trunk FM (DXA) were verified. Four trajectory variables were generated: (a) highest tertile/obesity according to BMI in both follow-ups; (b) highest tertile/obesity only at 18 years; (c) highest tertile/obesity only at 22 years; (d) not in the highest tertile/not obese at both ages. RESULTS: We found a direct association for IL-6 and CRP and an inverse association for adiponectin with measures of adiposity. For instance, for females, the highest mean IL-6 and CRP, respectively, was for those who had been in the obese category at 18-22 years (2.49; 3.75), in the highest tertile of WC (2.11; 3.08), in the highest % of FM (1.56; 3.30 l), and in the highest tertile of trunk FM (2.07; 3.26) (p < 0.001 for all these results in the adjusted analysis). Adiponectin showed an inverse association for the above variables, with lower mean values for males than females. CONCLUSION: There was a longitudinal and direct association between adiposity and IL-6 and CRP, and an inverse association with adiponectin at 22 years.

Adiposity during adolescence and carotid intima-media thickness in adulthood: Results from the 1993 Pelotas Birth Cohort.

BACKGROUND AND AIMS: Although several studies have examined the association between adiposity and cardiovascular risk markers, few have explored the issue prospectively in young populations. We sought to test whether higher levels of body mass index (BMI) and subscapular skinfold at different stages of adolescence were associated with carotid intima-media thickness (cIMT) in young adulthood. METHODS: In a prospective cohort, we assessed BMI and subscapular skinfold at 11, 15 and 18 years and measured cIMT at 18 years in 3264 individuals. Traditional cardiovascular risk factors and fat mass-mediating effects on cIMT were also assessed. RESULTS: Both BMI and subscapular skinfolds were significantly associated with higher cIMT in a cummulative fashion: after controlling for confounders, males and females who persisted overweight/obese at all three assessments, had a mean higher cIMT (5.2 and 3.1 µm, respectively) compared to males and females with normal/healthy BMI at each evaluation (p < 0.001). Moreover, male and females that presented increased fatness in all assessments had a similar pattern of higher cIMT compared to normal/healthy fatness/skinfold at 18 years (mean cIMT 4.6 and 3.0 µm for males and females, respectively; p < 0.001). Associations between adiposity and cIMT were both direct and indirect. Indirect effects were chiefly mediated by fat mass and diastolic blood pressure. CONCLUSIONS: Our results suggest adiposity exerts direct and indirect effects during adolescence that result in higher cIMT in young adulthood.

Relationship between Body Composition and Pulmonary Function in Early Adult Life: A Cross-Sectional Analysis Nested in Two Birth Cohort Studies.

BACKGROUND: Overweight/obesity has been reported to worsen pulmonary function (PF). This study aimed to examine the association between PF and several body composition (BC) measures in two population-based cohorts. METHODS: We performed a cross-sectional analysis of individuals aged 18 and 30 years from two Pelotas Birth Cohorts in southern Brazil. PF was assessed by spirometry. Body measures that were collected included body mass index, waist circumference, skinfold thickness, percentages of total and segmented (trunk, arms and legs) fat mass (FM) and total fat-free mass (FFM). FM and FFM were measured by air-displacement plethysmography (BODPOD) and by dual-energy x-ray absorptiometry (DXA). Associations were verified through linear regressions stratified by sex, and adjusted for weight, height, skin color, and socioeconomic, behavioral, and perinatal variables. RESULTS: A total of 7347 individuals were included in the analyses (3438 and 3909 at 30 and 18 years, respectively). Most BC measures showed a significant positive association between PF and FFM, and a negative association with FM. For each additional percentage point of FM, measured by BOD POD, the forced vital capacity regression coefficient adjusted by height, weight and skin color, at 18 years, was -33 mL (95% CI -38, -29) and -26 mL (95% CI -30, -22), and -30 mL (95% CI -35, -25) and -19 mL (95% CI -23, -14) at 30 years, in men and women, respectively. All the BOD POD regression coefficients for FFM were the same as for the FM coefficients, but in a positive trend (p<0.001 for all associations). CONCLUSIONS: All measures that distinguish FM from FFM (skinfold thickness-FM estimation-BOD POD, total and segmental DXA measures-FM and FFM proportions) showed negative trends in the association of FM with PF for both ages and sexes. On the other hand, FFM showed a positive association with PF.

Distribution of Glycated Haemoglobin According to Early-Life and Contemporary Characteristics in Adolescents and Adults without Diabetes: The 1982 and 1993 Pelotas Birth Cohorts.

AIM: Glycated haemoglobin (HbA1c), a marker of glucose control in individuals with diabetes mellitus, is also related with the incidence of cardiometabolic risk in populations free of disease. The aim of this study was to describe the distribution of HbA1c levels according to early-life and contemporary factors in adolescents and adults without diabetes mellitus. METHODS: HbA1c was measured in adults aged 30 years and adolescents aged 18 years who are participants in the 1982 and 1993 Pelotas Birth Cohorts, respectively. Bivariate and multivariate analyses were performed to describe the HbA1c mean values according to early-life and contemporary characteristics collected prospectively since birth. RESULTS: The distribution of the HbA1c was approximately normal in both cohorts, with a mean (SD) 5.10% (0.43) in the 1982 cohort, and 4.89% (0.50) in the 1993 cohort. HbA1c mean levels were significantly higher in individuals self-reported as black/brown skin color compared to those self-reported as white in both cohorts. Parental history of diabetes was associated with higher HbA1c mean in adults, while stunting at one year old presented an inverse relation with the outcome in adolescents. No other early and contemporary factors were associated with HbA1c levels in adults or adolescents. CONCLUSIONS: We found a consistent relationship between HbA1c and skin color in both cohorts. Further research is needed to understand the role of genomic ancestry on levels of HbA1c concentrations which may inform policies and preventive actions for diabetes mellitus and cardiometabolic risk.

Promotion of Weight Gain in Early Childhood Does Not Increase Metabolic Risk in Adolescents: A 15-Year Follow-Up of a Cluster-Randomized Controlled Trial.

BACKGROUND: A rapid gain in weight for length may put children at a higher risk of noncommunicable diseases later in life. OBJECTIVE: The objective of this study was to assess the long-term effects of nutrition counseling delivered in the first 2 y of life in Pelotas, a city in Southern Brazil. METHODS: The original cluster-randomized controlled trial was conducted in 1998. Nutrition counseling (breastfeeding promotion and increased intake of micronutrient-rich and energy-dense foods) was delivered to mothers of children aged 0-17.9 mo attending primary care. Six months later, weight gain was higher in the intervention group than in the control group for children ≥12 mo of age at enrollment. In 2013 (mean age 15 y), assessments included anthropometric measurements, body composition (air-displacement plethysmography), body shape (3-dimensional photonic scan), and plasma total, LDL, and HDL cholesterol, triglycerides, C-reactive protein, and glucose. RESULTS: A total of 363 of the 424 original participants were assessed. An a priori decision was made to prioritize analyses of subjects aged 12-17.9 mo at enrollment (51 from the intervention group and 45 from the control group). In this subgroup, boys in the intervention group were [mean (95% CI)] 3.4 (0.8, 6.0) cm taller than those in the control group. Systolic blood pressure tended to be 5.2 (-0.8, 11.1) mm Hg higher in male subjects from the intervention group than in those in the control group. Lipid profiles tended to be healthier in the intervention group. The plasma total cholesterol concentration was -17.8 (-29.8, -5.7) mg/dL lower in boys in the intervention group than in those in the control group. The total-to-HDL cholesterol ratio and triglyceride concentration in the girls in the intervention group were -0.4 (-0.6, -0.1) and -26.3 (-46.3, -6.3) mg/dL, respectively, lower than in the control group. There was no difference between the groups in terms of body composition. CONCLUSIONS: Promotion of weight gain in children between 12.0-17.9 mo of age was not associated with higher metabolic risk 15 y later. On the contrary, there was some evidence of reduced metabolic risk in the intervention group.

Childhood behaviour problems predict crime and violence in late adolescence: Brazilian and British birth cohort studies.

PURPOSE: Most children live in low- and middle-income countries (LMICs), many of which have high levels of violence. Research in high-income countries (HICs) shows that childhood behaviour problems are important precursors of crime and violence. Evidence is lacking on whether this is also true in LMICs. This study examines prevalence rates and associations between conduct problems and hyperactivity and crime and violence in Brazil and Britain. METHODS: A comparison was made of birth cohorts in Brazil and Britain, including measures of behaviour problems based on parental report at age 11, and self-reports of crime at age 18 (N = 3,618 Brazil; N = 4,103 Britain). Confounders were measured in the perinatal period and at age 11 in questionnaires completed by the mother and, in Brazil, searches of police records regarding parental crime. RESULTS: Conduct problems, hyperactivity and violent crime were more prevalent in Brazil than in Britain, but nonviolent crime was more prevalent in Britain. Sex differences in prevalence rates were larger where behaviours were less common: larger for conduct problems, hyperactivity, and violent crime in Britain, and larger for nonviolent crime in Brazil. Conduct problems and hyperactivity predicted nonviolent and violent crime similarly in both countries; the effects were partly explained by perinatal health factors and childhood family environments. CONCLUSIONS: Conduct problems and hyperactivity are similar precursors of crime and violence across different social settings. Early crime and violence prevention programmes could target these behavioural difficulties and associated risks in LMICs as well as in HICs.

Happiness and depression in adolescence after maternal smoking during pregnancy: birth cohort study.

BACKGROUND: Prenatal cigarette smoke exposure may have adverse psychological effects on offspring. The objective was to assess the association between parental smoking during pregnancy and offspring happiness at age 18, as well as depression. METHODOLOGY: Participants were part of a birth cohort study in Pelotas, Brazil (5,249 participants). Happiness was measured by the Subjective Happiness Scale, a Likert-like scale with four questions generating a score from 1 to 7, with ≥ 6 indicating "happiness". Depression was measured using the Mini International Psychiatric Interview. RESULTS: About one third of mothers reported having smoked during pregnancy and 4.6% reported smoking 20 or more cigarettes a day. The prevalence of happiness was 32.2% (95% CI 30.8; 33.7), depression 6.8% (95% CI 6.1; 7.6), and simultaneous happiness and depression less than 1%. The prevalence of offspring happiness decreased as smoking in pregnancy increased, even after control for confounding variables, showing an OR = 0.79 [95% CI 0.55; 1.13]. The opposite happened to depression; the prevalence of offspring depression increased as smoking in pregnancy increased (<20 cigarettes/day OR = 1.38 [95% CI 1.03; 1.84] and ≥ 20 cigarettes/day OR = 2.11[95% CI 1.31; 3.40]. Smoking by the partner was associated with decreased offspring happiness after adjustment for confounders, but did no show association with offspring depression. CONCLUSIONS: Offspring were less likely to be happy and more likely to be depressed if their mother smoked during pregnancy, and less likely to be happy if their father smoked during mother's pregnancy. Although we can not affirm that this is a "causal pathway", public policies to reduce smoking in pregnancy could improve the health of the offspring in the short and long term.

[Methodological description of accelerometry for measuring physical activity in the 1993 and 2004 Pelotas (Brazil) birth cohorts]. / Descrição metodológica do uso de acelerometria para mensurar a prática de atividade física nas coortes de nascimentos de Pelotas, Rio Grande do Sul, Brasil, 1993 e 2004.

The aim of this study was to characterize the methodology of data collection on physical activity using accelerometry in two birth cohorts (2004 and 1993) in Pelotas, Rio Grande do Sul State, Brazil, at the 6-7 and 18-year follow-up visits, respectively. During visits to the study headquarters for a health evaluation, cohort subjects received the accelerometer to be worn on the wrist for 5 to 8 days, after which the device was retrieved at their homes. Genea and GENEActiv triaxial estimators of gravity (g) acceleration were employed. Accelerometry data were collected from 3,331 children (93.7% of those included in follow-up) and 3,816 adolescents (99% of those in follow-up). The study characterizes the data collection methodology in more than 7,000 individuals and discusses issues in its implementation. It thus provides a methodological framework aimed at helping to plan future population-based studies with the use of such technology and to improve understanding of physical activity in the context of epidemiological studies.

Descrição metodológica do uso de acelerometria para mensurar a prática de atividade física nas coortes de nascimentos de Pelotas, Rio Grande do Sul, Brasil, 1993 e 2004 / Methodological description of accelerometry for measuring physical activity in the 1993 and 2004 Pelotas (Brazil) birth cohorts / Descripción metodológica del uso de acelerómetros para medir la actividad física en las cohortes de nacimiento de Pelotas, Rio Grande do Sul, Brasil, 1993 y 2004

O objetivo deste trabalho é caracterizar a metodologia de coleta de atividade física por meio de acelerometria nas coortes de nascidos em 2004 e 1993 em Pelotas, Rio Grande do Sul, Brasil, nos acompanhamentos dos 6-7 e 18 anos, respectivamente. Ao visitarem a sede para um amplo estudo de saúde, esses indivíduos receberam o acelerômetro e a posterior busca foi realizada no domicílio por meio de motociclistas da equipe de pesquisa. Os modelos utilizados foram o GENEA e GENEActiv, estimadores triaxiais da aceleração da gravidade (g), utilizados no punho de crianças e adolescentes por um período de 5 a 8 dias. O número de indivíduos com dados de acelerometria nas coortes foi de 3.331 crianças (93,7% do acompanhamento) e 3.816 jovens (92,9% do acompanhamento). Ao caracterizarmos a coleta de acelerometria em mais de 7.000 indivíduos, apresenta-se um arcabouço metodológico para o planejamento de novos estudos populacionais no tema, descrevendo situações específicas dessa experiência e qualificando a compreensão da atividade física no contexto de estudos epidemiológicos.

The aim of this study was to characterize the methodology of data collection on physical activity using accelerometry in two birth cohorts (2004 and 1993) in Pelotas, Rio Grande do Sul State, Brazil, at the 6-7 and 18-year follow-up visits, respectively. During visits to the study headquarters for a health evaluation, cohort subjects received the accelerometer to be worn on the wrist for 5 to 8 days, after which the device was retrieved at their homes. Genea and GENEActiv triaxial estimators of gravity (g) acceleration were employed. Accelerometry data were collected from 3,331 children (93.7% of those included in follow-up) and 3,816 adolescents (99% of those in follow-up). The study characterizes the data collection methodology in more than 7,000 individuals and discusses issues in its implementation. It thus provides a methodological framework aimed at helping to plan future population-based studies with the use of such technology and to improve understanding of physical activity in the context of epidemiological studies.

El objetivo de este estudio es caracterizar la metodología de recolección de la actividad física por acelerometría en las cohortes de nacidos en 2004 y 1993 en Pelotas, Río Grande do Sul, Brasil, en un seguimiento de 6-7 y 18, respectivamente. Al visitar la sede de un centro de salud general, estos sujetos recibieron el acelerómetro y la posterior encuesta en el domicilio se llevó a cabo por los responsables del equipo de investigación. Los modelos utilizados fueron el Genea y GENEActiv, estimadores triaxiales de la aceleración de la gravedad (g), que se utilizaron en niños y adolescentes durante un período de 5 a 8 días. El número de individuos con datos de acelerometría en las cohortes fue de 3.331 niños (93,7% de seguimiento) y 3.816 jóvenes (92,9% de seguimiento). Con el fin de caracterizar la recolección de acelerometría en más de 7.000 individuos, se presenta un marco metodológico para el diseño de nuevos estudios de población sobre el tema, describiendo situaciones específicas de la experiencia y calificando la comprensión de la actividad física en el contexto de los estudios epidemiológicos.

Adequação do consumo energético e de macronutrientes de crianças menores de seis anos / Adequacy of energy consumption and macronutrients of children under six years of age / Adecuación del consumo energético y de macronutrientes de niños con menos de seis años en una ciudad en el sur de Brasil

OBJETIVO: Conhecer a adequação do consumo energético e de macronutrientes da alimentação de crianças menores de seis anos de idade da zona urbana de Pelotas, Rio Grande do Sul. MÉTODOS: Recorte de um estudo transversal que compõe a quarta avaliação de uma pesquisa de série temporal realizada na cidade de Pelotas, Rio Grande do Sul, em 2008. A amostra foi constituída por 799 crianças menores de seis anos de idade. Para avaliação da ingestão calórica e da contribuição percentual de macronutrientes no total de calorias da dieta, foram utilizadas as ingestões dietéticas de referência do Instituto de Medicina. As análises incluíram a descrição da amostra e o teste do qui-quadrado para avaliação das associações, considerando-se um nível de significância de 5%. RESULTADOS: A ingestão calórica deficiente foi maior nos meninos (58,0%) e meninas (63,0%) com idade igual ou menor do que seis meses. Foi observada ingestão calórica excessiva nas idades entre 7 e 12 meses e um e dois anos: 61,3 e 73,5% nos meninos e 56,0 e 74,1% nas meninas, respectivamente. A maioria das crianças com três anos de idade ou mais (meninos com 44,9% e meninas com 47,4%) apresentou ingestão calórica adequada para a idade. A ingestão energética de macronutrientes apresentou-se adequada para carboidratos e proteínas e apontou que 54,5% das crianças tinham ingestão deficiente de lipídeos na faixa etária de um a três anos. CONCLUSÕES: Foi evidenciada a necessidade do estímulo de hábitos alimentares saudáveis que equilibrem a ingestão energética e distribuam o consumo de macronutrientes nesse grupo etário.

OBJECTIVE: To recognize the adequacy of dietary energy consumption and macronutrients of children under the age of six in the urban zone of Pelotas, in Southern Brazil. METHODS: A cross-sectional study that comprises the fourth evaluation of a temporal series study conducted in the city of Pelotas, Rio Grande do Sul, Brazil, in 2008. The sample consisted of 799 children under six years of age. In order to evaluate caloric intake rates and macronutrient percentage of contribution to the overall food diet calories, the dietary reference intakes (DRI) of the Institute of Medicine were used. These analyses included descriptions of the sample and chi-square test in order to assess associations at a 5% significance level. RESULTS: The deficient caloric intake was prevalent among male (58.0%) and female (63.0%) children aged six months or less. An excessive caloric intake was noted in children aged 7 to 12 months and one to two years: 61.3 and 73.5% for boys, and 56.0 and 74.1% for girls, respectively. Among the children aged three years or more, 44.9% of boys and of 47.4% of girls presented proper caloric intake rates for their age group. The energy intake deriving from macronutrients was adequate regarding carbohydrates and proteins; and 54.5% of the studied children aged between one and three years presented deficient intake of lipids. CONCLUSIONS: The need of healthy dieting practices stimulation was clear in order to balance the energetic intake rates and the distribution of macronutrients consumption within this target age group.

OBJETIVO: Conocer la adecuación del consumo energético y de macronutrientes de la alimentación de niños menores de seis años de edad del área urbana de Pelotas, Rio Grande do Sul. MÉTODOS: Recorte de un estudio transversal que compone la cuarta evaluación de una investigación de serie atemporal realizada en la ciudad de Pelotas, Rio Grande do Sul, en 2008. La muestra se constituyó por 799 niños con menos de seis años de edad. Para evaluar la ingestión calórica y el aporte porcentual de macronutrientes en el total de calorías de la dieta, se utilizaron las Ingestiones Dietéticas de Referencia del Instituto de Medicina. Los análisis incluyeron la descripción de la muestra y prueba de chi cuadrado para evaluación de las asociaciones, considerándose un nivel de significancia de 5%. RESULTADOS: La ingestión calórica deficiente fue más grande en los muchachos (58,0%) y muchachas (63,0%) con edad igual o inferior a seis meses. Se observó ingestión calórica excesiva en las edades entre 7 y 12 meses y uno y dos años: 61,3 y 73,5% en los muchachos y 56,0 y 74,1% en las muchachas, respectivamente. La mayoría de los niños con tres años de edad o más (44,9% muchachos y 47,4% muchachas) presentó ingestión calórica adecuada para la edad. La ingestión energética de macronutrientes se presentó adecuada para carbohidratos y proteínas y señaló que 54,5% de los niños tenían ingestión deficiente de lípidos en la franja de edad de uno a tres años. CONCLUSIÓNS: Se evidenció la necesidad del estímulo de hábitos alimentares sanos que equilibren la ingestión energética y distribuyan el consumo de macronutrientes en ese grupo de edad.

Predictors of body mass index change from 11 to 15 years of age: the 1993 Pelotas (Brazil) birth cohort study.

PURPOSE: We explored predictors of nutritional status change from 11 to 15 years of age by analyzing prospective data. METHODS: We collected data at 11 and 15 years of age from individuals born in 1993 in Pelotas, Brazil. We assessed nutritional status using body mass index (BMI) for age in z-score according to the World Health Organization 2007 standards. Independent variables collected at 11 years of age were socioeconomic position, adolescent's perception of own weight, body dissatisfaction, and weight loss dieting. RESULTS: Of the 4,032 adolescents whose nutritional status could be evaluated in the two follow-ups, 93% maintained their nutritional status classification from 11 to 15 years. A total of 102 (2.8%) became obese and 181 (4.5%) ceased to be obese in the 4-year period. The prevalence of obesity decreased from 11 to 15 years of age in both boys and girls. Low-income girls were more likely to become obese from 11 to 15 years of age compared with high-income ones. Among boys, those with high income were more likely to cease being obese compared those with low income. Those who perceived themselves to be obese, who wished to have a smaller silhouette, and who were on diets to lose weight were more likely to become obese or to achieve a normal BMI category at 15 years of age. CONCLUSIONS: BMI tracks strongly in early adolescence. This finding suggests that interventions to more effectively change nutritional status should be implemented in childhood and should consider emotional aspects as well as social and biological ones.

Efetividade de uma intervenção educacional em tabagismo entre adolescentes escolares / Effectiveness of an educational intervention on smoking among school adolescents

O objetivo do estudo foi avaliar a efetividade de um programa educacional sobre tabagismo desenvolvido pelo Instituto Nacional do Câncer em adolescentes escolares de Pelotas, RS. Das 46 escolas públicas da cidade, 32 foram sorteadas aleatoriamente e, posteriormente, randomizadas em grupo controle ou intervenção. Em ambas as fases do estudo (pré e pós-intervenção), os estudantes de 7ª e 8ª série responderam a um questionário, e uma amostra de urina foi coletada para análise de cotinina. A intervenção educativa teve duração de seis meses. Os desfechos estudados foram: "auto-relato de uso de cigarros nos últimos 30 dias" e "concentração de cotinina na urina (categorizada em > 10 ng/ml e > 30 ng/ml)". A intervenção não provocou mudança na prevalência de tabagismo, tanto mensurado por auto-relato como pela concentração de cotinina. No entanto, o conhecimento dos alunos acerca dos malefícios do cigarro aumentou no grupo intervenção. Em resumo, não houve efetividade da intervenção educacional para mudanças de comportamento, mas houve melhora no conhecimento dos prejuízos do fumo.

Randomized, controlled trial promotes physical activity and reduces consumption of sweets and sodium among overweight and obese adults.

The present study sought to assess the impact of an intervention to reduce weight and control risk factors of noncommunicable chronic diseases in overweight or obese adults who are users of primary and secondary healthcare units of the public health system of Pelotas, Brazil. We hypothesized that individuals who received an educational intervention regarding how to lose weight and prevent other noncommunicable chronic disease risk factors through nutrition would lose weight and acquire active habits during leisure time more frequently than individuals under regular care. Two hundred forty-one participants from the Nutrition Outpatient Clinic of the Medical Teaching Hospital of the Federal University of Pelotas, Brazil, aged 20 years or older and classified as overweight or obese were randomly allocated to either the intervention group (IG; n = 120) or control group (CG; n = 121). The IG received individualized nutritional care for 6 months, and the CG received individualized usual care of the health services. Intention-to-treat analyses showed that at 6 months, mean fasting glycemia and daily consumption of sweet foods and sodium were reduced, and the time spent on physical leisure activity was increased in IG. Analysis of adherence to the protocol of the study revealed that individuals from IG had lost more in body weight, waist circumference, and fasting glucose compared to the CG. Leisure time physical activity increased in IG. Individuals adhered equally to the dietetic recommendations, irrespective of the nutrition approach that was used.