RESUMEN

BACKGROUND: Cardiovascular risk factors are increasing in most developing countries. To date, however, very little standardized data has been collected on the primary risk factors across the spectrum of economic development. Data are particularly sparse from Africa. METHODS: In the Modeling the Epidemiologic Transition Study (METS) we examined population-based samples of men and women, ages 25-45 of African ancestry in metropolitan Chicago, Kingston, Jamaica, rural Ghana, Cape Town, South Africa, and the Seychelles. Key measures of cardiovascular disease risk are described. RESULTS: The risk factor profile varied widely in both total summary estimates of cardiovascular risk and in the magnitude of component factors. Hypertension ranged from 7% in women from Ghana to 35% in US men. Total cholesterol was well under 200 mg/dl for all groups, with a mean of 155 mg/dl among men in Ghana, South Africa and Jamaica. Among women total cholesterol values varied relatively little by country, following between 160 and 178 mg/dl for all 5 groups. Levels of HDL-C were virtually identical in men and women from all study sites. Obesity ranged from 64% among women in the US to 2% among Ghanaian men, with a roughly corresponding trend in diabetes. Based on the Framingham risk score a clear trend toward higher total risk in association with socioeconomic development was observed among men, while among women there was considerable overlap, with the US participants having only a modestly higher risk score. CONCLUSIONS: These data provide a comprehensive estimate of cardiovascular risk across a range of countries at differing stages of social and economic development and demonstrate the heterogeneity in the character and degree of emerging cardiovascular risk. Severe hypercholesterolemia, as characteristic in the US and much of Western Europe at the onset of the coronary epidemic, is unlikely to be a feature of the cardiovascular risk profile in these countries in the foreseeable future, suggesting that stroke may remain the dominant cardiovascular event.

Asunto(s)

Población Negra/estadística & datos numéricos , Enfermedades Cardiovasculares/epidemiología , Países en Desarrollo/estadística & datos numéricos , Desarrollo Económico/estadística & datos numéricos , Adulto , Chicago/epidemiología , Estudios Epidemiológicos , Europa (Continente) , Femenino , Ghana/epidemiología , Humanos , Jamaica/epidemiología , Masculino , Persona de Mediana Edad , Prevalencia , Factores de Riesgo , Seychelles/epidemiología , Factores Socioeconómicos , Sudáfrica/epidemiología

RESUMEN

BACKGROUND: Variations in physical activity (PA) across nations may be driven by socioeconomic position. As national incomes increase, car ownership becomes within reach of more individuals. This report characterizes associations between car ownership and PA in African-origin populations across 5 sites at different levels of economic development and with different transportation infrastructures: US, Seychelles, Jamaica, South Africa, and Ghana. METHODS: Twenty-five hundred adults, ages 25-45, were enrolled in the study. A total of 2,101 subjects had valid accelerometer-based PA measures (reported as average daily duration of moderate to vigorous PA, MVPA) and complete socioeconomic information. Our primary exposure of interest was whether the household owned a car. We adjusted for socioeconomic position using household income and ownership of common goods. RESULTS: Overall, PA levels did not vary largely between sites, with highest levels in South Africa, lowest in the US. Across all sites, greater PA was consistently associated with male gender, fewer years of education, manual occupations, lower income, and owning fewer material goods. We found heterogeneity across sites in car ownership: after adjustment for confounders, car owners in the US had 24.3 fewer minutes of MVPA compared to non-car owners in the US (20.7 vs. 45.1 minutes/day of MVPA); in the non-US sites, car-owners had an average of 9.7 fewer minutes of MVPA than non-car owners (24.9 vs. 34.6 minutes/day of MVPA). CONCLUSIONS: PA levels are similar across all study sites except Jamaica, despite very different levels of socioeconomic development. Not owning a car in the US is associated with especially high levels of MVPA. As car ownership becomes prevalent in the developing world, strategies to promote alternative forms of active transit may become important.

Asunto(s)

Automóviles/estadística & datos numéricos , Población Negra/estadística & datos numéricos , Ejercicio Físico , Renta , Propiedad , Adulto , Estudios Epidemiológicos , Femenino , Ghana , Humanos , Jamaica , Masculino , Persona de Mediana Edad , Prevalencia , Seychelles , Factores Socioeconómicos , Sudáfrica

RESUMEN

Studies on the role of diet in the development of chronic diseases often rely on self-report surveys of dietary intake. Unfortunately, many validity studies have demonstrated that self-reported dietary intake is subject to systematic under-reporting, although the vast majority of such studies have been conducted in industrialised countries. The aim of the present study was to investigate whether or not systematic reporting error exists among the individuals of African ancestry (n 324) in five countries distributed across the Human Development Index (HDI) scale, a UN statistic devised to rank countries on non-income factors plus economic indicators. Using two 24 h dietary recalls to assess energy intake and the doubly labelled water method to assess total energy expenditure, we calculated the difference between these two values ((self-report - expenditure/expenditure) × 100) to identify under-reporting of habitual energy intake in selected communities in Ghana, South Africa, Seychelles, Jamaica and the USA. Under-reporting of habitual energy intake was observed in all the five countries. The South African cohort exhibited the highest mean under-reporting ( - 52·1% of energy) compared with the cohorts of Ghana ( - 22·5%), Jamaica ( - 17·9%), Seychelles ( - 25·0%) and the USA ( - 18·5%). BMI was the most consistent predictor of under-reporting compared with other predictors. In conclusion, there is substantial under-reporting of dietary energy intake in populations across the whole range of the HDI, and this systematic reporting error increases according to the BMI of an individual.

Asunto(s)

Registros de Dieta , Dieta , Ingestión de Energía , Adulto , Índice de Masa Corporal , Enfermedad Crónica , Deuterio , Metabolismo Energético , Reacciones Falso Negativas , Femenino , Ghana , Humanos , Jamaica , Masculino , Recuerdo Mental , Persona de Mediana Edad , Evaluación Nutricional , Hipernutrición/diagnóstico , Isótopos de Oxígeno , Población Rural , Seychelles , Sudáfrica , Encuestas y Cuestionarios , Estados Unidos , Población Urbana , Agua

RESUMEN

OBJECTIVES: Blood pressures in persons of African descent exceed those of other racial/ethnic groups in the United States. Whether this trait is attributable to the genetic factors in African-origin populations, or a result of inadequately measured environmental exposures, such as racial discrimination, is not known. To study this question, we conducted a multisite comparative study of communities in the African diaspora, drawn from metropolitan Chicago, Kingston, Jamaica, rural Ghana, Cape Town, South Africa, and the Seychelles. METHODS: At each site, 500 participants between the age of 25 and 49 years, with approximately equal sex balance, were enrolled for a longitudinal study of energy expenditure and weight gain. In this study, we describe the patterns of blood pressure and hypertension observed at baseline among the sites. RESULTS: Mean SBP and DBP were very similar in the United States and South Africa in both men and women, although among women, the prevalence of hypertension was higher in the United States (24 vs. 17%, respectively). After adjustment for multiple covariates, relative to participants in the United States, SBP was significantly higher among the South Africans by 9.7 mmHg (P < 0.05) and significantly lower for each of the other sites: for example, Jamaica: -7.9 mmHg (P = 0.06), Ghana: -12.8 mmHg (P < 0.01) and Seychelles: -11.1 mmHg (P = 0.01). CONCLUSION: These data are consistent with prior findings of a blood pressure gradient in societies of the African diaspora and confirm that African-origin populations with lower social status in multiracial societies, such as the United States and South Africa, experience more hypertension than anticipated based on anthropometric and measurable socioeconomic risk factors.

Asunto(s)

Población Negra/estadística & datos numéricos , Presión Sanguínea , Hipertensión/etnología , Adulto , Tamaño Corporal , Metabolismo Energético , Estudios Epidemiológicos , Femenino , Ghana/epidemiología , Humanos , Jamaica/epidemiología , Estudios Longitudinales , Masculino , Persona de Mediana Edad , Prevalencia , Factores de Riesgo , Población Rural , Seychelles/epidemiología , Factores Socioeconómicos , Sudáfrica/epidemiología , Estados Unidos/epidemiología

RESUMEN

BACKGROUND: Metals are known endocrine disruptors and have been linked to cardiometabolic diseases via multiple potential mechanisms, yet few human studies have both the exposure variability and biologically-relevant phenotype data available. We sought to examine the distribution of metals exposure and potential associations with cardiometabolic risk factors in the "Modeling the Epidemiologic Transition Study" (METS), a prospective cohort study designed to assess energy balance and change in body weight, diabetes and cardiovascular disease risk in five countries at different stages of social and economic development. METHODS: Young adults (25-45 years) of African descent were enrolled (N = 500 from each site) in: Ghana, South Africa, Seychelles, Jamaica and the U.S.A. We randomly selected 150 blood samples (N = 30 from each site) to determine concentrations of selected metals (arsenic, cadmium, lead, mercury) in a subset of participants at baseline and to examine associations with cardiometabolic risk factors. RESULTS: Median (interquartile range) metal concentrations (µg/L) were: arsenic 8.5 (7.7); cadmium 0.01 (0.8); lead 16.6 (16.1); and mercury 1.5 (5.0). There were significant differences in metals concentrations by: site location, paid employment status, education, marital status, smoking, alcohol use, and fish intake. After adjusting for these covariates plus age and sex, arsenic (OR 4.1, 95% C.I. 1.2, 14.6) and lead (OR 4.0, 95% C.I. 1.6, 9.6) above the median values were significantly associated with elevated fasting glucose. These associations increased when models were further adjusted for percent body fat: arsenic (OR 5.6, 95% C.I. 1.5, 21.2) and lead (OR 5.0, 95% C.I. 2.0, 12.7). Cadmium and mercury were also related with increased odds of elevated fasting glucose, but the associations were not statistically significant. Arsenic was significantly associated with increased odds of low HDL cholesterol both with (OR 8.0, 95% C.I. 1.8, 35.0) and without (OR 5.9, 95% C.I. 1.5, 23.1) adjustment for percent body fat. CONCLUSIONS: While not consistent for all cardiometabolic disease markers, these results are suggestive of potentially important associations between metals exposure and cardiometabolic risk. Future studies will examine these associations in the larger cohort over time.

Asunto(s)

Arsénico/sangre , Peso Corporal/efectos de los fármacos , Enfermedades Cardiovasculares/epidemiología , Diabetes Mellitus/epidemiología , Exposición a Riesgos Ambientales , Contaminantes Ambientales/sangre , Metales Pesados/sangre , Adulto , África/epidemiología , Biomarcadores , Enfermedades Cardiovasculares/inducido químicamente , Chicago/epidemiología , Diabetes Mellitus/inducido químicamente , Femenino , Humanos , Jamaica/epidemiología , Masculino , Persona de Mediana Edad , Estudios Prospectivos , Factores de Riesgo

RESUMEN

BACKGROUND: This difference in how populations living in low-, middle or upper-income countries accumulate daily PA, i.e. patterns and intensity, is an important part in addressing the global PA movement. We sought to characterize objective PA in 2,500 participants spanning the epidemiologic transition. The Modeling the Epidemiologic Transition Study (METS) is a longitudinal study, in 5 countries. METS seeks to define the association between physical activity (PA), obesity and CVD risk in populations of African origin: Ghana (GH), South Africa (SA), Seychelles (SEY), Jamaica (JA) and the US (suburban Chicago). METHODS: Baseline measurements of objective PA, SES, anthropometrics and body composition, were completed on 2,500 men and women, aged 25-45 years. Moderate and vigorous PA (MVPA, min/d) on week and weekend days was explored ecologically, by adiposity status and manual labor. RESULTS: Among the men, obesity prevalence reflected the level of economic transition and was lowest in GH (1.7%) and SA (4.8%) and highest in the US (41%). SA (55%) and US (65%) women had the highest levels of obesity, compared to only 16% in GH. More men and women in developing countries engaged in manual labor and this was reflected by an almost doubling of measured MPVA among the men in GH (45 min/d) and SA (47 min/d) compared to only 28 min/d in the US. Women in GH (25 min/d), SA (21 min/d), JA (20 min/d) and SEY (20 min/d) accumulated significantly more MPVA than women in the US (14 min/d), yet this difference was not reflected by differences in BMI between SA, JA, SEY and US. Moderate PA constituted the bulk of the PA, with no study populations except SA men accumulating > 5 min/d of vigorous PA. Among the women, no sites accumulated >2 min/d of vigorous PA. Overweight/obese men were 22% less likely to engage in manual occupations. CONCLUSION: While there is some association for PA with obesity, this relationship is inconsistent across the epidemiologic transition and suggests that PA policy recommendations should be tailored for each environment.

Asunto(s)

Países Desarrollados , Países en Desarrollo , Ejercicio Físico , Obesidad/prevención & control , Esfuerzo Físico , Trabajo , Adiposidad , Adulto , Índice de Masa Corporal , Chicago/epidemiología , Femenino , Ghana/epidemiología , Humanos , Jamaica/epidemiología , Estudios Longitudinales , Masculino , Persona de Mediana Edad , Actividad Motora , Obesidad/epidemiología , Obesidad/etiología , Ocupaciones , Sobrepeso , Factores Sexuales , Seychelles/epidemiología , Sudáfrica/epidemiología , Factores de Tiempo

RESUMEN

BACKGROUND: Patients with sickle cell disease in the USA have been noted to have lower levels of vitamin D - measured as 25-hydroxyvitamin D (25(OH)D) - compared to controls. Average serum 25(OH)D levels are also substantially lower in African Americans than whites, while population distributions of 25(OH)D among Jamaicans of African descent and West Africans are the same as among USA whites. The purpose of this study was to examine whether adult patients with sickle cell disease living in tropical regions had reduced 25(OH)D relative to the general population. METHODS: We analyzed serum 25(OH)D in stored samples collected from studies in Jamaica and West Africa of adult patients with sickle cell disease and adult population controls. RESULTS: In samples of 20 Jamaicans and 50 West Africans with sickle cell disease mean values of 25(OH)D were 37% and 39% lower than controls, respectively. Metabolic abnormalities in the absorption and conversion pathways are possible causes for the consistent relative deficiency of 25(OH)D in sickle cell disease. CONCLUSIONS: Low 25(OH)D levels in tropical Africa where the burden of sickle cell disease is highest, deserve further investigation, and a randomized trial is warranted to address efficacy of supplementation.

RESUMEN

BACKGROUND: The vitamin D-endocrine system is thought to play a role in physiologic processes that range from mineral metabolism to immune function. Serum 25-hydroxyvitamin D [25(OH)D] is the accepted biomarker for vitamin D status. Skin color is a key determinant of circulating 25(OH)D concentrations, and genes responsible for melanin content have been shown to be under strong evolutionary selection in populations living in temperate zones. Little is known about the effect of latitude on mean concentrations of 25(OH)D in dark-skinned populations. OBJECTIVE: The objective was to describe the distribution of 25(OH)D and its subcomponents in 5 population samples of African origin from the United States, Jamaica, Ghana, South Africa, and the Seychelles. DESIGN: Participants were drawn from the Modeling of the Epidemiologic Transition Study, a cross-sectional observational study in 2500 adults, ages 25-45 y, enrolled between January 2010 and December 2011. Five hundred participants, ∼50% of whom were female, were enrolled in each of 5 study sites: Chicago, IL (latitude: 41°N); Kingston, Jamaica (17°N); Kumasi, Ghana (6°N); Victoria, Seychelles (4°S); and Cape Town, South Africa (34°S). All participants had an ancestry primarily of African origin; participants from the Seychelles trace their history to East Africa. RESULTS: A negative correlation between 25(OH)D and distance from the equator was observed across population samples. The frequency distribution of 25(OH)D in Ghana was almost perfectly normal (Gaussian), with progressively lower means and increasing skewness observed at higher latitudes. CONCLUSIONS: It is widely assumed that lighter skin color in populations outside the tropics resulted from positive selection, driven in part by the relation between sun exposure, skin melanin content, and 25(OH)D production. Our findings show that robust compensatory mechanisms exist that create tolerance for wide variation in circulating concentrations of 25(OH)D across populations, suggesting a more complex evolutionary relation between skin color and the vitamin D pathway.

Asunto(s)

25-Hidroxivitamina D 2/sangre , Calcifediol/sangre , Modelos Biológicos , Pigmentación de la Piel , Piel/efectos de la radiación , Rayos Ultravioleta , Deficiencia de Vitamina D/epidemiología , 25-Hidroxivitamina D 2/metabolismo , Adulto , Biomarcadores/sangre , Población Negra , Calcifediol/análogos & derivados , Calcifediol/metabolismo , Chicago/epidemiología , Estudios Transversales , Femenino , Ghana/epidemiología , Humanos , Jamaica/epidemiología , Masculino , Persona de Mediana Edad , Riesgo , Seychelles/epidemiología , Piel/metabolismo , Sudáfrica/epidemiología , Luz Solar , Deficiencia de Vitamina D/sangre , Deficiencia de Vitamina D/metabolismo

RESUMEN

OBJECTIVE: To evaluate the associations between population-wide loss and gain in weight with diabetes prevalence, incidence, and mortality, as well as cardiovascular and cancer mortality trends, in Cuba over a 30 year interval. DESIGN: Repeated cross sectional surveys and ecological comparison of secular trends. SETTING: Cuba and the province of Cienfuegos, from 1980 to 2010. PARTICIPANTS: Measurements in Cienfuegos included a representative sample of 1657, 1351, 1667, and 1492 adults in 1991, 1995, 2001, and 2010, respectively. National surveys included a representative sample of 14 304, 22 851, and 8031 participants in 1995, 2001, and 2010, respectively. MAIN OUTCOME MEASURES: Changes in smoking, daily energy intake, physical activity, and body weight were tracked from 1980 to 2010 using national and regional surveys. Data for diabetes prevalence and incidence were obtained from national population based registries. Mortality trends were modelled using national vital statistics. RESULTS: Rapid declines in diabetes and heart disease accompanied an average population-wide loss of 5.5 kg in weight, driven by an economic crisis in the mid-1990s. A rebound in population weight followed in 1995 (33.5% prevalence of overweight and obesity) and exceeded pre-crisis levels by 2010 (52.9% prevalence). The population-wide increase in weight was immediately followed by a 116% increase in diabetes prevalence and 140% increase in diabetes incidence. Six years into the weight rebound phase, diabetes mortality increased by 49% (from 9.3 deaths per 10 000 people in 2002 to 13.9 deaths per 10 000 people in 2010). A deceleration in the rate of decline in mortality from coronary heart disease was also observed. CONCLUSIONS: In relation to the Cuban experience in 1980-2010, there is an association at the population level between weight reduction and death from diabetes and cardiovascular disease; the opposite effect on the diabetes and cardiovascular burden was seen on population-wide weight gain.

Asunto(s)

Enfermedades Cardiovasculares/mortalidad , Diabetes Mellitus/mortalidad , Obesidad/epidemiología , Pérdida de Peso , Peso Corporal , Costo de Enfermedad , Estudios Transversales , Cuba/epidemiología , Ingestión de Energía , Femenino , Encuestas Epidemiológicas , Humanos , Incidencia , Masculino , Persona de Mediana Edad , Mortalidad/tendencias , Obesidad/economía , Obesidad/fisiopatología , Prevalencia , Análisis de Regresión , Aumento de Peso

RESUMEN

BACKGROUND: The excess burden of hypertension among blacks has been a prominent feature of the heath disparities literature, and many scientists presume it to be a stable and inevitable phenomenon. The underlying causes of this disparity can only be disentangled in a setting in which the population does not experience racial stratification of socioeconomic opportunities. While such conditions of racial equality remain uncommon, they may be approximated in Cuba, a country with a persistent policy of social inclusion over the last 5 decades. METHODS: We report on a 2010-2011 stratified probability sample of those aged 15-74 years from the urban population of Cienfuegos in central Cuba. A total of 1496 adults (880 women and 616 men) were recruited and assessed for blood pressure and anthropometrics according to standardized protocols, as well as medication use, educational attainment and observed skin tone (dichotomized into "black" and "white"). Weighted tabular and regression analyses were conducted to estimate adjusted prevalences of hypertension (> 140/90 mmHg) and adjusted prevalence odds ratios for contrasts between the two skin color groups. RESULTS: Mean pressures were higher for men than for women, but overall did not differ importantly between racial groups. About half of all diagnosed hypertensive men were on medication, a proportion that did not vary by racial group. For women, however, adjusted prevalence was somewhat higher among blacks, and treatment and control rates were also somewhat advantaged for white women. CONCLUSIONS: Overall, skin color was unrelated to mean blood pressure or hypertensive status in this population, although among women specifically some racial advantage appears evident in adjusted prevalence and control, and should be investigated further. The overall null result suggests that Cuba may exemplify the social conditions in which racial excess in hypertension, characteristic of much of the western world, is not a necessary reality.

Asunto(s)

Población Negra/estadística & datos numéricos , Hipertensión/etnología , Vigilancia de la Población , Población Blanca/estadística & datos numéricos , Adolescente , Adulto , Anciano , Cuba/epidemiología , Femenino , Humanos , Masculino , Persona de Mediana Edad , Prevalencia

RESUMEN

We longitudinally explored the relationship of body size and adiponectin levels in 393 community-dwelling Afro-Jamaicans. Adiponectin levels were greater in women, increased with age and declined with abdominal adiposity. Multivariate regression analyses suggest that subcutaneous fat in women may contribute significantly to the variance in their adiponectin levels.

Asunto(s)

Adiponectina/sangre , Tejido Adiposo/anatomía & histología , Población Negra/estadística & datos numéricos , Distribución de la Grasa Corporal , Adulto , Anciano , Estatura , Peso Corporal , Femenino , Humanos , Resistencia a la Insulina , Jamaica , Estudios Longitudinales , Masculino , Persona de Mediana Edad , Análisis Multivariante , Análisis de Regresión , Caracteres Sexuales , Población Urbana

RESUMEN

Genome-wide association (GWA) studies have identified common variants that are associated with a variety of traits and diseases, but most studies have been performed in European-derived populations. Here, we describe the first genome-wide analyses of imputed genotype and copy number variants (CNVs) for anthropometric measures in African-derived populations: 1188 Nigerians from Igbo-Ora and Ibadan, Nigeria, and 743 African-Americans from Maywood, IL. To improve the reach of our study, we used imputation to estimate genotypes at approximately 2.1 million single-nucleotide polymorphisms (SNPs) and also tested CNVs for association. No SNPs or common CNVs reached a genome-wide significance level for association with height or body mass index (BMI), and the best signals from a meta-analysis of the two cohorts did not replicate in approximately 3700 African-Americans and Jamaicans. However, several loci previously confirmed in European populations showed evidence of replication in our GWA panel of African-derived populations, including variants near IHH and DLEU7 for height and MC4R for BMI. Analysis of global burden of rare CNVs suggested that lean individuals possess greater total burden of CNVs, but this finding was not supported in an independent European population. Our results suggest that there are not multiple loci with strong effects on anthropometric traits in African-derived populations and that sample sizes comparable to those needed in European GWA studies will be required to identify replicable associations. Meta-analysis of this data set with additional studies in African-ancestry populations will be helpful to improve power to detect novel associations.

Asunto(s)

Población Negra/genética , Negro o Afroamericano/genética , Variaciones en el Número de Copia de ADN , Estudio de Asociación del Genoma Completo , Adolescente , Adulto , Anciano , Antropometría , Genotipo , Humanos , Illinois , Jamaica , Persona de Mediana Edad , Modelos Estadísticos , Nigeria , Polimorfismo de Nucleótido Simple , Adulto Joven

RESUMEN

OBJECTIVES: Adiponectin and ghrelin are associated with adiposity and type 2 diabetes in several studies. We sought to prospectively determine the interaction of adiponectin and ghrelin in the development of adiposity and hyperglycaemia. DESIGN: Prospective observational study. PARTICIPANTS: 393 community-dwelling Afro-Jamaicans (mean age 47 +/- 13 years; BMI 27.3 +/- 6.3 kg/m(2); 63% women) without glucose intolerance at baseline. MEASUREMENTS: Anthropometry, fasting plasma glucose, 2-h plasma glucose, insulin resistance (HOMA-IR), adiponectin and ghrelin concentrations were measured at baseline and 4.1 +/- 0.9 years later. Multivariate analyses were used to explore the associations of HOMA-IR, adiponectin and ghrelin with weight change and glycaemia. Results The mean weight change was 2.6 +/- 5.5 kg. There were 114 incident cases of impaired glucose tolerance (IGT) and 35 cases of diabetes mellitus. Adiponectin was positively correlated with age and female sex (P-values < 0.01). After adjusting for age and sex, adiponectin and ghrelin were significantly correlated with weight at baseline and follow-up. However, they were not associated with weight change even after further adjustment for baseline weight. Adiponectin, but not ghrelin, was associated with 2-h glucose concentrations at follow-up even after adjusting for age, sex, HOMA-IR and BMI (P = 0.04). In the fully adjusted logistic regression model, adiponectin predicted incident IGT (OR 0.93; 95% CI: 0.87-0.99) and attenuated the effect of BMI on incident IGT. CONCLUSIONS: These longitudinal data show that adiponectin and ghrelin may not be causally involved in the development of obesity. However, adiponectin is independently associated with decreased risk of incident IGT.

Asunto(s)

Adiponectina/sangre , Adiposidad/fisiología , Ghrelina/sangre , Intolerancia a la Glucosa/fisiopatología , Aumento de Peso/fisiología , Adulto , Anciano , Población Negra/etnología , Glucemia/metabolismo , Femenino , Estudios de Seguimiento , Intolerancia a la Glucosa/etnología , Humanos , Hiperglucemia/fisiopatología , Resistencia a la Insulina/fisiología , Jamaica , Modelos Logísticos , Estudios Longitudinales , Masculino , Persona de Mediana Edad , Estudios Prospectivos

RESUMEN

BACKGROUND: Angiotensin I-converting enzyme (ACE) plays an important role in cardiovascular homeostasis. There is evidence from different ethnic groups that circulating ACE levels are influenced by a quantitative trait locus (QTL) at the ACE gene on chromosome 17. The finding of significant residual familial correlations in different ethnic groups, after accounting for this QTL, and the finding of support for linkage to a locus on chromosome 4 in Mexican-American families strongly suggest that there may well be QTLs for ACE unlinked to the ACE gene. METHODS: A genome-wide panel of microsatellite markers, and a panel of biallelic polymorphisms in the ACE gene were typed in Nigerian families. Single locus models with fixed parameters were used to test for linkage to circulating ACE with and without adjustment for the effects of the ACE gene polymorphisms. RESULTS: Strong evidence was found for D17S2193 (Zmax = 3.5); other nearby markers on chromosome 17 also showed modest support. After adjustment for the effects of the ACE gene locus, evidence of "suggestive linkage" to circulating ACE was found for D4S1629 (Zmax = 2.2); this marker is very close to a locus previously shown to be linked to circulating ACE levels in Mexican-American families. CONCLUSION: In this report we have provided further support for the notion that there are QTLs for ACE unlinked to the ACE gene; our findings for chromosome 4, which appear to replicate the findings of a previous independent study, should be considered strong grounds for a more detailed examination of this region in the search for genes/variants which influence ACE levels.The poor yields, thus far, in defining the genetic determinants of hypertension risk suggest a need to look beyond simple relationships between genotypes and the ultimate phenotype. In addition to incorporating information on important environmental exposures, a better understanding of the factors which influence the building blocks of the blood pressure homeostatic network is also required. Detailed studies of the genetic determinants of ACE, an important component of the renin-angiotensin system, have the potential to contribute to this strategic objective.

Asunto(s)

Enfermedades Cardiovasculares/mortalidad , Diabetes Mellitus/mortalidad , Obesidad/prevención & control , Canadá , Cuba/epidemiología , Dieta , Ingestión de Energía , Humanos , Estilo de Vida , Actividad Motora , Obesidad/epidemiología , Factores Socioeconómicos

RESUMEN

BACKGROUND: Weight gain in adulthood is now common in many populations, ranging from modest gains in developing countries to a substantial percentage of body weight in some Western societies. To examine the rate of change across the spectrum of low to high-income countries we compared rates of weight change in samples drawn from three countries, Nigeria, Jamaica and the United States. METHODS: Population samples from Nigeria (n = 1,242), Jamaica (n = 1,409), and the US (n = 809) were selected during the period 1995-1999 in adults over the age of 19; participation rates in the original survey were 96%, 60%, and 60%, respectively. Weight in (kg) was measured on 3 different occasions, ending in 2005. Multi-level regression models were used to estimate weight change over time and pattern-mixture models were applied to assess the potential effect of missing data on estimates of the model parameters. RESULTS: The unadjusted weight gain rate (standard error) was 0.34(0.06), 1.26(0.12), 0.34(0.19) kg/year among men and 0.43(0.06), 1.28(0.10), 0.40(0.15) kg/year among women in Nigeria, Jamaica, US, respectively. Regression-adjusted weight change rates were significantly different across country, sex, and baseline BMI. Adjusted weight gain in Nigeria, Jamaica and US was 0.31(0.05), 1.37(.04), and 0.52(0.05) kg/year respectively. Women in Nigeria and the US had higher weight gains than men, with the converse observed among Jamaicans. The obese experienced weight loss across all three samples, whereas the normal weight (BMI < 25) had significant weight gains. Missing data patterns had an effect on the rates of weight change. CONCLUSION: Weight change in sample cohorts from a middle-income country was greater than in cohorts from either of the low- or high-income countries. The steep trajectory of weight gain in Jamaica, relative to Nigeria and the US, is most likely attributable to the accelerating effects of the cultural and behavioral shifts which have come to bear on transitional societies.

Asunto(s)

Obesidad/epidemiología , Aumento de Peso , Adulto , Anciano , Análisis de Varianza , Femenino , Humanos , Jamaica/epidemiología , Modelos Logísticos , Masculino , Persona de Mediana Edad , Modelos Estadísticos , Nigeria/epidemiología , Prevalencia , Análisis de Regresión , Estados Unidos/epidemiología

RESUMEN

OBJECTIVES: Identifying methods to improve pharmacologic control of elevated blood pressure remains the most urgent challenge in clinical research on hypertension. The probability of having inadequate control varies widely in the population and better understanding of the factors responsible could help to focus treatment strategies. METHODS: A population-based community survey of 1475 persons aged 25-74 years, in Cienfuegos, Cuba, was used to identify these factors in a low-resource setting. RESULTS: While half of women with hypertension were controlled, only one-third of men were receiving successful treatment. Gender differences were not seen, however, among those currently taking medications. The largest burden of hypertension in absolute terms was concentrated in the age range 45-64, emphasizing the heavy burden of uncontrolled high blood pressure that falls on middle-aged men. Race-ethnicity was not a determinant of treatment and control status, nor was inability to obtain medication. CONCLUSIONS: These findings largely confirm the pattern observed in industrialized countries and demonstrate the near-universal challenge confronting primary-care systems in physician-based control of cardiovascular risk factors.

Asunto(s)

Antihipertensivos/uso terapéutico , Hipertensión/tratamiento farmacológico , Hipertensión/epidemiología , Población Urbana/estadística & datos numéricos , Adulto , Anciano , Presión Sanguínea/efectos de los fármacos , Estudios Transversales , Cuba/epidemiología , Femenino , Accesibilidad a los Servicios de Salud/estadística & datos numéricos , Humanos , Masculino , Persona de Mediana Edad , Análisis Multivariante , Prevalencia , Factores de Riesgo , Encuestas y Cuestionarios , Insuficiencia del Tratamiento

Asunto(s)

Enfermedades Cardiovasculares/epidemiología , Vigilancia de la Población , Adulto , Anciano , Anciano de 80 o más Años , Femenino , Humanos , Masculino , Americanos Mexicanos , México , Persona de Mediana Edad

RESUMEN

La migración a gran escala que tiene lugar actualmente de México a los Estados Unidos de América origina nuevos retos para la salud pública. Se deben diseñar políticas de salud bien fundamentadas que aborden los problemas emergentes de salud en los estadounidenses de origen mexicano y otras subpoblaciones de los Estados Unidos. En este artículo se describe un enfoque que permite analizar la carga de las enfermedades cardiovasculares (ECV), tanto en mexicanos como en estadounidenses de ascendencia mexicana (en el contexto de la sociedad que acaban de abandonar). Estos datos se analizan también en el contexto de otras poblaciones de ascendencia hispanoamericana. La caracterización rigurosa de la población migrante mexicana permitirá explicar el estado de salud de los estadounidenses de ascendencia mexicana. De manera similar, la copiosa experiencia en salud pública acumulada en los Estados Unidos puede ser útil en la lucha para controlar las ECV en México. El primer paso lógico puede ser alinear los sistemas existentes de datos de los dos países y describir los patrones fundamentales del desenlace y las situaciones de riesgo de la enfermedad.

Asunto(s)

Humanos , Masculino , Femenino , Adulto , Persona de Mediana Edad , Anciano , Anciano de 80 o más Años , Enfermedades Cardiovasculares/epidemiología , Vigilancia de la Población , Americanos Mexicanos , México

Asunto(s)

Enfermedades Cardiovasculares , Vigilancia en Desastres , Americanos Mexicanos , México , Enfermedades Cardiovasculares , Vigilancia de la Población