Long working hours and overweight and obesity in working adults

BACKGROUND: Previous studies have identified a link between gender and the various risk factors associated with obesity. We examined obesity risk factors in working adults to identify the effects of differences in body mass index (BMI) and percentage body fat (PBF) between women and men. METHODS: A total of 1,120 adults agreed to participate in the study. Data from 711 participants, including 411 women and 300 men, were analyzed. Multiple logistic regression analysis was used to estimate the effects of risk factors on obesity and being overweight. In addition, the least-squares (LS) means of both BMI and PBF were estimated by analysis of covariance (ANCOVA) in a generalized linear model.  RESULTS: Increases in BMI and PBF were significantly related to an age > 50 years and long working hours in women after compensating for confounding factors. Using the PBF criterion, the odds ratio (OR) of being overweight or obese in women > 50 years of age who worked for > 9 h a day was 3.9 (95% confidence interval [CI], 1.05–11.00). For BMI, women who were > 50 years of age and worked for > 9 h a day were 3.82 times (95% CI, 1.31–11.14) more likely to be overweight or obese than those who were 50 years of age and long working hours in women. Further studies are needed to investigate the underlying mechanisms of this relationship and its potential implications for the prevention and management of excess weight and obesity.

The correlation between body mass index and percentage body fat in people of different gender and nationality and their application assessment / 国际检验医学杂志

Objective To analyze the correlation between body mass index(BMI)and percentage body fat(PBF)in people of dif-ferent nationality and gender,and assess the value of BMI and PBF in the diagnosis of obesity.Methods A total of 925 healthy a-dults who underwent physical examination in the hospital were enrolled in the study,bioelectrical impedance measurement was used to measure the weight,PBF,then analyze the correlation between BMI and PBF in people of different nationality and gender.Results In the normal and overweight population classified by BMI,;In underweight,overweight and obesity people,PBF of Han women were higher than that of Uighur women(P <0.05 ).In people of different gender and ethnic group,PBF was positively correlated with BMI(P <0.05).Using BMI≥28 kg/m2 as gold standard for the diagnosis of obesity,PBF have good sensitivity and low speci-ficity for the diagnosis of obesity in both of the two ethnic groups.Conclusion Compared with Uygur,Han have higher PBF at the same level of BMI.There is a malconformation between BMI and PBF.Evaluation of obesity could not simply rely on BMI,and should be analyzed combined with PBF.

Evaluation of obesity by body mass index,waist-hip-ratio and percentage body fat in adolescent / 重庆医学

Objective To compare the sensitivity of body mass index (BMI),waist-hip ratio (WHR)and percentage body fat (PBF)in the evaluation of the obese adolescents population,and find a more sensitive evaluation method.Methods In this study,2 045 adolescents were recruited in the city of Chongqing by using multiple-stage random cluster sampling,and they were identified as overweight or obesity on the base of BMI,WHR and PBF.Results There was significant difference among the detection rate of the three methods (PBMI(0.918)>WHR (0.694). Conclusion The sensitivity of PBF and BMI was higher.Although the WHR sensitivity was lower,WHR is a good predictor asso-ciated for chronic diseases,which suggests that the development of appropriate adolescent WHR standard is necessary.

Percentage Body Fat in Apparently Healthy School Children From Northern India.

Context: Increased prevalence of obesity in childhood and adolescence, defined by the use of body mass index (BMI), has drawn attention towards direct measurement of body fat Objective: To develop age-and sex-specific reference distribution of body fat in apparently healthy North-Indian children in the age group of 7-17 years and to assess agreement between obesity (defined by BMI) and excess body fat Design: Study subjects for this cross sectional study included1640 apparently healthy school children (825 boys; 815 girls) aged 7-17 years. Total body fat was measured by dual energy X-rays absorptiometry (DXA). The excess body fat by DXA was defined by two methods, prevalence matching and with the use of 85th and 95th centile cutoffs. Results: The mean ± SD, 3rd, 10th, 25th, 50th, 75th, 90th and 97th centile values of percentage body fat (PBF) are presented. PBF was highly correlated with BMI in both boys and girls (all boys: r=0.76, P<0.0001; all girls r=0.81, P<0.0001). There was no significant difference noted in PBF between boys and girls at the age of 7-8 years. From 9 years onwards, girls had significantly higher PBF than boys. Moderate degree of agreement was observed between BMI and PBF by DXA by both methods. Conclusions: Smoothened reference distribution of PBF for North-Indian children and adolescents in Delhi are provided. Indian children accumulate more body fat during peri-pubertal years in comparison with US children.

Body fat percentage of urban South African children: implications for health and fitness / El porcentaje de grasa corporal en niños sudafricanos urbanos: implicaciones para la salud y la condición física

OBJECTIVE: To explore gender and racial profiling of percentage body fat of 1136 urban South African children attending public schools in Pretoria Central. METHODS: This is a cross-sectional survey of 1136 randomly selected children (548 boys and 588 girls) aged 9-13 years in urban (Pretoria Central) South Africa. Body mass, stature, skinfolds (subscapular and triceps) were measured. Data were analysed using descriptive statistics (means and standard deviations). Differences in the mean body fat percentage were examined for boys and girls according to their age group/race, using independent t-test samples. RESULTS: Girls had a significantly (p = 0.001) higher percentage body fat (22.7 ±5.7% (95% CI = 22.3, compared to boys (16.1 ± 7.7%, 95% CI = 15.5, 16.8). Percentage body fat fluctuated with age in both boys and girls. Additionally, girls had significantly (p = 0.001) higher percentage body fat measurements at all ages compared to boys. Viewed racially, black children (20.1 ± 7.5) were significantly (p = 0.010) fatter than white children (19.0 ± 7.4) with a mean difference of 4.0. Black children were fatter than white children at ages 9, 10, 12 and 13 years, with a significant difference (p = 0.009) observed at age 12 years. CONCLUSION: There was a considerably higher level of excessive percentage body fat among school children in Central Pretoria, South Africa, with girls having significantly higher percentage body fat compared to boys. Racially, black children were fatter than white children. The excessive percentage body fat observed among the children in this study has implications for their health and fitness. Therefore, an intervention programme must be instituted in schools to prevent and control possible excessive percentage body fat in this age group.

OBJETIVO: Explorar la evaluación por perfil de raza y género del porcentaje de grasa corporal de 1136 niños sudafricanos de áreas urbanas, que asisten a escuelas públicas en Pretoria Central. MÉTODOS: Se trata de un estudio transversal de 1136 niños seleccionados aleatoriamente (548 niños y 588 niñas) de 9-13 años de edad en Sudáfrica urbana (Pretoria Central). Se midieron la masa corporal, la estatura, y los pliegues cutáneos (tríceps y subescapular). Los datos fueron analizados mediante estadística descriptiva (medias y desviaciones estándar). Se examinaron las diferencias en el porcentaje degrasa corporal promedio de niñosyniñas según su grupo de edad/raza, utilizando prueba t para muestras independientes. RESULTADOS: Las niñas presentaban un porcentaje de grasa corporal (22.7 ±5.7%, 95% CI= 22.3, 23.2) significativamente mayor (p = 0.001) en comparación con los niños (16.1 ± 7.7%, 95% CI = 15.5, 16.8). El porcentaje de grasa corporal fluctuó con la edad tanto en los niños como en las niñas. Además, las niñas presentaron mediciones de grasa corporal significativamente más altas (p = 0.001) para todas las edades, en comparación con los niños. Racialmente, los niños negros (20.1 ± 7.5) fueron significativamente (p = 0.010) más gordos que los niños blancos (19.0 ± 7.4) con una diferencia media de 4.0. Los niños negros eran más gordos que los niños blancos en las edades de 9, 10, 12 y 13 años, con una diferencia significativa (p = 0.009) observada en la edad de 12 años. CONCLUSIÓN: Hubo un nivel considerablemente superior de porcentaje de grasa corporal excesiva entre los escolares de Pretoria Central, Sudáfrica, poseyendo las niñas un porcentaje de grasa corporal significativamente mayor que los niños. Racialmente, los niños negros eran más gordos que los niños blancos. El porcentaje de grasa corporal excesiva observada entre los niños de este estudio tiene implicaciones para su salud y su condición física. Por lo tanto, un programa de intervención debe ser instituido en las escuelas para prevenir y controlar posibles excesos en ea porcentaje de grasa corporal en este grupo etario.

Percent Body Fat and Abdominal Circumference Cutoff Points Accounted for 85th and 95th Percentile of Body Mass Index in One City of Gyeonggi Province

BACKGROUND: Childhood obesity is becoming more prevalent, associated with a variety of adverse consequences which leads to adulthood obesity. Although diagnosis is usually made by body mass index, there is neither a cutoff point for the percentage body fat nor abdominal circumference. The aim of this study was to identify each cutoff point for both measures. METHODS: The measurement of height, weight, abdominal circumference and percentage body fat was performed through manual assessment and bioelectrical impedance analysis for 4,242 subjects aged 11 in Gunpo City, South Korea. The cutoff point for body fat percentage and abdominal circumference is set to maximize the sum of sensitivity and specificity for detecting obesity and overweight using the Receiver Operating Characteristics (ROC) curve. RESULTS: The mean percentage body fat was 13.6+/-6.9% for boys and 19.4+/-5.3% for girls. The mean abdominal circumference of boys was 68.0+/-9.1 cm, and that of girls was 64.3+/-7.7 cm. The cutoff point of percentage body fat for obesity was 21.8% in boys and 24.5% in girls. The prevalence of obesity was 15.2%, 16.7% for males and females, respectively. The abdominal circumference cutoff for obesity was 76.9 cm in boys and 70.7cm in girls. Based on that, the prevalence of obesity was 19.7% for boys and 20.0% for girls, which was higher than what was identified by body mass index, as in the case of body fat percentage. CONCLUSION: The cutoffs of body fat percentage and abdominal circumference in one city of Gyeonggi Province were lower than those suggested in the previous studies.

SERUM LIPID LEVELS IN MALE AND FENALE HIGH SCHOOL FRESHMEN WITH MASKED OBESITY / 体力科学

Masked obesity is the presence of obesity based on percent body fat (%BF) when the body mass index (BMI) shows an absence of obesity. To examine the relationship between masked obesity and arteriosclerosis risk factors, we compared both serum lipid levels and the prevalence of hyperlipidemia in male and female high school freshmen with and without masked obesity. Subjects consisted of 403 male and 326 female high school students aged 15∼16 years. Of these, 34(8.4%) males and 36(11.0%) females had masked obesity, defined as 17≤BMI<23.60 and %BF≥25% in males, and 17≤BMI<24.17 and %BF≥30% in females, while the remaining 300 males and 246 females were not obese, having 17≤BMI<23.60 and %BF<25% and 17≤BMI<24.17 and %BF<30%, respectively. For both sexes, serum total-cholesterol (TC), low-density lipoprotein cholesterol (LDLC), triglycerides and the arteriosclerotic index (AI) were significantly higher (p<0.05∼0.01) in those with masked obesity. And many of the subjects with masked obesity had abnormal levels of TC, LDLC and AI, compared with those who were not obese (p<0.05∼0.01). Additionally, we compared both serum lipid levels and the prevalence of hyperlipidemia between subjects with masked obesity and control groups with the same BMI values. As a result, subjects with masked obesity had high serum lipid levels and a prevalence of hyperlipidemia. These results support the existence of masked obesity and suggest that masked obesity is associated with increased serum lipid levels, and thus could be a risk factor for arteriosclerosis in male and female high school freshmen.

The Relationship Between Adiposity and Risk factors for Cadiovascular Disease at Normal Body Weight Male / 영남의대학술지

BACKGROUND: Most of all studies about the relation between the health risk and obesity are based on the European and American data. The purpose of this study is to examine the relation between adiposity and risk factors for cardio vacular disease (CVD) in normal weight individuals. MATERIALS AND METHODS: Normal weight subjects with a body mass index (BMI) between 18.5 and 23 kg/m2 (76 subjects) and overweight subjects with a BMI between 23 and 25 kg/m2 (53 subjects) were retained for this study. Normal weight subjects were divided into three group of each adiposity variable, then three group and the overweight group were evaluated for the presence of CVD risk factors and analyze the correlation coefficients between adiposity variables and risk factors controlled for age in normal weight, overweight groups. Using logistic regression analysis, the odds ratio (OR) for the prevalence of risk factors for each group of adiposity variables and the overweight group was estimated relative to the first group in normal weight subjects. RESULTS: Systolic BP, diastolic BP, LDL cholestrol, HDL cholesterol, triglycerides in normal weight subjects were significantly correlated with all adiposity variables (P<0.01). Third group (3.7 for %fat and 4.7 for fat mass)of adiposity variables in the normal weight group and the overweight group (6.6 for %fat and 11.5 for fat mass) tended to have higher ORs compared to first group for risk factor variables. CONCLUSION: Normal weight subjects with elevated adiposity had higher prevalence of risk factors than normal weights subjects with less adiposity. Measuring of adiposity added additional information of cardiovascular disease risk factors in normal weight subjects.

The association between dietary fat and body fat in obese adults

BACKGROUND: There are different opinions on whether the percentage of dietary fat is associated with the development of obesity and on it's treatment . In this country, dietary fat intake has been smaller compared to the Western countries. The purpose of this study was to find whether intake of dietary fat is related to percentage body fat in obese adults cross sectionally. METHODS: Nutrient intake from 24 hour dietary recall and percent body fat from bioelectrical impedance method were measured in 51 obese adults. Total energy intake was associated with intake of dietary fat and body size. Thus, the association of intake of dietary fat and three types of fat with percentage body fat were examined after adjustment for total energy intake by using 4 statistical models (standard multivariate model, and nutrient residual model, energy partition model, and multivariate nutrient density model). RESULTS: In all of these models, the results for types of fat and total fat showed similar results. Higher intake of total fat, saturated and polyunsaturated fat was associated with increased percentage body fat, while higher intake of monounsaturated fat was associated with decreased percentage body fat. CONCLUSION: We found positive association between dietary intake of fat and percentage body fat in obese adults. Our results suggest that reducing fat intake would be a helpful way to prevent and treat obesity in adults.

Effect of the bone mineral content variation on the body fat ratio computation in young adults / 体力科学

Bone mineral content (BMC), fat weight (FAT) and lean tissue weight (LTW) were determined by dual-energy X-ray absorptiometry (DEXA) in 20 young adults of both sexes who were performing habitual exercise. From these data, body weight, lean body weight (LBW) and the percentage of BMC relative to LBW (BMC%LBW) were obtained. First, body density based on a two-component model (D<SUB>2</SUB>) was calculated using the values of FAT and LBW of the subjects and the fat and lean densities of the Reference Body, Then percentage body fat (%Fat<SUB>2</SUB>) was calculated using the formula of Brozek et al. The body density for a three-component model (D<SUB>3</SUB>) was then determined from the values of FAT, BMC and LTW of the subjects, and the fat, bone mineral and lean tissue densities of the Reference Body. Percentage body fat (%Fat<SUB>3</SUB>) was also calculated in the same manner as %Fat<SUB>2</SUB>. Analysis of the data indicated that (1) females had higher values of BMC%LBW than males, and that (2) subjects whose %Fat<SUB>2</SUB> exceeded %Fat<SUB>3</SUB> by more than 1% were exclusively females whose BMC%LBW values were more than 6.1%. In contrast, those whose %Fat<SUB>2</SUB> was lower than %Fat<SUB>3</SUB> by less than -1% were exclusively males who had BMC%LBW values less than 5.2%. It is concluded that male subjects develop their muscles more than their bones with habitual exercise, which results in a lower BMC%LBW value than in females, and that for those with BMC%LBW values exceeding 6.1% (females) or less than 5.2% (males), %Fat calculation from body density using the formula of Brozek et a1. will produce an error of more than 1% if BMC%LBW is not considered.