Background Although both obesity, measured by body mass index, and visceral obesity are known to be major risk factors of metabolic syndrome and its components, there have been debates on the relative contribution of general obesity and visceral obesity to the development of metabolic syndrome.
Methods We performed a large longitudinal cohort study of 3,093 subjects (age range, 18–65 years) who were metabolically healthy and had a normal weight who received health screenings over a 3-year follow-up period. Cox proportional hazards models were used to estimate the adjusted hazard ratios (HRs) and 95% confidence intervals (CI) for incident metabolic syndrome and its components per sex-specific 1-standard deviation (SD) increase in visceral adipose tissue (VAT) and body mass index.
Results Both obesity and visceral obesity increased the risk of incident metabolic syndrome, but when HR was compared per sex-specific 1-SD, visceral obesity appeared to confer more risk than simple obesity. The HR for 1-SD of body mass index was 1.19 (95% CI, 1.07–1.32; P=0.001) in men and 1.29 (95% CI, 1.10–1.52; P=0.002) in women, while the HR for 1-SD of VAT was 1.29 (95% CI, 1.15–1.44; P<0.001) in men and 1.50 (95% CI, 1.28–1.75; P<0.001) in women.
Conclusion Visceral obesity and obesity were longitudinally associated with an increased risk of incident metabolic syndrome among metabolically healthy adults, and visceral fat accumulation appears to be better predictor of metabolic syndrome.
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Background : Increased abdominal obesity is clearly associated with metabolic diseases and associated with increased risk for atherosclerosis and cardiovascular diseases. But the mechanisms underlying these associations are not completely understood. The aim of this study was to correlate the regional body composition with pulse wave velocity in the overweight and obese women.
Methods : We investigated 104 overweight and obese participants. Regional body composition was distinguished by anthropometry, dual-energy X-ray absorptiometry, and computed tomography (CT). For estimates of arterial stiffness, we measured brachial ankle pulse wave velocity (baPWV). Fasting blood glucose, lipid parameters, CRP, and free fatty acid were measured. Pearson's correlation analysis and multiple regression analysis were conducted to identify the relationship between baPWV and regional body composition.
Results : Average age, fasting blood sugar, HDL-cholesterol, triglyceride, HOMA-IR, abdominal visceral fat area measured by CT, visceral fat area/ subcutaneous fat area (VSR), and visceral fat area/midthigh muscle area (VMR) were all significantly higher in the visceral obesity group than the subcutaneous obesity group. BaPWV was positively correlated with age, blood pressure, triglyceride, waist circumference, waist hip ratio, abdominal visceral fat area measured by CT, and VSR and inversely correlated with thigh subcutaneous fat area. In multiple regression models, after adjustment for confounding factors, baPWV was independently correlated with abdominal visceral fat area measured by CT (R2=0.560, P=0.006).
Conclusion : Abdominal visceral fat area measured by CT was the only measurement positively associated with baPWV which explains the relationship of regional body composition and arterial stiffness.
Background : Physical fitness is defined as the ability to carry out work necessary for muscle exercise satisfactorily. Generally, obese person have been considered to have low physical performance. In addition, obesity has been known to be a risk factor of cardiovascular disease such as hyperlipidemia, hypertension, and coronary arterial disease. Based on previous epidemiologic studies, abdominal obesity, especially, visceral obesity, is thought to be more important risk factor for cardiovascular disease rather than obesity itself. Therefore, the interest on assessment of abdominal visceral fat has been increasing. The aim of this study was to see the difference in physical fitness and blood pressure according to obesity degree assessed by BMI, and compare the anthropometric obesity indices with abdominal visceral fat accumulation measured by abdominal CT (Computed Tomogram).
Methods : Four hundred thirty-two subjects, who participated in the exercise program for more than one month duration at the 'Clinic for Obesity' in St. Mary's Hospital from November 1998 to June 2000, were included in the analysis. They were categorized into 4 groups [severe obesity group (BMI≥30), obesity group (25≤BMI＜30), overweight group (23≤BMI＜25), normal group (BMI＜23)] according to their BMI. Blood pressure, anthropometric obesity indices and physical fitness (V02 max, back muscle strength, sit up, forward bending, vertical jump, side step, balance) were measured by one skillful exercise trainer. Among them, one hundred thirty-one subjects performed abdominal CT to assess visceral fatness. We compared anthropometric indices (waist to hip ratio, body mass index, abdominal circumference, skin foldness) with abdominal visceral fat accumulation measured by CT.
Results : Blood pressure, cardiovascular endurance, muscular endurance, muscle strength, speed and balance were significantly different among the four groups categorized by BMI in both sexes, but flexibility and agility were not significant. In women, the correlation coefficients between visceral fat area measured by abdominal CT and each of waist to hip ratio, BMI, abdominal circumference, and skin foldness adjusted for age were 0.487, 0.479, 0.464, 0.31, respectively (P＜0.01). However in men, there were no significant correlations.
Conclusion : Obesity tended to increase blood pressure, and reduce physical performance. Only in women, obesity related indices reflected the abdominal visceral fat accumulation.
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