体重指数和腰围与代谢综合征发生风险的比较研究

目的 比较体重指数、腰围与代谢综合征发生风险的相关性.方法 554例人选者(男316例,女238例),按照体重指数和腰围被分为周围肥胖组192例、腹部肥胖组135例和混合肥胖组237例,7年后进行随访.结果 共随访到520例.周围肥胖组代谢综合征累积发生率26.3%(49/186),腹部肥胖组代谢综合征累积发生率41.7%(50/120),混合肥胖组代谢综合征累积发生率43.0%(92/214).腹部肥胖组和混和肥胖组代谢综合征累积发生率显著高于周围肥胖组(X2分别为7.825和12.082,均P＜0.01),且基线时舒张压、甘油三酯、空腹血糖、空腹胰岛素及稳态模型评估法胰岛素抵抗指数(HOMA-IR)也显著高于前者(均P＜0.05).以有或无代谢综合征分组后基线资料比较,代谢综合征组无论男女,腰围和腰臀比均高于非代谢综合征组(P＜0.01和P＜0.05),体重指数在两组无统计学差异,并且代谢综合征组空腹血糖、空腹胰岛素和HOMA-IR显著高于非代谢综合征组(均P＜0.05).Logistic回归显示,与代谢综合征发生风险相关的因素主要为腰围(P=0.021)、腰臀比(P=0.009)、HOMA-IR(P=0.004).结论 腹部脂肪堆积及胰岛素抵抗是代谢综合征发生的两个重要因素,腰围比体重指数与代谢综合征的发生风险关系更密切.     

Abdominal obesity is associated with increased risk of acute coronary events in men.

AIMS: The purpose of the study was to investigate the associations of abdominal obesity and overall obesity with the risk of acute coronary events. METHODS AND RESULTS: Body mass index indicating overall obesity and waist-to-hip ratio and waist circumference indicating abdominal obesity were measured for 1346 Finnish men aged 42-60 years who had neither cardiovascular disease nor cancer at baseline. There were 123 acute coronary events during an average follow-up of 10.6 years. In Cox regression analyses adjusted for confounding factors, waist-to-hip ratio (P=0.009), waist circumference (P=0.010) and body mass index (P=0.013) as continuous variables were associated directly with the risk of coronary events. These associations were in part explained by blood pressure, diabetes, fasting serum insulin, serum lipids, plasma fibrinogen, and serum uric acid. Waist-to-hip ratio of > or =0.91 was associated with a nearly threefold risk of coronary events. Waist-to-hip ratio provided additional information beyond body mass index in predicting coronary heart disease, whereas body mass index did not add to the predictive value of waist-to-hip ratio. Abdominal obesity combined with smoking and poor cardiorespiratory fitness increased the risk of coronary events 5.5 and 5.1 times, respectively. CONCLUSIONS: Abdominal obesity is an independent risk factor for coronary heart disease in middle-aged men and even more important than overall obesity. Since the effect of abdominal obesity was strongest in smoking and unfit men, the strategy for lifestyle modification to prevent coronary heart disease should address these issues jointly.     

Association between anthropometric measures of obesity and insulin resistance in a self-selected group of Indigenous Australians

Anthropometric markers of obesity are simple means that may be used as markers of cardiovascular risk and insulin resistance. We compare body mass index, waist circumference and waist hip ratio as tools to screen for insulin resistance in 81 overweight Indigenous Australians using ROC curve analysis. Body mass index and waist circumference emerged as better predictors of insulin resistance compared with waist hip ratio.     

肥胖类型与脑卒中亚型的相关性研究

目的探讨肥胖类型与脑卒中亚型的相关性。方法将573例急性脑卒中患者分为脑出血组126例,脑梗死组447例,脑梗死组再分为脑血栓形成组(215例)和腔隙性脑梗死组(232例),另外选择277例无脑卒中者为对照组。测量腰围、臀围和体重,计算体重指数和腰臀比(WHR),分析肥胖参数与脑卒中各亚组的关系。结果脑卒中各亚组与对照组肥胖发生率差异无显著性意义(P>0.05);各组WHR明显大于对照组(P<0.05)。WHR增大明显增加脑卒中各亚组的危险性(P<0.05);女性腹围增大患腔隙性脑梗死危险性升高(P<0.05);男性体重增加患脑出血的危险性升高(P<0.01)。结论腹型肥胖是脑出血、脑血栓形成和腔隙性脑梗死的危险因素之一。     

Anthropometric measures and absolute cardiovascular risk estimates in the Australian Diabetes, Obesity and Lifestyle (AusDiab) Study.

BACKGROUND: Framingham risk functions are widely used for prediction of future cardiovascular disease events. They do not, however, include anthropometric measures of overweight or obesity, now considered a major cardiovascular disease risk factor. We aimed to establish the most appropriate anthropometric index and its optimal cutoff point for use as an ancillary measure in clinical practice when identifying people with increased absolute cardiovascular risk estimates. DESIGN: Analysis of a population-based, cross-sectional survey was carried out. METHODS: The 1991 Framingham prediction equations were used to compute 5 and 10-year risks of cardiovascular or coronary heart disease in 7191 participants from the Australian Diabetes, Obesity and Lifestyle Study (1999-2000). Receiver operating characteristic curve analysis was used to compare measures of body mass index (BMI), waist circumference, and waist-to-hip ratio in identifying participants estimated to be at 'high', or at 'intermediate or high' absolute risk. RESULTS: After adjustment for BMI and age, waist-to-hip ratio showed stronger correlation with absolute risk estimates than waist circumference. The areas under the receiver operating characteristic curve for waist-to-hip ratio (0.67-0.70 in men, 0.64-0.74 in women) were greater than those for waist circumference (0.60-0.65, 0.59-0.71) or BMI (0.52-0.59, 0.53-0.66). The optimal cutoff points of BMI, waist circumference and waist-to-hip ratio to predict people at 'high', or at 'intermediate or high' absolute risk estimates were 26 kg/m2, 95 cm and 0.90 in men, and 25-26 kg/m2, 80-85 cm and 0.80 in women, respectively. CONCLUSIONS: Measurement of waist-to-hip ratio is more useful than BMI or waist circumference in the identification of individuals estimated to be at increased risk for future primary cardiovascular events.     

Obesity indices and cardiovascular risk factors in Thai adults

OBJECTIVE: To examine the relationship of body mass index (BMI), waist circumference (WC), waist-to-hip ratio (WHpR) and waist-to-height ratio (WHtR) with cardiovascular risk factors and diabetes in Thai population. DESIGN: A national cross-sectional survey of cardiovascular risk factors. SUBJECTS: Five thousand and three hundred five Thai adults aged > or =35 years. MEASUREMENTS: Body weight, height, waist and hip circumference and cardiovascular risk factors including blood pressure, total plasma cholesterol, high-density lipoprotein, triglyceride and fasting plasma glucose were measured. Age- and sex-specific means and prevalence of cardiovascular risk factors were calculated and compared among anthropometric measurements. RESULTS: There were increasing trends of severity of cardiovascular risk factors and prevalence of morbidity conditions across increasing levels of BMI, WC, WHpR and WHtR categories. For age group > or =65 years, WC, WHpR and WHtR provided more consistent association with cardiovascular risk factors than BMI. Area under the curve indicated that measurement of central obesity could predict cardiovascular risk better than BMI. The optimal cutoff points for anthropometric measurements were in line with the Asia-Pacific recommendation; however, similar cutoff point for men and women between 82 and 85 cm was observed. CONCLUSION: Central obesity indices were slightly better associated with cardiovascular risk factors compared to BMI in Thai adults aged > or =35 years.     

Microalbuminuria and obesity: impact on cardiovascular disease and mortality

Objective  Microalbuminuria and obesity are both associated with cardiovascular disease (CVD). The aim of this study was to determine the association between obesity (measured by body mass index, waist-to-hip ratio, waist circumference) and different levels of microalbuminuria. We also aimed to determine the risk of death and CVD at different levels of microalbuminuria and obesity.
Design  Population-based observational study based on 2696 men and women, 30–70 years of age. Urinary albumin excretion (UAE), body mass index, waist-to-hip ratio, waist circumference and other cardiovascular risk factors were measured during the years 1992–1994 at the Copenhagen City Heart Study. End-points were registered until 1999–2000 with respect to CVD and until 2004 with respect to death.
Results  There was a strong association between microalbuminuria and obesity. Microalbuminuria and obesity had additive effects on the relative risk of death independently of other risk factors. In contrast there was no statistically significant association between microalbuminuria and risk of CVD when stratified by obesity.
Conclusions  Microalbuminuria (UAE > 5 µg/min) confers increased risk of death and to a similar extent as obesity. This effect is independent of concomitant obesity. We suggest microalbuminuria to be included in health examinations besides measurements of obesity.     

A Val227Ala substitution in the peroxisome proliferator activated receptor alpha (PPAR alpha) gene associated with non-alcoholic fatty liver disease and decreased waist circumference and waist-to-hip ratio

Background and Aim:  This study analyzes the effect of the val227ala variant of the peroxisome proliferators-activated receptor-alpha (PPAR-α) on non-alcoholic fatty liver disease.
Methods:  79 patients with NAFLD and 63 healthy counterparts were included in the study. Body mass index (BMI), hip, waist, waist-to-hip ratio (WHR), blood pressure (BP), the percentage of body fat, total protein, albumin, ALT, triglyceride, cholesterol, HDL and fasting blood glucose were assessed. The genotypes were analyzed using oligonucleotide microarray. Logistic model was used to perform the multi-factors synthetical analysis on the data obtained to screen the risk factors closely associated with Val227Ala polymorphism of PPAR-α gene.
Results:  There were 6.33% (5/79) subjects with CC/CT genotype (ala227ala and val227ala) and 93.67% (74/79) subjects with TT genotype (val227val) in patients with NAFLD, and there were 20.63% (13/63) with CC/CT genotype and 79.37% (50/63) subjects with TT genotype. The distribution of PPAR-α val227ala polymorphism between NAFLD and healty subjects was significant (p = 0.011). The level of weight, body mass index, hip circumference, waist circumference, waist-hip ratio, percentage of body fat, abdominal wall fat thickness in subjects with Val227Ala variant were significantly lower than that in Val227wide type. The results showed that waist circumference and WHR were related with the PPAR-α val227ala polymorphism.
Conclusion:  PPAR-α val227ala polymorphism may be involved in the pathogenesis of NAFLD and play a protective role in obesity.     

Gender differences in metabolic risk factor prevalence in a South African student population

Summary

We determined selected risk factors for the metabolic syndrome and assessed the metabolic risk status (using IDF criteria) of third-year physiology students at Stellenbosch University (88 males and 178 females). Outcome measures included anthropometry [body mass index (BMI), waist circumference, waist-to-hip ratio], blood pressure (BP), resting pulse rate, and fasting blood glucose, total cholesterol and triglyceride levels. In addition, students completed a lifestyle questionnaire.A number of gender-based differences were found, with male students displaying a greater incidence of risk factors for the metabolic syndrome: 6% of males versus 3% of females displayed a cluster of three risk factors. Twenty-five per cent of female students (but only 14% of males) exhibited waist circumferences above the accepted range, which was positively correlated, for males and females, with both systolic and diastolic BP, and in females only, also with total cholesterol levels. Male students on average exercised more than their female counterparts, but also exhibited poorer eating habits. Average blood triglyceride levels for both male and female students exceeded the accepted threshold (1.85 ± 1.62 mmol/l and 2.15 ± 1.79 mmol/l, respectively).We concluded that metabolic risk factors were evident in a much younger population than commonly expected. Moreover, the gender-specific differences observed may impact on future risk assessment and preventative measures adopted.     

Influence of body fat content and distribution on variation in metabolic risk

OBJECTIVES: Several reports indicate that the body fat compartments, especially ip fat, predict metabolic risk better than total body fat. The objective of the study was to determine whether this can be confirmed and generalized throughout the population. PARTICIPANTS: A representative sample of 1934 Black and White women and men of the Dallas Heart Study participated in the study. DESIGN: We measured the fat in total body, trunk, and lower body with dual-energy x-ray absorptiometry and in abdominal compartments (sc, ip, and retroperitoneal) with magnetic resonance imaging. Other measurements included body mass index (BMI), waist circumference, blood pressure, plasma lipids, glucose, insulin (including homeostasis model), and C-reactive protein. RESULTS: In all groups, total body fat correlated positively with key metabolic risk factors, i.e. homeostasis model, triglyceride/high-density lipoprotein-cholesterol ratios, C-reactive protein, and blood pressure; however, it explained less than one third of the variability of all the risk factors. After adjustment for total body fat, truncal fat conferred additional positive correlation with risk factors. Furthermore, with multivariable regression analysis, ip fat conferred independent correlation with plasma lipids beyond a combination of other compartments including truncal fat. Still, except for insulin levels, all combinations including ip fat still explained less than one third of the variability in risk-factor levels. Conversely, lower body fat correlated negatively with risk factors; i.e. lower body fat appeared to offer some protection against risk factors. CONCLUSIONS: Body fat distribution has some influence on risk factors beyond total body fat content. Both waist circumference and BMI significantly predicted risk factors after adjustment for total body fat, and for clinical purposes, most of the predictive power for men was contained in waist circumference, whereas for women, BMI and waist circumference were similarly predictive. Finally, even though the correlations between combined body fat parameters and risk factors explained only a portion of the variation in the latter, the average number of categorical metabolic risk factors increased progressively with increasing obesity. Hence, obesity seemingly has more clinical impact than revealed in these correlative studies.     

Relationship between stature, overweight and central obesity in the adult population in S?o Paulo, Brazil.

OBJECTIVE: To test association between overweight, central obesity and stature. DESIGN: Cross-sectional study carried-out between 1990-1991. SUBJECTS: 951 adults (387 male and 564 female) aged 20-64 y, resident in the metropolitan area of S?o Paulo, Brazil. MEASUREMENTS: Anthropometry, blood lipid concentrations (total, high density lipoprotein (HDL) and low density lipoprotein (LDL)-cholesterol, triglycerides (TGs) and blood glucose. Body mass index (BMI), waist-to-hip ratio (WHR) and waist circumference were used to identify overweight (BMI > 25 kg/m2), abdominal obesity (WHR tertile 3 and waist circumference tertile 3), respectively. The subjects were categorised as those of short stature (women < 150 cm, men < 162cm) and those of normal stature (women > or = 150 cm, men > or = 162 cm). RESULTS: Prevalence of short stature was 19.6% and 15.4% in men and women, respectively. Short stature women had higher serum concentrations of total cholesterol, LDL-cholesterol, TGs and glucose than those of normal stature. Among men, this difference was not observed, except for glucose concentrations. Short stature women had high BMI and WHR means in some age categories, compared with those of normal stature. Both overweight and high WHR frequencies were greater in short stature women than in those of normal ones. In multivariate analysis, adjusted by age, income, marital status, education, physical activity and tobacco use, only women group with short stature compared with normal stature had significantly risk of overweight an high WHR. In the same group there was no association with waist circumference. Among the men there was significant opposite association with waist circumference. CONCLUSION: Short stature in women can potentially be an independent risk factor for overweight and high WHR.     

超重和肥胖者血管内皮功能障碍的相关因素分析

目的探讨超重和肥胖者血管内皮功能障碍的相关因素.方法367例单纯超重和肥胖者,其中血管内皮功能正常组122例,血管内皮功能异常组245例.通过反应性充血时肱动脉内径变化,评估血管内皮功能,并对体脂含量和分布、血压、血糖、胰岛素、血脂、肌酐、尿酸和胰岛素抵抗指数(HOMA-IR)等指标进行测定,应用相关分析和多元线性回归方程分析血管内皮功能与上述指标的相关性.结果血管内皮功能异常组的腰围、腰臀比、餐后血糖、空腹胰岛素、餐后胰岛素和HOMA-IR均显著高于血管内皮功能正常组(P＜0.05～0.01).进一步分析表明内皮依赖性血管舒张功能与体重指数、腰围、腰臀比、空腹胰岛素及HOMA-IR呈负相关,其中腰臀比和空腹胰岛素是内皮依赖性血管舒张功能损伤的重要相关因素.结论单纯超重或肥胖人群中,向心性肥胖及空腹胰岛素水平升高是影响血管内皮功能的重要因素.     

Body composition, C-reactive protein, carotid artery remodeling and subclinical atherosclerosis in a general Taiwanese population

Obesity, an escalating problem worldwide, increases the risk of serious disease, particularly atherosclerosis. A community-based cross-sectional study was designed to screen for undetected atherosclerosis. High-sensitivity C-reactive protein (hs-CRP), the presence of the metabolic syndrome (MetS), and ultrasound studies to detect fatty liver and measure carotid intimal–medial thickness were performed. A total of 1,005 subjects (595 men and 410 women; mean age of 52.4 ± 11.1 years) were included in the final study cohort. 237 subjects (23.7%) fulfilled National Cholesterol Education Program Adult Treatment Panel ATP-III criteria for MetS. Significant differences between female and male subjects were noted in body mass index (BMI), % body fat mass (Fat%), waist-to-hip ratio, waist circumference, fasting glucose levels, triglyceride levels, fatty liver, and carotid artery changes (P < 0.05). When female subjects were classified by hs-CRP levels, significant differences were reported among the three groups in age, BMI, Fat%, waist-to-hip ratio, waist circumference, blood pressure, fasting glucose, HDL, triglycerides, fatty liver grade and common carotid artery changes (P < 0.05). In this study, high hs-CRP was associated with increased cholesterol and cardiovascular changes supporting the idea that it may be a useful biomarker for detecting early asymptomatic vascular and coronary heart disease resulting from obesity.     

Sagittal abdominal diameter and waist circumference appear to be equally good as identifiers of cardiometabolic risk

Background and aimsBody mass index (BMI) and waist circumference (WC) are commonly used markers of cardiometabolic risk. However, sagittal abdominal diameter (SAD) has been proposed as a possibly more sensitive marker of intra-abdominal obesity. We investigated differences in how SAD, WC, and BMI were correlated with cardiometabolic risk markers.Methods and resultsThis cross-sectional study investigated anthropometric and metabolic baseline measurements of individuals from six trials. Multiple linear regression and (partial) correlation coefficients were used to investigate associations between SAD, WC, and BMI and cardiometabolic risk markers, including components of the metabolic syndrome as well as insulin resistance, blood lipids, and lowgrade inflammation.In total 1516 mostly overweight or obese individuals were included in the study. SAD was significantly more correlated with TG than WC for all studies, and overall increase in correlation was 0.05 (95% CI (0.02; 0.08). SAD was significantly more correlated with the markers TG and DBP 0.11 (95% CI (0.08, 0.14)) and 0.04 (95% CI (0.006, 0.07), respectively compared to BMI across all or most studies.ConclusionThis study showed that no single anthropometric indicator was consistently more strongly correlated across all markers of cardiometabolic risk. However, SAD was significantly more strongly correlated with TG than WC and significantly more strongly correlated with DBP and TG than BMI.     

Increased occurrence of diabetes in people with ischemic cardiovascular disease and general and abdominal obesity

BACKGROUND: Diabetes worsens the prognosis of patients with ischemic cardiovascular disease (ICVD). Increased body weight and abdominal obesity have been shown to increase the risk of diabetes in people without ICVD. Such a relationship has not been assessed in patients with ICVD who may have a different occurrence due to their disease and medications. OBJECTIVE: To examine the risk of developing diabetes among patients with ICVD according to body mass index (BMI), waist-to-hip ratio and waist circumference METHODS: Anthropometric measurements were done in 4699 men and 1187 women with ICVD (mean age 66 years) and without known diabetes at entry to the Heart Outcomes Prevention Evaluation (HOPE) study. During the median 4.5-year follow-up, a diagnosis of diabetes was reported in 261 (4.4%) participants. RESULTS: There was a positive and graded association between increased BMI, waist circumference and waist-to-hip ratio, and the risk of developing diabetes (P for trends <0.0001). After adjusting for all baseline characteristic differences including medications, the relative risk of developing diabetes after the first 40th percentile of each anthropometric measure increased by 12% (95% CI 9% to 15%) for every 1 kg/m2 increase in BMI; the relative risk increased by 5% (95% CI 4% to 6%) for every 1 cm increase in waist circumference and by 38% (95% CI 18% to 61%) for every 0.1 unit increase in waist-to-hip ratio. CONCLUSION: In patients with ICVD, increased BMI, waist-to-hip ratio and particularly waist circumference constitute independent risk factors for development of diabetes.     

Impact of metabolic syndrome on brachial-ankle pulse wave velocity in Japanese.

The aim of this study was to determine the effect of metabolic syndrome on brachial-ankle pulse wave velocity (baPWV) by using the new guidelines for diagnosis of this syndrome in Japan. We examined 525 men and women without a history of cardiovascular disease or cancer, and an ankle-brachial index < 0.9. The baPWV was measured using a device (Form PWV/ABI) that simultaneously monitored bilateral brachial and ankle pressure wave forms. Metabolic syndrome was defined as a waist circumference > or = 85 (90) cm in men (women) and two or more of the following risk factors: hypertension, dyslipidemia, and glucose intolerance diagnosed by a 75 g oral glucose tolerance test. The baPWV showed a significant linear relationship with waist circumference, waist-to-hip ratio, body fat, systolic and diastolic blood pressure, triglycerides, fasting glucose, 2-h-postload glucose, fasting insulin, and glycosylated hemoglobin-A1c, after adjusting for sex and age. These factors were also strongly related to fasting insulin levels. When subjects were classified into six groups based on waist circumference and the number of risk factors for metabolic syndrome (0, 1, and > or =2), we found that more risk factors clearly increased the odds ratios for an elevated baPWV in those subjects in the highest quartile of the baPWV distribution in multivariate logistic models. An increase in odds ratio was observed despite a normal waist circumference and may well have been due to increased fasting insulin and blood pressure levels. An increase in the number of risk factors for metabolic syndrome was highly correlated with an increased baPWV, probably due to insulin resistance.     

Sagittal abdominal diameter compared with other anthropometric measurements in relation to cardiovascular risk

BACKGROUND: Abdominal adiposity has been described as an independent risk factor for coronary heart disease. Sagittal abdominal diameter has been found to be closely related to the amount of visceral adipose tissue. AIM: To compare the sagittal abdominal diameter with other anthropometric measures regarding their relationships to risk factors for coronary heart disease (CHD). DESIGN: A study of 885 men and women participating in a health survey. MEASUREMENTS: Sagittal abdominal diameter, body mass index (BMI), waist and hip circumferences, waist-to-hip ratio, serum concentrations of risk factors for CHD, blood pressure. RESULTS: In men the sagittal abdominal diameter showed stronger correlations to the CHD risk factors serum cholesterol, low-density lipoprotein (LDL) cholesterol, triglycerides, glucose, insulin, apolipoprotein B (apoB), plasminogen activator inhibitor tissue-type plasminogen activator (t-PA) and lipid-corrected alpha tocopherol, and to systolic and diastolic blood pressures than the other anthropometric measurements. In women, compared with the other anthropometric measurements the sagittal abdominal diameter was more strongly correlated to serum cholesterol, LDL cholesterol, LDL/HDL (high-density lipoprotein), apo B and t-PA, and to systolic and diastolic blood pressure. The sagittal abdominal diameter showed a stronger correlation to 'total risk' for cardiovascular disease (+ 0.66 for men, 0.62 for women), than waist circumference (+ 0.63 for men, + 0.57 for women) and waist-to-hip ratio (+ 0.61 for men and +0.48 for women; P <0.0001 for all correlations). This diameter was also more strongly correlated to 'metabolic risk' (+ 0.64 for men, + 0.59 for women) than waist circumference (+ 0.60 for men, + 0.59 for women) and waist-to-hip ratio (+ 0.58 for men, + 0.52 for women)(P < 0.0001 for all correlations). In a regression analysis including the anthropometric measurements and the risk values, the sagittal diameter was the strongest measure of cardiovascular risk in both men and women. CONCLUSIONS: Among both men and women in this study the sagittal abdominal diameter showed stronger correlations to cardiovascular risk and to other risk factors in the metabolic syndrome than other anthropometric variables such as waist circumference, waist-to hip ratio and BMI.     

A study in the relationships between leptin, insulin, and body fat in Asian subjects

OBJECTIVE: To study the relationship of leptin concentrations with indices of obesity, fasting insulin, insulin resistance and lipid profiles (total cholesterol, low density lipoprotein (LDL)-cholesterol, high density lipoprotein (HDL)- cholesterol and triglyceride) in an Asian cohort. DESIGN: Cross sectional study. SUBJECTS: A total of 133 healthy volunteers were enrolled (64 female: age: 25-61 y, body mass index (BMI): 18.7-45.1 kg/m2 and 69 male: age: 25-61 y, BMI: 19.3-35.0 kg/m2). MEASUREMENTS: Weight, height, waist and hip circumferences, blood pressure, lean body mass (by bioelectric impedence analysis (BIA)), plasma leptin and lipid profiles were taken after a 10 h fast. RESULTS: Percentage of body fat measured by bioelectric impedance was the strongest determinant of plasma leptin (r = 0.844, P < 0.0001). Females had higher leptin concentrations than males for the same fat mass. In a multiple linear regression model, body fat percentage, (percentage body fat* gender), hip circumference and fasting insulin were significant determinants of leptin concentration (r = 0.882, P < 0.0001). CONCLUSION: Leptin concentration correlated closely with percentage body fat in Asian subjects. Hip circumference as a corollary for peripheral obesity, was better associated with leptin than waist circumference or waist-to-hip ratio (WHR). Distribution of fat in females tended to be peripheral and may partly explain the gender difference. Fasting insulin level and central obesity were correlated with HDL-cholesterol, triglyceride and blood pressure, while fasting leptin had little correlation with these metabolic parameters. Therefore, insulin resistance was a better guide to cardiovascular risk assessment than plasma leptin.     

肥胖指标在研究心血管危险因素中的意义

目的探讨体质指数(BMI)和中心性肥胖指标与糖尿病(DM)、高血压患病风险的关系。方法采用横断面研究方法,入选2980名男性和3850名女性(年龄35～74岁)。分别检测受检者的BMI、腰围(WC)、腰臀比(WHR)、腰围与身高的比值(WSR)、空腹血糖(FBG)、餐后2 h血糖(2 hPG)和血压,并分析BMI、WC、WHR和WSR与心血管疾病的危险因素变量(FBG、2 hPG、收缩压或舒张压)的关联。应用受试者工作特征曲线(ROC)下面积,评估检测的各项人体测量指标与DM和高血压关联程度的特异度和敏感度。结果 (1)BMI、WC、WHR和WSR之间相关系数差异有统计学意义(P<0.001),以WC和WSR间相关系数最大(男:0.94,女:0.95)。(2)与BMI相比,男性WSR与DM的关联更强(P=0.081),女性WC和WSR的关联更强(P<0.05)。ROC下面积经年龄调整为男性WSR 0.735和女性WC 0.749,均较BMI 0.725大。(3)与中心性肥胖指标比较,不论男女,BMI与高血压有最强的关联(BMI比WHR,P<0.001;比WSR,P<0.01;比WC,P<0.05)。BMI的ROC曲线下面积经年龄调整分别为男性WSR 0.760和女性WC 0.766,均较相应的中心性肥胖指标高。结论中心性肥胖指标与BMI比较,前者可能与DM患病风险关联更大;而后者可能导致高血压患病风险更大。     

2型糖尿病脂联素、瘦素、脂联素与瘦素比值与代谢综合征组分关系的研究

目的观察脂联素、瘦素、脂联素与瘦素的此值（A／L）和代谢综合征的关系。方法初诊2型糖尿病患者260例,放免法检测Fins、脂联素、瘦素水平,计算胰岛素抵抗指数,并以脂联素、瘦素及其比值作为因变量进行多元回归分析。结果肥胖较非肥胖患者有较低的脂联素、A／L,较高的瘦素;胰岛素敏感的患者相对于胰岛素抵抗的患者,有较高的脂联素、A／L和较低的瘦素;A／L与代谢有关变量、胰岛素抵抗及相关变量都有明显的相关性。结论2型糖尿病患者脂联素、瘦素和A／L与肥胖、胰岛素抵抗及代谢综合征的表达有明显的相关性。据此推测脂联素、瘦素、A／L有可能成为进一步研究代谢综合征的发病机制及其诊断标准的指标。